Technical offer

8/9/2019 Technical offer

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5. Controls and Instrumentation ISA Instrument Society of America

6. Quality Assurance and Control ISO - International Standardization Organization - 9001

Table 1.0 International and local standards andpractices

No Id Description Subject Area Discipline

1 EN:809:1998pumps andpump unitsfor liquids

productsafety

common safetyrequirements

QAL

2 EN:ISO:12100:2010safety ofmachinery

productsafety

generalprinciples fordesign/risk

assesment andrisk reduction

QAL

3 EN:ISO:9001:20080qualitymanagementsystems

quality system requirements QAL

4 EN:ISO:14001:2004environmentalmanagementsystems

environmentalsystem

requirementswith guidancefor use

QAL

5 OHSAS:18001:2007

occupationalhealth andsafety

managementsystems

work safety requirements QAL

6 EN:ISO:2858:2010

end-suctioncentrifugalpumps (rating16 bar)

dimensions

designation,nominal dutypoint anddimensions

MEC

7 EN:ISO:5199:2002

technicalspecificationsforcentrifugalpumps

design class 2 MEC

8 EN:ISO:5199:2012rotodynamicpumps

testing

hydraulicperformanceacceptancetests/acceptancegrades

MEC

9 HI:14.6:2011rotodynamicpumps

testing

hydraulicperformanceacceptancetests/acceptancegrades

MEC


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No Id Description Subject Area Discipline

10 EN:10204:2004metalicproducts

testinginspectiondocument type2.2 and 3.1

MEC

11 EN:735:1995overalldimensions ofrotodynamicpumps

testing tolerances MEC

12 ISO:7005-2:1988metallicflanges

flange drillingpart2: cast ironflanges/PN10,PN16

MEC

13 ASME:B16.1:2010

grey iron pipeflanges andflangedfittings

flange drillingclass 25, 125,250

MEC

14 ASME:B16.5:2009pipe flangesand flangedfittings

flange drillingNPS 1/2 throughNPS 24/class150, 300

MEC

15 JIS:B:2220:2012steel pipeflanges

flange drilling10K, 16K, 20K,30K

MEC

16 JIS:B:2239:2004cast iron pipeflanges

flange drilling 10K, 16K MEC

17 EN:1092-1:2007flanges andtheir joints

flange drillingpart 1: steelflanges/PN10,PN16, PN25

MEC

18 EN:1092-2:1997flanges andtheir joints

flange drillingpart 2: cast ironflanges/PN10,PN16

MEC

Table 2.0 General input

No Category Value

1 System of units metric

2 Control decentralised control

3 FF Control

4 Instrument threading NPT

5 Piping standard ansi

6 Motor design codes NEMA/NEMA

7 Maximum fluid temperature 28 oC

8 Minimum fluid temperature 11 oC

9 Maximum site temperature 40 oC

10 Minimum site temperature 5 oC

11 Maximum site humidity 0.8 kg/kg

12 Maximum noise level 85 dB13 Low 1 phase voltage 220


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No Category Value

14 Low 1 voltage 415

15 Low 2 voltage 715

16 Medium voltage 6600

17 High voltage 11000

18 Voltage frequency 50

19 Instrument power supply 240

20 PLC voltage 24

21 Control air pressure 650 kPa

22 Motor overload factor 1.1

23 Pump performance ANSI tolerance 0.1

24 Piping overload capacity 1.1

25 Service life 25 years

Table 3.0 General data

No Category Proposed Requested

1 Keywords

raw water:seawater, productquality:technical, pretreatmenttype:pressure filters, energy recoverytype:ERI, mode ofoperation:continuous, intaketype:closed, seismic

zone:non_classified

2Desalinationprocess

SWRO plant of 100000 m3/day

3Plant installedcapacity (Max)

4,177.249 m3/h

4Intake feedwater maxrate

9,639.177 m3/h

5Intake feedwater salinity

0.04 kg/kg

6Intake feedwatertemperatures

11.2 oC

7Maximum brinedischarge

5,461.9 m3/h

8 Brine salinity 0.071 kg/kg

9Plantconversionratio

0.43

10 Energy supply 11000VAC


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No Category Proposed Requested

11Total installedpower

17,907 kW

12Total power

consumption

15,689 kW

13Specific powerconsumption

3.756 m3/kWh

14 plant area 22,975 sq.m

Figure 1 P&ID 112: process flow diagram

Figure 2 P&ID 111: layout


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1 Base RO cleaning tank 22 flocculant storage

2 CIP micron filter 23 flushing pumps

3 CIP pumps 24 flushing tank

4 CO2 dosing system 25 high pressure pump

5 Energy recovery system 26 intake pumps

6 SWRO membrane array 27 intake pumps

7 acid RO cleaning tank 28lime water preparation and dosingsystem

8 air blower 29 micron filters

9 air compressor system 30 neutralization tank

10 antiscalant and SMBS storage 31 polymer storage

11antoscalant and SMBS dosing

systems32 pressure filter first stage

12 auxiliary system 33 pressure filter first stage

13 auxiliary system 34 pressure filter second stage

14 backwash pumps 35 pressure filter second stage

15 backwash tank 36 product delivery pumps

16 brine dilution pumps 37 product tank

17 chlorination system 38 rotating band screens

18 chlorination system 39 screen washing pumps

19 effluent surge tank 40 sulfuric acid storage

20energy recovery system boosterpump

21flocculant and polymer dosingsystems

The plant layout provides minimum footprint and the length of interconnecting piping, clearly definesthe project areas, and meets work safety and O&M requirements. All chemical storage tanks havedirect access for trucks. Importantly, the SWRO membrane vessel ends do not overlook themaintenance areas which are mostly frequently visited.

Table 4.0 Plant components scope

No System Type ProcessStandby

capacity %

1 4.0 Intake filter main filtration 100

2 5.0 Intake pumps main pumping 100

3 5.1 Intake chlorination auxiliary chemical dosing 100

45.2 Compressed air

system

auxiliary cleaning 100

5 6.0 Filter 1 main filtration 100


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No System Type ProcessStandby

capacity %

66.1 Polymerpreparation

auxiliary chemical dosing 0

7 6.2 Polymer dosing auxiliary chemical dosing 100

86.3 Flocculant to filter1


96.4 Acid dosing beforefilter 1


106.5 Filters backwashingbackup

auxiliary backwashing 100

11 7.0 Filter 2 main filtration 100

127.1 Flocculant to filter2


137.2 Acid dosing afterstage 2


14 8.0 Swro unit main filtration 0

15 8.1 Cooling system auxiliary cooling 100

16 8.2 Antiscalant storage auxiliary storage 100

178.3 Antiscalant dosingto swro


18 8.4 Smbs storage auxiliary storage 100

19 8.5 Smbs dosing afterfilter 2


208.6 Smbs dosing toswro


21 8.7 Ro flushing system auxiliary cleaning 100

22 8.8 Cip system auxiliary cleaning 100

238.9 Brine dilutionpumps

auxiliary mixing 100

24 9.0 Product delivery main remineralization 0

25 9.1 Zinc orthophosphatdosing


26 9.2 Lime water dosing auxiliary chemical dosing 100

27 9.3 Co2 dosing auxiliary chemical dosing 100

289.4 Productchlorination


Table 5.0 Vendor-provided pre-engineered systems

No System Process type

1 soda ash dosing posttreatment auxiliary continuous process

2 CO2 dosing posttreatment main continuous process


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No System Process type

3 high pressure pump SWRO critical process

Table 6.0 Pump material vs fluid usage

No case/impellerpermeate

highquality

seawater polymer brackishwater

permeatelow

qualityCIP permeate service

waterantis

1 duplex/duplex 0 0 0 1 0 0 0 0 0

2 PVC/PVC 0 0 2 0 0 0 0 0 2

3 superduplex/superduplex 0 11 0 0 0 0 0 0 0

4 duplex/904L 0 0 0 0 0 0 0 0 0

5 titanium/titanium 0 2 0 0 0 0 0 0 0

6cast iron/cupro

aluminium

0 0 0 0 0 0 0 1 0

7 316L/316L 5 0 0 0 1 6 3 2 0

Table 7.0 Valve material vs fluid usage

No body/trimpermeate

highquality

seawater polymerpermeate

lowquality

sludge permeate brine CO2 floccula

1 PVC/PVC 10 26 0 1 0 4 0 10 0

2 Carbon steel/EPDM 0 0 0 0 7 0 0 0 0

3 duplex/duplex 0 0 0 0 0 0 2 0 0

4 superduplex/superduplex 0 55 0 0 0 1 17 0 0

5stainless steel316L/stainless steel 316L

6 0 0 7 0 5 0 2 0

6 PP/EPDM 0 0 0 0 0 0 0 0 0

7EPDM lined ductileiron/superduplex

0 42 0 0 0 0 24 0 0

8EPDM lined ductileiron/stainless steel 316L

17 0 0 3 0 25 0 0 0

9 PVC/EPDM 0 0 36 0 0 0 0 0 28

10EPDM lined ductileiron/ebonite linedstainless steel 316L

0 0 0 0 0 4 0 0 0

11 254 smo/254 smo 0 2 0 0 0 0 2 0 0

12 PP/PP 8 19 3 0 0 5 9 0 3

Table 8.0 Piping material vs fluid usage

No pipingpermeate

highquality


lowquality

sludge permeate brine CO2 flocculant SMBSo

1 zeron 100 0 27 0 0 0 0 19 0 0 0 0


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No pipingpermeate

highquality


lowquality

sludge permeate brine CO2 flocculant SMBSo

2 ductile iron 0 0 0 0 0 0 0 0 0 0 0

3 high densitypolyethylene 0 4 0 0 0 1 0 0 0 0 0

4stainless steel316

1 0 0 2 0 0 0 0 0 0 0

5 duplex 1.4462 0 0 0 0 0 0 2 0 0 0 0

6fiberglassreinforcedpolyester

8 17 0 3 0 13 20 0 0 0 0

7 polyethylene 1 5 25 0 0 0 0 4 17 33 8

8

galvanized

iron 1 0 0 0 0 0 0 0 0 0 0

9 carbon steel 0 0 0 0 0 0 0 0 0 0 0

10 polypropylene 31 31 0 9 8 27 12 0 4 4 0

Table 9.0 Piping material vs fluid velocity

NoFluid pressure,

kPaFluid velocity,

m/s

1 zeron 100 7014 5.1085

2 ductile iron 130 0.006288

3 high density polyethylene 1516 4.0325

4 duplex 1.4462 3258 3.6567

5 stainless steel 316 1874 27.971

6 galvanized iron 1874 3.5689

7 polyethylene 800 23.21

8fiberglass reinforcedpolyester

775 3.534

9 carbon steel 700 54.743

10 polypropylene 775 35.774


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Figure 3 P&ID 121: intake pumps

This P&ID shows the seawater intake implementation. It includes 2 rotating band screens, each beingdesigned for the 100% flow rate. Both screens are pull-out design and may be isolated with the stoplogs. The pull-out design is at least as twice expensive as the conventional one, but provides mush

higher reliability especially for seismic areas. The last factor is taken into account in selecting thescreens' cleaning system; it includes the stand-alone vertical turbine pumps more expensive solutioncomparing to the pumps fed by the seawater from the intake main pumps, and the debris disposalsystem. The first system cleans the screens by high-velocity jets produced in specially designednozzles.

The requested pumping turn-down ratio and spare (standby and rotating) capacity are provided with anumber of pumps connected in parallel, each pump being driven by the variable speed drive (VSD). Inaddition the intake station is equipped with the brine dilutionpumps. Such a solution provides thestable quality of dilutionregardless of the brine output rate as compared to the passive dilution byevenly distributed brine jets along the brine outfall piping.

Ancillaries include the pigging system, the chlorination system, and the compressed air one. Pigging isa batch process which is started every time the water level in the sump approaches the minimumsubmergence for the main pumps. The chlorination subsystem is simple and rugged in design as it isused only on rare occasions. The shock-chlorination dosing rates are monitored at the stationdischarge manifold. The compressed air is fed to the intake head to build the bubble screen thatshould scare away fish. The last subsystem is the sacrificial-anode protection of the screens and themain pumps against corrosion (not shown on P&ID). The quality characterisrics of the intake water isfully monitored and

recorded.

Intake Pumping Station


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The seawater intake pumping station is located on the facility site. It is of circular design, which,comparing to the rectangular structure, provides better construction strength and stability. The use ofreinforced concrete with special additives against seawater corrosion, and a final epoxy film coatingwill ensure a better resistance under stringent seawater conditions. The pit structure is covered by aconcrete slab roof on which the vertical intake pumps is to be installed.The intake design and arrangement are based on a number of vertical pumps operating in parallel.

This solution provides required operation flexibility and reliability. The number of pumps in operationwill vary according to the plant load. The pumps are to be housed in a light building for their climateprotection and noise isolation. The building is to be equipped with a proper ventilation system tocontrol the temperature of the pump electrical motors.

Table 10.0 Intake filter

No Category Value

1 Process to filter seawater before pumping

2 Service main continuous process

3 Startup fully automated

4 Fluid/Capacity seawater/9639m3/h

5 Turndown ratio 10

6 Standby capacity 100 %

7 Operating reserve capacity 50 %

8 Power load 46 kW

Table 10.0.1 Intake rotating band screen

No Category Value

1 Dwg/Tag 121/RSC-02-121

2 Quantity 2

3 Fluid seawater

4 Type & Servicecentral flow rotary screen filter,continuous with self cleaning

5 Manufacturer -

6 Manufacturer Code -

7Design flow rate,

m3/h

9639

8Low water depth(submergence), m

1.4

9Screen face velocity,m/s (clean)

0.3

10Effective screenwidth, m (not lessthan)

3.19

11Total filtration area,m2 (not less than)

8.9

12 Mesh size, mm 19.0 x 19.0


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No Category Value

13Spray fluidrequirement, m3/h

22.3

14 Motor description rotating band screen drive

15 Dwg/Tag 121/AMF-4-1-02-121

16 Quantity 2

17 Type and enclosure

continuous, totally enclosed nonventilated, 1, temperature rise &insulation class F/B, horizontal foot-mounted termbox top (IMB3)

18 Manufacturer -


20 Power supply 415V/3ph

21 Power rating, kW 4

22 Speed (rpm) 1500

23Efficiency @ designpoint, %

93.056

24 Starting method variable speed drive

Table 10.0.2 Rotating band screen washing pump

No Category Value

1 Dwg/Tag 121/PCV-03-121

2 Quantity 2

3 Fluid seawater

4 Design flow rate, m3/h 52

5 Differential head, m 50

6 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.459

9 Load, kW 15.9

10 Manufacturer -


12 Type vertical turbine

13 Construction materials

14 casing superduplex

15 impeller superduplex

16 ANSI rating #150

17 Seals packing gland

18 Driver variable speed drive


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14/125

No Category Value

vertical large-flange-mounted termbox top(IMV1)

4 Manufacturer -

5 ManufacturerCode

-



8 Speed (rpm) 992

9Efficiency @design point, %

96


Table 11.0.3 Intake pump motor vsdNo Category Value

1 Dwg/Tag 121/VSDP-01-121

2 Quantity 5

3 Type continuous, light overload, IP54, VSI-PWM

4 Manufacturer -




Product Water Chlorination

The product water chlorination system includes a dosing pump and a tank which are used to providechlorine residual in the product water. Because product water is pure, there is little chlorine demandwhich allows for small dosing systems to easily provide the residual chlorine. The dosing rates aredetermined by field testing and are influenced by plant capacity and chemical concentration. Whilethere are other methods for dosing chlorine, Pimansoft recommends using sodium hypochloritebecause it is easy to use and relatively safe compared to other types of chlorine systems. Hypochloritesolutions contain typically 12.5% available chlorine and are supplied in drums. There are no mixingrequirements. Pimansoft can provide further information on other dosing systems if necessary.As with all chemical systems, operations staff should be trained on how to handle these chemicals.Safety gear such as eyewash and shower stations, gloves, masks, aprons, eyewear and spill controlproducts are not included in the Dosing System and should be supplied by the customer. Because mostchemical injuries occur during handling and transfer, site layout and handling issues are importantconsiderations. In their concentrated form, the dosing chemicals are toxic and can cause burns andinjury.

Table 11.1 Intake chlorination

No Category Value

1 Process to chlorinate intake piping and sump

2 Service auxiliary batch process


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No Category Value

3 Startup semi-automated

4 Fluid/Capacity sodium hypochlorite/0.1975m3/h

5 Turndown ratio 5



8 Power load 0 kW

Table 11.1.1 Chlorination dosing pump

No Category Value

1 Dwg/Tag 121/PDA-01-121

2 Manufacturer -

3 Manufacturer Code -4 Quantity 1

5 Fluid sodium hypochlorite

6 Service batch

7 Pump typehydraulically actuateddiaphragm

8 Drive type ac motor

9 Capacity adjustment method manual

10 Head/Diaphragm material stainless steel 316/hypalon

11 Min/Max flow rates, l/min 1.013/5.064

12 Maximum discharge pressure, Barg 2

13 Capacity adjustment precision 0.1

14 Starting conditions flooded

15 Minimum rotation speed, rpm 500

16 Maximum rotation speed, rpm 1000

17Manual stroke length variationrange, %

10 - 100%

18 Frequency 50

19 Voltage 220V/3ph

20 Nominal size, kW 0.75

21 Shaft speed, rpm 998

Table 11.1.2 Chlorination storage

No Category Value

1 Dwg/Tag 121/SU-3.5-HCL-02-121

2 Quantity 13 Type & Design batch, open tank, surge


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No Category Value

4 Manufacturer -


6 Material fiberglass reinforced polyester

7 Total Volume, m3 3.5

8 Operating Volume, m3 3

9 Overall dimensions, m [LxWxH] 2.75/2.75/2.75

10 Outside diameter, mm 2750

11 Height, mm 2750

12 Spill berm no

13 Drainage, inch 0.04

14 Fluid sodium hypochlorite

15 Design flow rate, m3/h 0.1975

Table 11.2 Compressed air system

No Category Value

1 Process to supply air to intake head



4 Fluid/Capacity air/20.8814m3/h

5 Turndown ratio 2



8 Power load 15 kW

Table 11.2.1 Intake sump

No Category Value

1 Dwg/Tag 121/WIN-1450-SW-03-121

2 Quantity 1

3 Type & Designcontinuous, open tank, waterintake

4 Manufacturer -


6 Material concrete

7 Total Volume, m3 1450


9Overall dimensions, m

[LxWxH]

6/6/6



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No Category Value

11 Height, mm 6000

12 Spill berm no


14 Fluid seawater


Table 11.2.2 Intake cleaning

No Category Value

1 Dwg/Tag 121/ARS-01-121

2 Quantity 1

3 Fluid air

4 Type & Service rotary screw type, batch5 Manufacturer -


7 Inlet air flow rate (delivery), Nm3/h 154

8 Rated delivery, Nm3/h 169

9 Discharge pressure, Barg 7

10 Discharge temperature, oC 336

11 Power consumpition, kW 15

12 Rotation speed, RPM 1500

13 Blower type rotary screw type

14 Drive connection type gear driven

15 Auxiliaries

Pretreatment System

The pretreatment system is the most important part of the plant. This system allows the membranesto perform according to the design. Where the pretreatment system does not work properly, themembrane system will require excessive chemical cleaning, which results in downtime and poor

operation. The pretreatment system should be conservatively designed. Projenex offers threefiltration options which can be used separately or in conjunction depending on the client

s incomingseawater quality.


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Figure 4 P&ID 131: chemical dosing and first stage filtration

The selected standard fine filtration process and implementation match the target SDI of 3.5 foroutput. Pretreatment includes 2 identical stages of multi-media filtration in the horizontal filter

vessels designed for pressure as high as 10 Barg. Before the 1st stage sulphuric acid, polymer andflocculent are admixed to seawater. Before the 2nd stage flocculant is added again. After thefiltration there is an option to add the sulphuric acid and SMBS.

This type of filter requires periodical backwashing as the build-up of the filtrated material graduallyplugs it. The selected backwashing system does not cause any dips in the plant production during itsoperation. The said system contains an open tank with the three low-head pump, and the air scouringsystem. The tank is continuously filled with the brine rejected from the reverse osmosis process or thefiltrated water. After backwashing the filter goes through maturing phase during which the filtratedwater quality returns to the normal one. This water flow is diverted and fed again to the filters. Thefiltration quality is periodically checked through water sampling to SDI- monitoring system. Freechlorine, turbidity and pH are monitored as well.

Dual Media Filtration

The dual media filtration system, often called a sand filter, consists of various layers of sand andgarnet and has been designed to operate at conservative flux rates.The sand filter requires periodic backwashing to remove trapped particles.The media filtration system consists of dual media open concrete filters, each with an effective flowarea sized so that the feedwater flowrate produces a flux of 8 - 15 m/hour. During the backwashcycle, the flux will increase to 30 m/hour.The filtered water outlet valve controls the filtration velocity. The velocity depends on the watersupply to the filter, or in other words, the inlet flow versus the number of filters online.


19/125

Figure 5 P&ID 132: second stage filtration and backwashing

Filtering Media Backwash System

Filtering media backwash is necessary either after the filter has been in operation for a certain

predetermined period of time (the default is 48 hours) or when the filter is blocked, the earlier of thetwo. (If the water quality is good the operator can extend the 48 hour default time set for backwash,up to 92 hours. Period-to-backwash should not exceed 92 hours.) The backwash system consists of thefollowing equipment.The filtering media backwash system shall consist of a backwash pump, backwash sump (or tank) andvarious valves and piping. The backwash sump should be sized for a volume that can provide at least15 minutes of flow, but preferably more. The larger the sump volume, the more backwashing timethat is available for cleaning the media filters. Where multiple RO systems are installed, the backwashtank can be sized smaller since it can be filled from the other operating systems during backwash.Although many designs use product water for backwash, it is not necessary. Brine can be used for thispurpose as well as long as the media filter is flushed with seawater before bringing back online.The backwash operation is automated. This is a simple operation and allows for slow opening andclosing of valves and operator feel for the system. This can be automated with automatic valves,timers etc., but at unnecessary expense and complexity. The system is equipped with differentialpressure switches and indicators, which are wired to the control system, to allow for systemmonitoring.

Backwash Tank

The following briefly describes the steps of the backwash procedure.

1.

Draining: The water level inside the filter is minimized to meet the right conditions for air-scouring.

2.

Air-scouring: The blower pushes air through the filter to loosen the filter media.

3.

Combined wash: After a set period of time the air flow is combined with water to scrub thesludge loose from the filter media.


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4.

Water wash: After a set period of time the blower is stopped and the procedure continues withonly water to rinse out the sludge.

After backwash, as the media itself is clean, its ability to trap suspended solids is reduced, andtherefore the quality of the first filtration period is not good enough to be sent to the filtered watertank. The backwash is followed by a stateeeeeeeeeeeee in which this first low quality water ispumped back towards the main feed channel. In the event that the rinsing pumps are not active or areout of order, this water flows to the backwash collection tank. From the backwash collection tank thewater is evacuated, with a controlled flow, towards the brine outfall.The backwash tank is filled from the clear water tanks of both pretreatment systems, using thebackwash tank filling pump (one per each plant). Backwash can be performed on only one filter at atime. In the event that backwash is required for more than one filter, it will be performedsequentially. During backwashing air and/or water is forced through the filter in the oppositedirection, thereby washing out the total suspended solids (TSS) that remained on the filter media.

Table 12.0 Filter 1

No Category Value

1 Processto filter seawater through multi-mediastage 1

2 Service critical process



5 Turndown ratio 2


7Operating reserve

capacity10 %

8 Power load 290 kW

Table 12.0.1 Feed to first filter

No Category Value

1 Dwg/Tag 131/BPF-01-131

2 Quantity 16

3 Manufacturer -


5 Type & Design pressure filter

6 Flow rate, m3/h 639

7 Operating Pressure, Barg 6.6

8 Pressure rating ANSI #150

9 Connection size, inch 20/20

10 Filtration rating, (microns) 20

11 Filtration velocity, m/hour 20

12 Total filtration area, m2 32

13 Cartridge element quantity 127


21/125

Table 12.1 Polymer preparation

No Category Value

1 Process to prepare polymer

2 Service main batch process


4 Fluid/Capacity polymer/0.1319m3/h

5 Turndown ratio 1



8 Power load 2 kW

Table 12.1.1 Polymer dilution

No Category Value

1 Dwg/Tag 131/MXD-01-131

2 Quantity 2

3 Fluid polymer

4 Service & Function batch, dissolve

5 Agitator type high intensity

6 Agitator mounting top

7 Manufacturer -



10 Gear ratio 10

11 Impeller maximum rotation speed, rpm 100

12 Impeller diameter, mm 600

13 Maximum impeller tip speed, m/s 3.1

14 Drive type AC motor

15 Enclosure totally enclosed air over

16 Temp. rise/Insulation Class F/B

17 Starting DOL

18 Frequency 50

19 Voltage 220V/3ph


21 Speed, rpm 1500

Table 12.1.2 Polymer dilution

No Category Value

1 Dwg/Tag 131/SU-3.5-PMR-02-131


22/125

No Category Value

2 Quantity 2

3 Type & Design batch, open tank, surge

4 Manufacturer -







11 Height, mm 2750

12 Spill berm no


14 Fluid polymer


Dosing System Design

The following is a general outline covering typical metering pump applications, and the accessoryitems for the optimum control and enhanced performance.The chemical tank is ether used to store chemicals or blend chemicals. A strainer on the suction feed

line should always be installed, periodically checked and cleaned. Isolation valves are provided onboth suction and discharge of the strainer for ease of maintenance. They are the ball type, large port,quick opening valves. The ball valve has a generous opening and is easily stroked from full closed tofull open position. A needle valve would not be an acceptable suction valve as the port design wouldcause a restriction. It is also required in conjunction with the calibration cylinder to isolate thechemical tank. Calibration cylinder provides an simple way to periodically check the performance andaccuracy of your metering pump. Calibration cylinder is equipped with isolation valves. When runninga calibration the discharge valve is opened and the suction valve is closed. When in normal operationthe valves position is the opposite.A bottle type suction pulsation damper may be required in some installations where the suction pipingis long or has many bends, this is because metering pumps do not work well against vacuumconditions. The damper will shave the sudden drops in the suction pressure due to the effect of the

fluid acceleration and, thus keeping the pump rating constant. To refill the damper, the air releasevalve shall be installed atop the damper.To avoid the pump overloading in the emergency situations when the discharge line is isolated, it isequipped with the inline pressure relief valve with the outlet connected to the storage tank. For easymaintenance the pump suction is equipped with the drain and isolation valves.When remote or automatic control of the pump is required the dosing pumps is fitted with a strokelength actuator, this can either be pneumatic or electrically actuated. The control signal is4....20mAmp, pulse, or profibus.The pressure gauge installed on the discharge line is the quickest way to check whether the meteringpump is operating correctly. This value must not exceed the maximum allowable pressure of thepump.The back pressure valves is installed in the discharge piping of the pump to ensure a constant pressurefor the discharge check assembly to work under. This allows for the repeatability of a constant fluiddischarge per stroke, and accuracy desired. Additionally, constant back pressure provides constantfluid discharge per stroke and anti-siphon protection.


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In cases when the constant mass flow rate is required (as opposed to the constant volumetric rate)metering pumps are equipped with a flowmeter. When using a flowmeter a pulsation damper isgenerally required to ensure a smooth measurable flow.A check valve, normally spring loaded, is used coupled to the isolation valve, to isolate the dischargechemical line from the process line.

Table 12.2 Polymer dosing

No Category Value

1 Process to dose polymer



4 Fluid/Capacity polymer/0.0468m3/h

5 Turndown ratio 5

6 Standby capacity 100 %7 Operating reserve capacity 0 %

8 Power load 0 kW

Table 12.2.1 Polymer dosing pump

No Category Value

1 Dwg/Tag 131/PDA-01-131

2 Manufacturer -


4 Quantity 2

5 Fluid polymer

6 Service batch





11 Min/Max flow rates, l/min 1.091/5.45512 Maximum discharge pressure, Barg 2






10 - 100%

18 Frequency 50

19 Voltage 220V/3ph


24/125

No Category Value



Table 12.3 Flocculant to filter 1

No Category Value

1 Process to dose flocculant to filter 1



4 Fluid/Capacity flocculant/0.0638m3/h

5 Turndown ratio 5


7 Operating reserve capacity 0 %8 Power load 0 kW

Table 12.3.1 Flocculant dosing pump

No Category Value

1 Dwg/Tag 131/PDA-02-131

2 Manufacturer -


4 Quantity 2

5 Fluid flocculant

6 Service batch












10 - 100%

18 Frequency 50

19 Voltage 220V/3ph20 Nominal size, kW 0.75


25/125

No Category Value


Table 12.3.2 Flocculant storage

No Category Value

1 Dwg/Tag 131/SU-3.5-FLCNT-05-131

2 Quantity 1


4 Manufacturer -




8 Operating Volume, m3 39 Overall dimensions, m [LxWxH] 2.75/2.75/2.75


11 Height, mm 2750

12 Spill berm no


14 Fluid flocculant


Table 12.4 Acid dosing before filter 1No Category Value

1 Process to dose sulphuric acid to stage 1



4 Fluid/Capacity 97% H2SO4/0.049m3/h

5 Turndown ratio 5



8 Power load 0 kW


No Category Value

1 Dwg/Tag 131/SMX-01-131

2 Quantity 1

3 Fluid seawater

4 Type & Service static mixer, continuous

5 Manufacturer -


26/125

No Category Value


7 Flow rate (delivery), Nm3/h 9639

8 Allowable pressure drop, kPa 20

9 Connection size, inch 48

10 Housing length, m 0

11 Connection points 0

12 Injector points 1

13 Injected fluids 97% H2SO4


Table 12.4.2 Sulphuric acid pump

No Category Value1 Dwg/Tag 131/PDA-05-131

2 Manufacturer -


4 Quantity 2

5 Fluid 97% H2SO4

6 Service continuous

7 Pump type mechanical diaphragm


9 Capacity adjustment method automatic

10 Head/Diaphragm materialstainless steel316/hypalon





15 Minimum rotation speed, rpm 75016 Maximum rotation speed, rpm 1500

17Manual stroke length variation range,%

10 - 100%

18 Frequency 50

19 Voltage 220V/3ph



Table 12.5 Filters backwashing backup


27/125

No Category Value

1 Process to backup filters backwashing



4 Fluid/Capacity brine/2390m3/h

5 Turndown ratio 1.3



8 Power load 161 kW

Table 12.5.1 Backwash tank

No Category Value

1 Dwg/Tag 132/SU-800-BR-01-1322 Quantity 1


4 Manufacturer -


6 Material concrete



9 Overall dimensions, m [LxWxH] 6/6/6


11 Height, mm 6000

12 Spill berm no


14 Fluid brine


Table 12.5.2 Backwash pump

No Category Value

1 Dwg/Tag 132/PCB-02-132

2 Quantity 1

3 Fluid brine



6 NPSHr, m 12

7 speed,RPM 993

8 Efficiency 0.823


28/125

No Category Value

9 Load, kW 145.9

10 Manufacturer -


12 Type between bearings




16 ANSI rating #150

17 Seals balanced

18 Driver ac motor

Table 12.5.3 Backwash pump motorNo Category Value

1 Dwg/Tag 132/AMP-160-0-02-132

2 Quantity 1

3Type andenclosure

batch, totally enclosed air over, 12,temperature rise & insulation class F/B,horizontal foot-mounted termbox top (IMB3)

4 Manufacturer -

5Manufacturer

Code

-



8 Speed (rpm) 993


96

10 Starting method direct on line

Table 12.5.4 Backwash pump motor

No Category Value1 Dwg/Tag 132/SSL-02-132

2 Quantity 1

3 Type batch, IP31

4 Manufacturer -




Table 13.0 Filter 2


29/125

No Category Value

1 Processto filter seawater through multi-mediastage 2




5 Turndown ratio 2


7Operating reservecapacity

10 %

8 Power load 292 kW


No Category Value

1 Dwg/Tag 132/BPF-04-132

2 Quantity 16

3 Manufacturer -


5 Type & Design pressure filter







12 Total filtration area, m2 32


Table 13.1 Flocculant to filter 2

No Category Value

1 Process to dose flocculant to filter 2



4 Fluid/Capacity flocculant/0.03191m3/h

5 Turndown ratio 5



8 Power load 0 kW

Table 13.1.1 Flocculant dosing pump


30/125

No Category Value

1 Dwg/Tag 131/PDA-03-131

2 Manufacturer -


4 Quantity 2

5 Fluid flocculant

6 Service batch












10 - 100%

18 Frequency 50

19 Voltage 220V/3ph



Table 13.2 Acid dosing after stage 2

No Category Value

1 Process to dose sulphuric acid after stage 2



4 Fluid/Capacity 97% H2SO4/0.049m3/h

5 Turndown ratio 5



8 Power load 0 kW

Table 13.2.1 Sulphuric acid pump

No Category Value1 Dwg/Tag 131/PDA-04-131


31/125

No Category Value

2 Manufacturer -


4 Quantity 2

5 Fluid 97% H2SO4

6 Service continuous

7 Pump type mechanical diaphragm


9 Capacity adjustment method automatic

10 Head/Diaphragm materialstainless steel316/hypalon







17Manual stroke length variation range,%

10 - 100%

18 Frequency 50

19 Voltage 220V/3ph



Micron Filtration

The micron filtration system consists of a micron filter housing manufactured of nonmetallic materialswhich holds the filter cartridges. This housing is inert in seawater and is rated for a flow capacity of[*]. The filter is equipped with a differential pressure switch to warn that elements need changing bythe operation team, generally within a period of two months.

The need to replace the cartridges is set according to the differential head on the filters, not higherthan 2 bar differential head. Cartridges are replaced manually, cell by cell. Refer to the operationmanual for further details on this manual procedure.The seawater reverse osmosis membranes require 5 micron polishing filtration. This is necessary tocatch any debris or sand that might escape the media filters. The 5 micron filter housings aresummarized below.These filter housings utilize 2.5 spun polypropylene filters which are each 40 long. The housings arelocated on the suction of each high pressure pump. The housings have a maximum pressuredifferential of 15 psig.This system pre-cleans the raw clean water so that it is suitable for the reverse osmosis membranes.They require the silt density index be below 5.0 and ideally below 3.0. This can be achieved throughcareful filtration. It should be noted that membranes can tolerate 0.0 mg/l oil in the feed water. If oil

is present, then additional coalescing filtration may be necessary.


32/125

Figure 6 P&ID 142: high pressure pumps and energy-recovery system

The SWRO unit is of conventional design built round ERI PX300 energy recovery device. As shown onP&ID after the feed water goes through the micron filter, antiscalant and SMBS are admixed to it.After the static mixer the sample is taken to the SDI analyzer. To decrease the risk of SWROmembrane fouling via scaling formation, the antiscalant is constantly added to seawater streams.During the intake chlorination, the free chlorine control is engaged, injecting SMBS into seawater if

needed. Then the feed is split into 2 streams; one goes to ERD, where the stream pressure raised, andthe second to the high pressure pump (HPP). After ERD the feed pressure is further increased in theERD booster pump. The said streams are entered into the membrane vessel array from the oppositesides.

The pressure of the feed after the micron filter should be higher than the NPSHR value for HPP. Thelatter is equipped with VSD variable speed drive to accommodate for the variations in the seawatertemperature and salinity and the train load. The HPP motor is selected water-cooled to decrease thenoise level. This high-fidelity system is shown in the bottom-left corner of P&ID. As well the CIP close-looped line connections are shown on P&ID. The product connection additionally contains the non-return valve protection against the inadvertent CIP in-leakage from the return piping. Rupture discsare installed on the product line and the suction line of the HPP to protect against the pressure surges

during transient operation startups and shutdowns. Another feature is the pressure-equalizing lineconnecting the product line to the feed one.

Membrane Vessel Frame

The membrane vessel frame consists of A6 Structural Steel blasted white and painted with 12 mils ofcoal tar epoxy. The structural frame is seam welded and designed with particular attention tocorrosion resistance and ease of the membrane vessel alignment. Details such as sloping surfaces andclosed box sections, nonperforated tubing sections, full seam welding, as well as the recommendedinstallation arrangement are intended to enhance the corrosion resistance of the frame.


33/125

Membrane Pressure Vessels

The membrane pressure vessels utilized in the membrane module are designed to hold eightmembrane elements and are manufactured according to ASTM pressure vessel specifications. Thesevessels are of fiberglass reinforced filament wound design and have become standard in desalination

plant design and are rated for seawater service, or 1000 psig. Each vessel shall house standard 8

x 40

membrane elements and includes inter and end connectors as well as thrust rings. Product ports are ofPVC. The Membrane Module is configured so that air can be easily purged from the system. Inletseawater and outlet concentrate process connections shall be oriented such that the vessel side portsform a vertical manifold. In order to assure balanced flow paths, not more than five vessels arespecified in this orientation. The inlet and outlet feed and brine nozzle sizes are within 2.5

- 3.5" andshall utilize grooved piping clamps. The membrane housing pressure vessels will be supplied with awhite gel-coat finish. Note that for each size range and salinity variation, there may be differentvessel quantities as noted on the equipment specification data sheets.

Reverse Osmosis Membranes

Each reverse osmosis membrane pressure vessel contains 6 to 8 high area seawater membranes. Thesemembranes are suitable for a wide-range of performance operating conditions and are suitable forLow, Standard and High salinity versions of each system size. The membranes are higharea 8

x 40

elements suitable for working pressures up to 1000 psi. The guaranteed water quality is less than 450mg/l for all salinity variants. In some cases the water quality will be significantly better than thisthreshold. If more precise product water quality is required, it is necessary to have a detailedseawater analysis. Note that Pimansoft can also provide systems that include further processing forvery pure water applications.

Figure 7 P&ID 143: SWRO membrane arrays

This P&ID shows SWRO membrane arrays arrangement and manifold fittings. The stack contains only12 pressure vessels in the column. Low height is needed to make connections to the piping rackpassing under the vessel arrays (see the plant layout below). As seen every membrane location is

described by row, column, and ordinal number inside the pressure vessel. This membrane address isextensively used by the membrane tracking software.


34/125

Membrane Module

A seawater reverse osmosis system is largely defined by the design of the Membrane Module. The

Membrane Module is a pre-engineered equipment skid that primarily contains the membrane pressurevessels and membrane elements along with associated piping and instruments. A specification sheet isincluded at the end of this section which details the physical characteristics of the Module such asweight, dimension, process connections and arrangement. The following information pertains to allMembrane Module designs.

Figure 8 P&ID 144: oil lubrication and instrumentation

High pressure pump forced oil lubrication system P&ID is an illustration of the equipmentmanufacturer drawing integration without re-drawing it according to the Projenex graphics standards.This lubrication system serves both the pump and the motor. For higher reliability of this system, oneoil pump is coupled to the shaft of the high pressure pump. At power supply interruption this pumpcontinues pumping oil to the bearings till the complete stoppage of the pump set. The system containsminimum amount of instrumentation as it is a major source of failure. To cool the oil, the lubricationsystem is plugged into a cooling system common for all water-cooled motors.

Table 14.0 Swro unit

No Category Value

1 Processto desalinate seawater in ROmembranes



4 Fluid/Capacity permeate/4177m3/h



35/125

No Category Value


7Operating reservecapacity

5 %

8 Power load 43276 kW

Table 14.0.1 Filtered feed to eri

No Category Value

1 Dwg/Tag 142/ERI-01-142

2 Quantity 4

3 Fluid brine/seawater

4 Type & ServiceERI pressure exchanger,continuous

5 Manufacturer -


7 Quantity in array 22

8 Brine/Feed, m3/h 1333/1397

9 High pressure manifold material zeron 100

10High pressure manifoldsize/schedule

0.3/ANSI #600

11 Low pressure manifold material fiberglass reinforced polyester

12 Low pressure manifoldsize/schedule

0.4/ANSI #150

Table 14.0.2 Ers booster pump

No Category Value

1 Dwg/Tag 142/PCO-01-142

2 Quantity 4

3 Fluid seawater


5 Differential head, m 356 NPSHr, m 665

7 speed,RPM 1487

8 Efficiency 0.842

9 Load, kW 158.2

10 Manufacturer -


12 Type overhung horizontal



36/125

No Category Value



16 ANSI rating #600

17 Seals balanced


Table 14.0.3 Ers booster pump motor vsd

No Category Value


2 Quantity 4


4 Manufacturer -5 Manufacturer Code -



Table 14.0.4 Ers booster pump motor

No Category Value

1 Dwg/Tag 142/AMP-200-2-01-142

2 Quantity 4

3Type andenclosure

continuous, totally enclosed air over, 12,temperature rise & insulation class F/B,horizontal foot-mounted termbox top (IMB3)

4 Manufacturer -

5ManufacturerCode

-



8 Speed (rpm) 1487


96


Table 14.1 Cooling system

No Category Value

1 Process to cool equipment bearings and motor



4 Fluid/Capacity service water/65m3/h


37/125

No Category Value

5 Turndown ratio 1



8 Power load 22 kW

Table 14.1.1 Coolant pump

No Category Value

1 Dwg/Tag 142/PIL-02-142

2 Quantity 2

3 Fluid service water


5 Differential head, m 256 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.615

9 Load, kW 7.4

10 Manufacturer -


12 Type vertical in-line


14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals cartridge

18 Driver ac motor

Table 14.1.2 Permeate pump

No Category Value

1 Dwg/Tag 142/PIL-03-142

2 Quantity 2

3 Fluid permeate high quality



6 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.614

9 Load, kW 7.4


38/125

No Category Value

10 Manufacturer -


12 Type vertical in-line


14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals cartridge

18 Driver ac motor

Table 14.1.3 Coolant surge tank

No Category Value1 Dwg/Tag 142/SU-9-SRW-01-142

2 Quantity 1

3 Type & Design continuous, open tank, surge

4 Manufacturer -







11 Height, mm 2378

12 Spill berm no





39/125

Figure 9 P&ID 141: chemical dosing

This P&ID shows the antiscalant and SMBS daily storage and dosing systems. Such an implementation issafe and simple in maintenance: batch recharging of the dosing systems is quick and fully automatic.Each SWRO train contains its own dosing system with the 100% redundancy. The dosing system has ameans to check the metering pump calibration (measuring bucket and/or mass-meter).The bottom-left corner SMBS dosing system serves the second-stage filters. The storage system is common for allSWRO units.

Feedwater Anti-Scalant

Anti-scalants are used to reduce the formation of scaling buildup in the RO membranes. Scaling is thedeposition or formation of hard deposits on the membrane surface. When this occurs, membranereplacement may be required. Scaling potential increases as the salinity of the water increases or asthe conversion increases. Because scaling is detrimental to performance of the system, anti-scalantchemicals are often added to the seawater as a preventative measure. Typically, they are added afterthe pretreatment system, but before the high pressure pump. The dosing rates are determined by thefeed flow, salinity of the feed water and conversion of the system. For the most accurate dosing rate

calculation, it is necessary to have a feed water chemistry analysis completed and submitted toProjenex for evaluation. If the analysis is not available, a dosing rate of 2 ppm in the feed water isusually sufficient.

Table 14.2 Antiscalant storage

No Category Value

1 Process to store antiscalant



4 Fluid/Capacity antiscalant/2.291m3/h


40/125

No Category Value

5 Turndown ratio 1



8 Power load 1 kW

Table 14.2.1 Antiscalant storage

No Category Value

1 Dwg/Tag 141/SU-13-ASL-01-141

2 Quantity 1

3 Type & Designbatch, open tank, with spill berm,vertical, top cone, surge

4 Manufacturer -





9Overall dimensions, m[LxWxH]

2/2/4


11 Height, mm 4000

12 Spill berm yes


14 Fluid antiscalant


Table 14.2.2 Antiscalant transfer pump

No Category Value

1 Dwg/Tag 141/PCO-01-141

2 Quantity 2

3 Fluid antiscalant



6 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.129

9 Load, kW 0.5



41/125

No Category Value



14 casing PVC

15 impeller PVC

16 ANSI rating #0

17 Seals cartridge

18 Driver ac motor

Table 14.3 Antiscalant dosing to swro

No Category Value

1 Process to dose antiscalant

2 Service main continuous process3 Startup fully automated

4 Fluid/Capacity antiscalant/0.001833m3/h

5 Turndown ratio 5



8 Power load 9 kW

Table 14.3.1 Antiscalant storage

No Category Value

1 Dwg/Tag 141/SU-1.7-ASL-03-141

2 Quantity 4


4 Manufacturer -




8 Operating Volume, m3 1.5



11 Height, mm 1320

12 Spill berm no


14 Fluid antiscalant


Table 14.4 Smbs storage


42/125

No Category Value

1 Process to store SMBS



4 Fluid/Capacity SMBS/1.733m3/h

5 Turndown ratio 1



8 Power load 1 kW

Table 14.4.1 Smbs storage

No Category Value

1 Dwg/Tag 141/SU-13-SMBS-04-1412 Quantity 1

3 Type & Designbatch, open tank, with spill berm,vertical, top cone, surge

4 Manufacturer -





9Overall dimensions, m[LxWxH]

2/2/4


11 Height, mm 4000

12 Spill berm yes


14 Fluid SMBS


Table 14.4.2 Smbs transfer pump

No Category Value

1 Dwg/Tag 141/PCO-02-141

2 Quantity 2

3 Fluid SMBS



6 NPSHr, m 107 speed,RPM 1500


43/125

No Category Value

8 Efficiency 0.08

9 Load, kW 0.6

10 Manufacturer -




14 casing PVC

15 impeller PVC

16 ANSI rating #0

17 Seals cartridge

18 Driver ac motor

Table 14.5 Smbs dosing after filter 2

No Category Value

1 Process to dose SMBS after filter 2




5 Turndown ratio 5



8 Power load 1 kW


No Category Value

1 Dwg/Tag 141/SU-1.7-SMBS-07-141

2 Quantity 1


4 Manufacturer -







11 Height, mm 1320

12 Spill berm no


44/125

No Category Value


14 Fluid SMBS


Table 14.6 Smbs dosing to swro

No Category Value

1 Process to dose SMBS to SWRO




5 Turndown ratio 1

6 Standby capacity 100 %7 Operating reserve capacity 20 %

8 Power load 9 kW


No Category Value

1 Dwg/Tag 141/SU-1.7-SMBS-05-141

2 Quantity 4


4 Manufacturer -







11 Height, mm 1320

12 Spill berm no


14 Fluid SMBS


Table 14.7 Ro flushing system

No Category Value

1 Process to flush RO membranes




45/125

No Category Value


5 Turndown ratio 1



8 Power load 1001 kW

Table 14.7.1 Flushing pump

No Category Value

1 Dwg/Tag 145/PCB-04-145

2 Quantity 2

3 Fluid permeate

4 Design flow rate, m3/h 19815 Differential head, m 55

6 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.862

9 Load, kW 352.8

10 Manufacturer -


12 Type between bearings, closed impeller


14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals balanced

18 Driver ac motor

Table 14.7.2 Swro flushing tank

No Category Value

1 Dwg/Tag 145/SU-100-PW-06-145

2 Quantity 1


4 Manufacturer -






46/125

No Category Value



11 Height, mm 3000

12 Spill berm no


14 Fluid permeate


Table 14.7.3 Flushing pump motor

No Category Value

1 Dwg/Tag 145/AMP-500-0-04-145

2 Quantity 2

3Type andenclosure

batch, totally enclosed air over, 12,temperature rise & insulation class F/B,horizontal foot-mounted termbox top (IMB3)

4 Manufacturer -

5ManufacturerCode

-



8 Speed (rpm) 1500


96


Membrane Cleaning

In normal operation, the membrane in reverse osmosis elements can become fouled by mineral scale,biological matter, colloidal particles and insoluble organic constituents. As reverse osmosismembranes slowly become fouled during normal operation, it is periodically necessary to clean them.

Deposits build up on the membrane surfaces during operation until they cause loss in normalizedpermeate flow, loss of normalized salt rejection, or both. Elements should be cleaned when one ormore of the below mentioned parameters are applicable:

1.

The normalized permeate flow drops 10%2.

The normalized salt passage increases 5 - 10%3.

The normalized pressure drop (feed pressure minus concentrate pressure) increases 10 - 15%

Piping connections are provided on the membrane module for this purpose. The cleaning systemconnects manually to the membrane array on both the feed and brine side and recirculates cleaningchemicals on the saltwater side of the membranes. A typical cleaning will require the use of high andlow pH solutions which are recycled through the membrane array to remove inorganic and organic

foulants. The size of the cleaning pump is based on the number of membranes.The reverse osmosis system must be shut down during cleaning. The cleaning system contains all


47/125

necessary equipment, including pressure gauges, flowmeters, tank, pump, valves, piping (and optionalbag filter) to complete the cleaning process as prescribed by the membrane manufacturer, or as localsite conditions require. Because cleaning is a manual process, instruments are mounted to displaylocally.It should be noted that if the intake water quality is very good (as measured by Silt Density Index orSDI), cleaning will only take place periodically. If the inlet conditions are such that either biological or

inorganic fouling does occur, then cleaning will be more frequent. It is difficult to predict the numberof times per year that cleaning of the membranes will be necessary.An additional benefit of the cleaning system is that it can provide a fresh water flush of the reverseosmosis system prior to an extended downtime. This minimizes corrosion and biological growth, thusimproving long term system operation and increasing system life. The flushing procedure is similar tothe cleaning procedure, and utilizes all the same hardware, but is much simpler.The following information pertains to all Cleaning System designs.

Table 14.8 Cip system

No Category Value

1 Process to clean RO membranes



4 Fluid/Capacity CIP/1986m3/h

5 Turndown ratio 1



8 Power load 526 kW

Table 14.8.1 Micron filter

No Category Value

1 Dwg/Tag 145/CR-04-145

2 Quantity 1

3 Manufacturer -


5 Type & Design cartridge filter







12 Total filtration area, m2 99.3


Table 14.8.2 Cip pump


48/125

No Category Value

1 Dwg/Tag 145/PCB-02-145

2 Quantity 2

3 Fluid CIP



6 NPSHr, m 11

7 speed,RPM 1500

8 Efficiency 0.866

9 Load, kW 416.2

10 Manufacturer -


12 Type between bearings, open impeller


14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals balanced


Table 14.8.3 Neutralization tankNo Category Value

1 Dwg/Tag 145/SU-250-CIP-05-145

2 Quantity 1


4 Manufacturer -







11 Height, mm 3000

12 Spill berm no


14 Fluid CIP



49/125

Table 14.8.4 Cip acid ro cleaning tank

No Category Value

1 Dwg/Tag 145/SU-120-CIP-01-145

2 Quantity 1

3 Type & Design batch, open tank, vertical, surge

4 Manufacturer -






10 Outside diameter, mm 700011 Height, mm 3000

12 Spill berm no


14 Fluid CIP



No Category Value

1 Dwg/Tag 145/SU-120-CIP-03-145

2 Quantity 1

3 Type & Design batch, open tank, vertical, surge

4 Manufacturer -







11 Height, mm 3000

12 Spill berm no


14 Fluid CIP


Table 14.8.6 Cip pump motor


50/125

No Category Value

1 Dwg/Tag 145/AMP-500-0-02-145

2 Quantity 2

3 Type andenclosure

batch, totally enclosed air over, 12,

temperature rise & insulation class F/B,horizontal foot-mounted termbox top (IMB3)

4 Manufacturer -

5ManufacturerCode

-



8 Speed (rpm) 1500

9

Efficiency @

design point, % 96


Table 14.8.7 Cip pump motor vsd

No Category Value


2 Quantity 2

3 Type batch, light overload, IP54, VSI-PWM

4 Manufacturer -




Table 14.8.8 Preparation auxiliary tank

No Category Value

1 Dwg/Tag 145/MXD-01-145

2 Quantity 1

3 Fluid CIP4 Service & Function batch, dissolve

5 Agitator type high intensity, high speed


7 Manufacturer -



10 Gear ratio 10



51/125

No Category Value






17 Starting DOL

18 Frequency 50

19 Voltage 220V/3ph


21 Speed, rpm 1500

Table 14.8.9 Cip acid ro cleaning tankNo Category Value

1 Dwg/Tag 145/MXV-02-145

2 Quantity 1

3 Fluid CIP




7 Manufacturer -



10 Gear ratio 10




14 Drive type variable speed drive



17 Starting VSD

18 Frequency 50

19 Voltage 220V/3ph


21 Speed, rpm 1500



52/125

No Category Value

1 Dwg/Tag 145/MXD-03-145

2 Quantity 1

3 Fluid CIP


5 Agitator type high intensity, high speed


7 Manufacturer -



10 Gear ratio 10







17 Starting DOL

18 Frequency 50

19 Voltage 220V/3ph20 Nominal size, kW 1.1

21 Speed, rpm 1500


No Category Value

1 Dwg/Tag 145/MXV-04-145

2 Quantity 1

3 Fluid CIP




7 Manufacturer -



10 Gear ratio 10




53/125

No Category Value





17 Starting VSD

18 Frequency 50

19 Voltage 220V/3ph


21 Speed, rpm 1500

Table 14.8.12 Neutralization tank

No Category Value1 Dwg/Tag 145/MXD-05-145

2 Quantity 1

3 Fluid CIP




7 Manufacturer -



10 Gear ratio 10







17 Starting DOL

18 Frequency 50

19 Voltage 220V/3ph


21 Speed, rpm 1500

Table 14.8.13 Circulation pump inlet

No Category Value

1 Dwg/Tag 145/PCO-01-145


54/125

No Category Value

2 Quantity 1

3 Fluid CIP



6 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.188

9 Load, kW 0.8

10 Manufacturer -




14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals cartridge

18 Driver ac motor


No Category Value

1 Dwg/Tag 145/SU-4-CIP-02-145

2 Quantity 1


4 Manufacturer -







11 Height, mm 1650

12 Spill berm no


14 Fluid CIP


Table 14.8.15 Circulation pump inlet


55/125

No Category Value

1 Dwg/Tag 145/PCO-03-145

2 Quantity 1

3 Fluid CIP



6 NPSHr, m 10

7 speed,RPM 1500

8 Efficiency 0.188

9 Load, kW 0.8

10 Manufacturer -




14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals cartridge

18 Driver ac motor

Table 14.8.16 Preparation auxiliary tankNo Category Value

1 Dwg/Tag 145/SU-4-CIP-04-145

2 Quantity 1


4 Manufacturer -







11 Height, mm 1650

12 Spill berm no


14 Fluid CIP



56/125

Table 14.9 Brine dilution pumps

No Category Value

1 Process to dilute brine

2 Service auxiliary continuous process






8 Power load 631 kW

Table 14.9.1 Brine delution pump

No Category Value

1 Dwg/Tag 121/PCV-02-121

2 Quantity 2

3 Fluid seawater



6 NPSHr, m 10

7 speed,RPM 992

8 Efficiency 0.756

9 Load, kW 271

10 Manufacturer -


12 Type vertical turbine, semi_open impeller




16 ANSI rating #150

17 Seals packing gland

18 Driver ac motor

Table 14.9.2 Brine delution pump motor

No Category Value

1 Dwg/Tag 121/AMP-315-2-02-121

2 Quantity 2

3Type andenclosure

continuous, totally enclosed air over, 12,temperature rise & insulation class F/B, down-


57/125

No Category Value

vertical large-flange-mounted termbox top(IMV1)

4 Manufacturer -

5 ManufacturerCode

-



8 Speed (rpm) 992


96


Figure 10 P&ID 151: product pumping station

This P&ID describes the re-mineralization of desalted water by adding soda ash to make it more stable

and less corrosive. The process is controlled by a set of criteria such as alkalinity, hardness, pH andLSI. To make the process effective, the CO2 gas is injected into the influent. The mineral-enrichedwater stream is then discharged to the buffer tank, its volume being selected based on the residence-time criterion. This product water pH and LSI are constantly monitored.

Permeate Tank

The reverse osmosis train product is collected through the main header, into the permeate tank. Thepermeate tank also provides neccessary suck back volume of water during emergency plant shut down.

This same permeate tank also supplies the water volume required for scheduled cleaning and flushingof the RO trains.


58/125

Product Water Re-mineralization

The reverse osmosis process is very efficient at removing minerals such as calcium and magnesiumfrom seawater. This leaves the resulting product water quite aggressive. If this is not corrected, thewater will try to dissolve materials that it comes into contact with, such as metallic and concrete-

based materials used in storage tanks and distribution piping. This can degrade not only the productwater quality but also the distribution infrastructure. To prevent this, minerals are added back intothe product water prior to distribution through a process called re-mineralization. Calcium Carbonate(CaCO3) is the material of choice for this purpose as it is readily available, reasonably inexpensive,and non-toxic. The most commonly used form of Calcium Carbonate is Calcite, which is a naturallyoccurring form of limestone.The product water is brought into contact with calcite in a calcite reactor, which is simply a closedtank with inlet and outlet pipe connections, made of fiberglass reinforced plastic, filled with crushedcalcite chips. Given enough time, the water would naturally absorb enough calcium carbonate tobecome safely neutralized. However, this would require an enormous tank, since the reaction is stillquite slow at typical product water pH levels. To increase the reaction rate, acid is added to thewater prior to the calcite reactor. To minimize cost and space requirements, 30 to 50% of the totalflow is bypassed around the reactor then recombined with the treated water.Sulfuric acid (H2SO4) works well for this application as it is inexpensive, readily available, effective,and non toxic once neutralized. It is a strong acid, so only a small amount needs to be added toachieve the desired pH, and the effect on TDS is minimized. As with any dangerous chemical, properprecautions must be used when handling and storing sulfuric acid to ensure worker safety.A mixing/dispensing tank is used to store the acid which is diluted to the appropriate level. Ametering pump injects a fixed amount of diluted acid directly into the product water line immediatelyupstream of the calcite reactor. The pump flowrate is manually adjusted to achieve the targethardness and alkalinity levels for the delivered product water. Once the setting is fine tuned, noongoing adjustments are necessary. The metering pump is controlled in unison with each reverseosmosis system, so they turn on and off together.Due to impurities and non-uniform flow patterns, the calcite bed does not dissolve evenly, and aftersome time, channels can form in the bed. This reduces the amount of calcium carbonate that can be

dissolved at a given flowrate and pH. To minimize this effect, the bed should be periodicallybackflushed at high flowrate to break up channels and blockages and reseat the bed. This can be donemanually or by closing the bypass valve and momentarily passing the full product flow through thereactor. Additional calcite material is also added periodically, keeping the bed depth roughlyconstant, insuring consistent final water quality.

Product Transfer

Depending on the local site layout, a product transfer system may be necessary to convey productwater from the reverse osmosis desalination system to the client s distribution point, where the clientwill provide a process flange to which the product piping will connect. The pressure required at this

distribution point is driven by what is downstream, specifically, the size and length of any transferpiping, the height of any storage vessels, any changes in elevation and the specific requirements ofthe distribution network. The product transfer system consists of a pump set, valving, product flowinstrumentation and product surge tank. The standard product transfer pump delivers water to thedistribution point at a pressure of 2.5 bar. This may be adjusted up or down depending on the client

sneeds, as noted above. The pump is controlled by level sensors in the product break tank.The product surge tank serves several purposes. Primarily, it provides a water storage buffer toaccommodate brief mismatches between the desalination system output and product transferflowrates, as can occur when either system is being started up or shut down, or during initial flowbalancing during plant commissioning. Without this buffer, pumps, piping, and other equipment couldbe damaged. Secondly, it forms a physical break in the product water stream, so that any chemicallytreated water cannot inadvertently be drawn back into the reverse osmosis system, which canpermanently damage the membranes. Finally, the product surge tank can be used to provide a backupsupply of water for flushing and cleaning of the membrane systems.


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All parts of the product transfer system are compatible with the chemicals explained later in ChemicalDosing Systems section.

Product Water pH Adjustment

The process of desalination reduces the pH of the final product water to the range of 6 pH units. Thiscan be objectionable to some customers or in cases where the water supply requires a higher pHrange, sometimes 7-8 pH units. The Chemical Dosing System includes a product water pH adjustmentsystem. By dosing sodium hydroxide (NaOH), the pH of the product water will increase. The dosingrate is typically determined on site, as it is a function of flow, final pH requirement and chemicalconcentration.

Delivery

Estimated delivery of the above plant will be as follows.

Table 15.0 Product deliveryNo Category Value

1 Process to deliver product




5 Turndown ratio 1



8 Power load 712 kW

Table 15.0.1 Permeate to posttreatment

No Category Value

1 Dwg/Tag 151/SU-1200-PW-01-151

2 Quantity 1

3 Type & Design continuous, open tank, surge

4 Manufacturer -


6 Material concrete





11 Height, mm 3000

12 Spill berm no



60/125

No Category Value

14 Fluid permeate


Table 15.0.2 Product pump

No Category Value

1 Dwg/Tag 151/PCB-01-151

2 Quantity 3

3 Fluid permeate



6 NPSHr, m 10

7 speed,RPM 15008 Efficiency 0.854

9 Load, kW 307.3

10 Manufacturer -


12 Type between bearings


14 casing 316L

15 impeller 316L

16 ANSI rating #150

17 Seals balanced


Table 15.0.3 Product pump motor vsd

No Category Value


2 Quantity 3


4 Manufacturer -




Table 15.0.4 Permeate to posttreatment

No Category Value

1 Dwg/Tag 151/SMX-02-151

2 Quantity 1


61/125


62/125

No Category Value

5 Turndown ratio 5



8 Power load 0 kW

Table 15.2 Lime water dosing

No Category Value

1 Process to dose lime water

2 Service auxiliary continuous process


4 Fluid/Capacity service water/5.762m3/h

5 Turndown ratio 26 Standby capacity 100 %


8 Power load 7 kW

Table 15.2.1 Mixing tank

No Category Value

1 Dwg/Tag 151/MXV-01-151

2 Quantity 1


4 Service & Function continuous, dissolve



7 Manufacturer -



10 Gear ratio 10







17 Starting VSD

18 Frequency 50

19 Voltage 220V/3ph


63/125

No Category Value


21 Speed, rpm 1500

Table 15.2.2 Mixing tank

No Category Value

1 Dwg/Tag 151/MXV-02-151

2 Quantity 1


4 Service & Function continuous, dissolve




9 Design flow rat

Technical offer

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