Chemical Cleaning

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 1 of 10

TECHNICAL SPECIFICATION

PROJECT:

2 X 300 MW EMCO Energy Thermal Power Project at Warora

EPC CONTRACT:

ECPL / SHANGAI ELECTRI CORPORATION.

ARUDRA ENGINEERS PRIVATE LTD. Chennai.

THIS DOCUMENT IS THE PROPERTY OF AEPL AND HIS ONLY ALLOWED TO BE USED BY EXPRESS PERMISSION FROM AEPL - CHENNAI.

TECHNICAL SPECIFICATION FOR PRE-

COMISSINING CHEMICAL CLEANING OF 2 x 300 MW BOILER AND PRE BOILER

ARUDRA ENGINEERS PVT LTD No-79 Valmiki Street,

Thiruvanmiyur-Chennai-600041 Phone-044-2442 4755 /2490 1623 Fax 044-2442 4755

Email: [email protected]


1. PLANT DETAILS

2. BOILER DETAILS

3. INTRODUCTION

4. PREPARATION

5. SEQUENCE OF PROCESS

6. PART- I HOT ALKALI FLUSHING OF BOILER FRONT SYSTEM

7. PART-II BOILER CHEMICAL CLEANING

8. INPUT REQUIREMENT FROM APL/SHUAN

9. SAFETY PRECAUTIONS

10. ANALYTICAL PROCEDURE

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 3 of 10 1. PLANT DETAILS: GMR ENERGY LTD: 2 X 300 MW, project is located at Warora,Maharastra. 2. BOILER DETAILS: SUPPLIER : SHANGAI ELECTRICAL CORPORATION. MCR : 1025 TPH TYPE : Natural Circulation Generation Capacity : 300 MW Each unit

3. INTRODUCTION: 1. The following will constitute brief Technical specifications in connection with Pre

Commissioning chemical cleaning of 2 x 300 MW boiler and pre-boiler system during Commissioning. Pre boiler system Feed water system and Condensate System) must be cleaned (Hot Alkali cleaning) before Starting the Boiler chemical cleaning.

2. The aim of Chemical Cleaning is to remove mill scale, oil, paint, preservatives, rust, welding VODJV WKDW ZRXOG KDYH HQWHUHG GXULQJ WKH DVVHPEO\ RI QHZ WXEHV $IWHU FDUU\LQJ RXW WKHprocess, the internal surfaces of the tubes are passivated by means of protective layer to prevent further rusting and corrosion.

3. The Main Boiler cleaning circuit consists of the following equipments of the boiler.

Portion of Boiler Feed line Economizer Steam Drum Water Wall Tube Down Comer and Bottom Header Super heater is not included in the scope of chemical cleaning.

[Instead, it is flushed and filled up with Ammoniated Hydrazine] 4. The Pre Boiler system and Condensate system circuit consists the following Equipments.

LP PIPING FROM CEP DISCHARGE LP HEATERS BFP SUCTION & DISCHARGE HP HEATERS

4. SEQUENCE OF CIRCUITS: 4.1 ALKALI FLUSHING OF BOILER FRONT SYSTEM: CC Tank CC Pump CEP discharge CPU (By Pass) GSC LPH and By Pass FST Bypass BFP Suction BFP By pass BFP Discharge HPH and by pass Feed Control Station

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 4 of 10 4.2. ACID CLEANING OF MAIN BOILER: (i) Integral Circulation Route: CC TANK CC PUMP ECONOMISER STEAM DRUM W/W TUBES DOWN COMER BOTTOM HEADER CC TANK (ii) Circulation from left to right route: CC TANK CC PUMP LEFT SIDE, LEFT-FRONT AND LEFT-REAR W/W LOWER HEADER LEFT SIDE, LEFT-FRONT AND LEAF-REAR W/W DRUM RIGHT SIDE, RIGHT-FRONT AND RIGHT-REAR W/W RIGHT SIDE, RIGHT FRONT AND RIGHT-REAR W/W LOWER HEADER BACK TO MAIN PIPE CC TANK. (iii) Circulation from right to left route: CC TANK CC PUMP RIGHT SIDE, RIGHT FRONT AND RIGHT-REAR W/W LOWER HEADER RIGHT SIDE, RIGHT FRONT AND RIGHT REAR W/W DRUM LEFT SIDE, LEFT-FRONT AND LEFT-REAR W/W LEFT SIDE, LEFT FRONT AND LEFT-REAR W/W LOWER HEADER CC TANK 4. PREPARATION:

1. Temporary chemical cleaning system will be made readily available. 2. The whole process will be carried out using our blending tank, circulating pumps, piping

and valves, which form a temporary circuit with the main boiler. 3. The common header of circulating pumps will be connected to the Economizer inlet feed

at control station. Due care and precaution shall be taken to prevent ingress of any acid in to the Boiler feed lines, if necessary, using plugs.

4. All the drum internals will be removed before chemical cleaning and reinstalled after

completion of First Stage Passivation by the customer. 5. Down comers are suitably fitted with orifice plate to improve more flow through water

wall steam generation tubes. 6. Bottom header end caps of the lower ring header will be removed and necessary piping

of temporary circuit will be welded. After completion of the cleaning process, piping will be cut and end caps are reinstalled.

7. A separate line connecting all the drains from the dissolving tank, main boiler and all

other pipelines will be laid and led to a separate neutralization pit where neutralization of effluents after each process will be carried.

8. Necessary safety precautions will be taken during cleaning process to prevent any sort of

injury to the operating personnel.

9. All instrumentation lines will be either plugged or removed temporarily during cleaning by the customer to prevent entry of acid.


10. Chemical analysis will be carried out during process for the required test results.

11. Adequate DM water, steam and compressed air specified chemicals will be made available at site.

12. Take trial run of individual circulation pump and check the total System to the shut off

pressure of the pump for any leakages.

13. Chemical cleaning area shall be covered with safety barricade tape.

14. Inhibitor evaluation test will be carried out prior to the chemical cleaning.

15. 2 nos. of Sample tubes 200 mm each cut vertically and it will be kept in steam drum and the mixing tank.

16. Express laboratory will be set up nearer to the chemical cleaning area.

17. Ensure all Safety Equipment will be kept ready for emergency use.

18. Ensure Lighting Facility in chemical cleaning area

19. Ensure availability of emergency power supply.

5. SEQUENCE OF PROCESS: 1. HOT ALKALI FLUSHING OF BOILER FRONT SYSTEM:

Mass Flushing

Hot Alkali Flushing

DM Rinsing

2. CHEMICAL CLEANING OF MAIN BOILER:

Mass Flushing

Hot Alkali Flushing

DM rinsing

Inhibited acid cleaning

DM rinsing

Rinsing

Passivation

Boiler Restoration

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 6 of 10 6. PART-I : HOT ALKALI FLUSHING OF BOILER FRONT SYSTEM 1. Introduction:

1. It is important that the newly erected feed water and condensate pipeline must be thoroughly cleaned to remove Dirt, rust, oil and grease, welding debris etc. The complete removal of the above things ensures clear condensate free from contaminants required for trouble free operation during start up and loading operation of the unit.

2. The procedure is essentially involves circulating the alkaline solution which has been

found to be superior emulsifying agent with a high degree of detergent properties enabling complete removal of debris from the system. The added advantage of using alkaline solution is that it can as well as be employed for flushing of both coil and shell side of heater having copper alloys without any fear.

3. After installation of regenerative equipments and auxiliary units, the temporary pipe work has to be completed as per drawing.

4. Temporary pipe work has to be tested hydraulically. If any leakage is observed it should be rectified. However, the following points may be ensured before commencing the process.

2. Preparation:

Temporary piping to be done as per the scheme. All permanent strainers to be removed before commencing the flushing activity. Flow element to be replaced by spool pieces while making temporary

connections. All valves on steam line to and from deaerator should be closed. Ensure availability of chemicals, lab reagents and apparatus for testing at site. All safety valves to be removed from HP heater and LP heater. Suitable blanks

to be provided with valve for proper air venting. While carrying out flushing of shell side of HP & LP Heaters, air vent should be

properly operated. All instruments in the system to be isolated before flushing. Ensure permanent supports are provided for all valves and pipelines before

starting of process.

3. MASS FLUSHING: Mass Flushing is carried out initially with cold filtered water / DM water. After filling the system, direct flushing is continued till the effluent water is clear. 4. HOT WATER FLUSHING:

The system is filled up and circulation is established. The temperature of the water is raised by admitting steam to get around 70oC to 80oC. Circulation is continued for 6-8 hrs, check turbidity and conductivity of water at inlet and outlet. When the values of turbidity are less than 20 NTU and conductivity is less than 25 s/cm2 continue the next process without drain. 5. HOT ALKALI FLUSHING / DEGREASING:

Chemicals must be mixed little by little observing the foaming in the mixing tank.

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 7 of 10 Chemicals: Trisodium Phosphate 0.4 0.45%

Di sodium Phosphate 0.10 0.20 % Non Ionic Wetting Agent - 0.05%

After adding the above chemicals, the temperature of the solution to 70oC to 80oC, which is to be maintained throughout the process. Keep the circulation 8 to 10 hrs. The samples are taken out from inlet and outlet at regular intervals. The same samples are analyzed for TSP, DSP, temperature and pH value. After getting the steady values at inlet and outlet then drain the complete system.

7. DM WATER RINSING: Fill up the system with DM water and rinse the system by continuous filling and draining method circuit-wise by running the pump at the maximum flow rate. The rinsing is continued till a clear effluent is obtained indicating complete cleaning of the system. The flushing is terminated once the water is clear and free from alkaline solution for visual appearance. Besides conductivity measurements at the inlet and outlet points shall be taken as a guiding factor for termination within reasonably acceptable limits of conductivity difference. 8. RESTORATION: After completion of cleaning all temporary system will be removed and restored the permanent system. 9. UTILITY REQUIREMENTS:

S.No DESCRIPTION REMARKS

A Utility Requirements

1 DM water (for one unit cleaning) 770 M3/unit 2 Service water(for one unit cleaning) 500 M3/unit 3 Electrical A.C. Power supply (3 phase 415 V) 300 Kw 4 Emergency Power supply (3 phase 415 V) 200 Kw 5 Construction Power Supply (3 Phase 415 V) 125 Kw

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ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 8 of 10 7. PART-II: CHEMICAL CLEANING OF MAIN BOILER: 1. SCOPE: The cleaning process covers a portion of feed line, Economizer, Steam drum, water walls, down comers, risers and bottom headers, etc. 2. TECHNIQUE:

1. Chemical cleaning is to be done adopting circulation technique. The water touched pressure parts are cleaned using inhibited Hydrochloric acid and the solvent is circulated in the water touched pressure parts by using chemical cleaning pump.

2. The cleaning operation comprises of the following major steps. o SUPER HEATER BACK FILLING o COLD AND HOT WATER FLUSHING o HOT ALKALINE CLEANING (DEGREASING) o INHIBITED ACID CLEANING o MILD ACID RINSING o PASSIVATION

3. SUPER HEATER BACK FILLING: The Super Heater is back flushed with DM Water using Super Heater Back filling line. It is further filled up to overflow with DM water containing Hydrazine to the concentration of 200 ppm and pH maintaining above 9.5 by the addition of Ammonia. keep the water wall tube sample inside the steam drum then the manhole is closed. 4. COLD AND HOT WATER FLUSHING: The temporary circuit consisting of blending tank, circulating pumps, valves and piping is fabricated and erected as per the drawing. The complete circuits are tested and ensure no leaks. DM Water is filled up and the system is flushed till the water is clear by visual observation. Further to this flushing, raise the temperature 700 C and flushing is continued. This flushing is carried out for 6 - 8 hours to achieve stability of the parameters. 5. HOT ALKALINE CLEANING (DEGREASING) Fill up the system, establish circulation and raise the temperature of the system to 60oC - 70oC. The process chemicals may be added in the following concentration in the mixing tank. Chemicals:

Trisodium Phosphate - 0.3% 0.4 % Di-sodium phosphate - 0.1% - 0.2% Non Ionic Wetting Agent - 0.05%

Keep the circulation 8 10 hrs. The samples are taken out from inlet and outlet at regular intervals. The same samples are analyzed for alkalinity and pH value. After getting the steady values at inlet and outlet, then drain the complete system.

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 9 of 10 6. DM WATER RINSING: Fill up the system with DM water and establish circulation. Rinse the system by continuous filling and draining method. The rinsing is continued till the pH value is same in I/L and O/L. The flushing is terminated once the water is clear and free from alkaline solution. 7. INHIBITED ACID PICKLING After DM water rinse, the DM water is circulated and its temperature increased to 6050 C. Add the following chemicals one by one.

a. Inhibitor Coronil 213 SPL - 0.20 0.30% b. Hydrochloric Acid - 4.0 4.5 % c. Sodium Fluoride - 0.15 %

Circulation is continued for 4-6 hours, during the process total iron and acid strength is checked in the inlet and outlet sampling points at regular intervals. Circulation is continued until the steady value is reached at a gap of 30 minutes. At this juncture the whole solution is completely drained by displacement method using DM water. The drained acid solution is neutralized using lime and sodium hydroxide, and then discharged to the storm water drain. 8. DM WATER RINSE: The boiler is filled up with DM water and keeps circulation for 1 hr then drain completely by displacement method using DM water. Analyze the pH and Fe. The pH of the circulating solution should not be allowed to go beyond 4.0 in order to prevent the precipitation of Iron hydroxide, which may settle down on the cleaned Boiler surfaces. 9. RINSE AND PASSIVATION: In this process, 0.15 % phosphoric acid and 0.20 % sodium poly phosphate is added in the system through mixing tank. Raise the temperature to 45 5oC and then re-circulate for 1 2 hours. Then adjust the pH valve to 9.5 10.0 by adding NH3 and then circulate for 4-6 hours. During this process test for iron is carried out.

10. INSPECTION:

The drum man hole is opened, the exhaust fan / man cooler shall be provided on one side of steam drum manhole door to avoid sweating. The internal surfaces visually inspected for uniform protective magnetite layer. All loose debris in the Steam Drum is cleaned manually. Bottom header shall be flushed with water, to make it free from loose mucks. Remove all the temporary piping and restore the boiler for second stage passivation.

ARUDRA ENGINEERS PVT LTD Project EMCO ENERGY THERMAL POWER PROJECT LTD Title PROCEDURE FOR CHEMICAL CLEANING Rev 0 Page Page 10 of 10 11. UTILITY REQUIREMENTS:

S.No DESCRIPTION REMARKS


1 DM water (for one unit cleaning) 5000 M3/unit 2 Service water(for one unit cleaning) 1000 M3/unit 3 Electrical A.C. Power supply (3 phase 415 V) 300 Kw 4 Emergency Power supply (3 phase 415 V) 200 Kw 5 Construction Power Supply (3 Phase 415 V) 125 Kw

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ARUDRA ENGINEERS PVT LTD PROJECT EMCO ENERGY THERMAL POWER PROJECT LTD CLIENT EVERSENDAI CONSTRUCTION PVT LTD Rev o TITLE SAFETY PROCEDURE FOR CHEMICAL

CLEANINGPage 1 of 3

SAFETY PROCEDURE


CLEANINGPage 2 of 3

1. SAFETY PRECAUTIONS:

Alkaline /Acid solution may cause skin burning and its fumes are injurious to eyes. All the safety precautions must be taken during process.

All operators and workers must use rubber gloves, eyes protecting glasses, apron, gumboots, masks etc.

Due precautions must be taken while tightening the flanges of temporary piping joints of the loops during process.

Ensure the availability of first aid box in the site.

No drilling, welding and cutting operations are allowed during the process.

Before the person enters the Steam Drum, its manhole may be kept opened before 2 hrs and air may be forced in side the Drum during the period.

2. SAFETY EQUIPMENTS:

S.No Item

01 Gum boots (various sizes) 02 Rubber Gloves 03 Rubber or Polythene Aprons 04 Helmets 05 Safety Goggles plain glass 06 Face mask (Transparent, plastic)

First aid box

3. EMERGENCY PROVISIONS

Flushing and washing water supplies.

Ample supplies of tepid flushing and washing water supplies shall be provided at all possible points of discharge, spillage or escape of chemicals.

Adequate provisions shall be made for emergency treatment of the eyes, comprising eye wash bottles, located conveniently to places where discharge, spillage or escape of chemicals can occur

Safety shower shall be provided.

A suitable first aid treatment room with outside telephone facilities shall be provided within a reasonable distance of the place where chemicals are being used.

The protective clothing and apparatus required for emergency use shall be made available near the acid cleaning area.


CLEANINGPage 3 of 3

4. FIRST AID TREATMENT:

4.1 Splashes of the eye

Immediately flood the eye with to be effective the eyelids must be opened. The eyelids should be pushed apart using the thumb and index finger of the left hand. The casualty neither will probably nor is able to open the eye himself because of painful spasms. If an eye wash bottle is used the jet should not be directed at the front of the eye. It should be directed in from the side, so that flow is over the surface of the eye.

Irrigation should be continued for 5 10 minutes after which the casualty should be taken to the first aid room.

Irrigation should be continued in the first aid room. Remember vision is saved by thorough irrigation; no other treatment can prevent damage if this is omitted.

After thorough irrigation the eye should be covered with a pad; the patient should be referred for medical opinion.

4.2 Irritation of the skin

If signs of skin irritation occur the persons should be removed from contact and referred for medical opinion. In the event of the splashing of the skin with chemicals the effected area should be washed thoroughly avoiding spreading contamination to the face and eyes.

5. EMERGENCY PROCEDURES:

The testing team should be aware of the operating procedures of fire extinguishers to be used for quenching minor or major fires.

The testing team should be aware of the procedure to be followed in case of accidents involving personnel injury.

In case of failure of running pump the stand by pump should be started immediately without delay.

An operator posted at the pump, area should be instructed to stop the pumps and properly isolate the system in the event of emergency. All operators should be well conversant with the emergency operating instructions

6. General Safety

Test area will be cordoned off and unauthorized persons entry shall be prohibited. Suitable shall be displayed.

Whenever any inspection is made during the cleaning process, the location should be adequately ventilated.

ARUDRA ENGINEERS PVT LTD PROJECT EMCO ENERGY THERMAL POWER PROJECT LTDCLIENT EVERSENDAI CONSTRUCTION PVT LTD Rev o TITLE TESTING METHOD FOR CHEMICAL CLEANING Page 1 of 7

CHEMICAL TESTING PROCEDURE

ARUDRA ENGINEERS PVT LTD PROJECT GMR ENERGY LTD

CLIENT UTILITY ENERGYTECH ENGINEERS PVT LTD Rev o

TITLE TESTING METHOD FOR CHEMICAL CLEANING Page 2 of 7

1. INHIBITOR EVALUATION

INHIBITOR:

An inhibitor is a chemical substance, when added in small concentration effectively decreased the corrosion rate. Pickling Inhibitors used for practical applications are usually mixtures of various chemicals. Most of the pickling inhibitors function by forming an absorbed layer on the metal surface. Probably, no more than a mono layer in thickness which essentially blocks discharge of HYDROGEN ION and dissolution of metal ions. It should be borne in mind that an addition of an inhibitor to an acid, the corrosion potential of steel is not altered although the corrosion rate may be appreciably reduced.

Inhibitor is chosen for a particular solvent and application to provide maximum protection and minimize substantially the rate of corrosion of parent metal. Temperature of the bath and time of contact of the metal with the solvent are decisive factors in the function.

It is therefore essential to test the inhibitor for evaluation prior to its usage specifically for two functions:

01. Percentage of protection offered 02. Corrosion rate reduction obtained

PROCEDURE:

Prepare test coupons in duplicate of the material to be chemically cleaned, for example carbon steel SA 213 T1 etc. The surface area of each coupon in no case should be less than 25 sq.cm. It should be polished on all sides. Close to mirror surface quality and free of sharp edges. There shall be no oxide scale left on the surface.

The coupon should be degreased with Acetone initially. Prepare in a container, 400 ml. of the acid bath mixed with inhibitor. Measure accurately, the surface area of the coupon - A sq.cm. Weight the acetone cleaned dry coupon - WI mgms. Prepare acid bath in 400 ml. (Hot 65-70 deg.C.). DM water adding acid solvent selected to attain required concentration of the acid and 0.3% inhibitor.




Hang the sample in the bath (nylon rope) well immersed without touching the container walls. Note the time. Keep the container in an oven and strictly maintain the temperature at 65 700

C.Remove the coupon exactly after 60 minutes. Do not touch by hand. Wash it in hot DM water several times. Acetones dry perfectly.

Cool in a dessicator. Desiccant should be only silica gel.

Weigh the coupon - W2 mgm.

Express corrosion rate mgm/sq.cm./hr.

W1 - W2 ----------- mg./sq.cm. A

Efficiency of the inhibitor is evaluated as follows:

Repeat the procedure with two weighed coupons under similar conditions of acid strength, temperature and time.

One pre-weighed coupon should be immersed in uninhibited acid for 60 minutes.

The other pre-weighed coupon should be immersed in inhibited acid for 60 minutes.

Work out metal loss in both the cases.

Efficiency of the inhibitor:

X = Loss of Wt.in uninhibited acid

Y = Loss of Wt.in inhibited acid

Efficiency = X - Y ------ x 100% X

(Accepted weight loss of mild steel should be 0.1mgm./sq.cm./hr.)




2. DETERMINATION OF TSP, DSP and Alkalinity;

Reagents required:

01. Hydrochloric Acid Standard (0.05N) 02. Mixed Indicator Solution (0.5g of bromocresol green + 0.75 gm. Of methyl

red/1 ltr.of ethylalcohol. 03. Phenolphthalein Indicator Solution (dissolve 1g. in 100 ml. Of

ethylalcohol).Procedure:

Pipette 10 ml. of filtered solution into a 150 ml beaker. Add 4 drops of phenolphthalein indicator, titrate against o.05N of HCL solution until colourless, Record the volume as (PE). Add few drops of mixed indicator to the same conical flask, titrate without refilling the burette to a reddish-grey end point. Record the volume as (ME).

Calculation:

The concentration of Na3Po4 and DSP solution as follows;

Na3Po4 (TSP) ppm: PE x 1900

Na2Hpo4.7H2o (DSP) ppm: ME - (2PE) x 1340

3. DETERMINATION OF HYDROCHLORIC ACID

Required reagents:1. 1N NaOH solution 2. Mixed Indicator (0.075 gm. Methyl Red and 0.05gm. Bromocresol Green

100ml. Ethanol). Procedure:

x Take 10ml. of sample in a clean conical flask. x Add 50 ml. of DM water x Add 3-5 drops of Indicator x Titrate it against 1N NaOH solution x The end point is red to green

Calculation: % of HCl = T.V. x 1N x 36.5 x 100 ---------------------------- 10 x 1000




= T.V. x 0.365

5. DETERMINATION OF IRON

Required reagents:1. 0.05 M EDTA 2. Chloroacetic acid 10% 3. Sodium Acetate 10% 4. Sulphosalicyclic Acid 20% 5. Potassium Per-sulphate

Procedure:x Take 10ml. of aliquot in a clean Erlenmeyer flask. x Add 5 to 10 drops of 10% chloroacetic acid solution. x Add 5 to 10 drops of 10% sodium acetate solution. x Add 5 drops of 20% sulphosalicyclic acid. x Add pinch of potasium persulphate x Titrate against 0.05 M EDTA x End point is red to pale yellow colour. x

Calculation:

Iron as Fe ppm = T.V. x 0.05 x 55.847 x 1000 --------------------------------- V

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10.0 INPUTS REQUIREMENT FROM ECPL Sr.No DESCRIPTION REMARKS


1 DM water (for one unit cleaning) 3500 M3/unit 2 Service water(for one unit cleaning) 5000 M3/unit 3 Electrical A.C. Power supply (3 phase 415 V) 300 Kw 4 Emergency Power supply (3 phase 415 V) 200 Kw 5 Construction Power Supply (3 Phase 415 V) 125 Kw *6 Auxiliary Steam supply 10-15 T/hr @ 15 Kg/Cm2 at 185 Deg C.(in continuous

rating) Optional *7 Neutralization Pit f( for Holding 2 boiler volume) B Area Requirements

1 Open Space requirement for installation of chemical

cleaning system and auxiliary boiler. 20 m X 15 m

2 Open Area requirement for site office/ material and chemical storage.

12 m x 15 m

3 2SHQ6SDFHUHTXLUHPHQWROHYHOIRULQVWDOODWLRQRIpre-fabricated neutralization tank on river bed

45 m x 15 m

C General Requirements

1 Hydra Crane facility for loading & unloading of materials and equipments.

2 Necessary cutting and re-welding of permanent line if required

3 Removal and refitting of drum internal 4 Round the clock gate pass 5 Incoming power supply cable from your panel board up to

cleaning area.

6 Illumination facility at cleaning area 7 Fire tender/ambulance facility during cleaning process for

emergency use

8 Necessary road crossing digging and refilling for laying temporary drain pipe from chemical cleaning area up to neutralization pit.

Note:

*6. Offer Enclosed *7. Offer Enclosed

11. LIST OF EOUIPMENTS.

Sr.No DESCRIPTION OF ITEM QTY 01 Chemical Mixing Tank (20 M3) 1 No 02 Motor Pump (2 Pump running, 2 Standby ) (Technical

Spec- 150 HP /2900 RPM/300 M3 /hr at 12 Kg/CM2 ) 4 Set

03 MCC Panel 150 HP 1 Set 04 C.S. Valves 150 Class With Flange

8 Inch As required 6 Inch As required 4 Inch As required 3 Inch As required 2 Inch As required 1 Inch As required 8 Inch NRV As required 4 Inch NRV As required

05 M.S. ERW PIPES

8 Inch 800 M 6 Inch 150 M 4 Inch 475 M 3 Inch 100 M 2 Inch 200 M 1 Inch 50 M

06 Nitrogen Manifold with Regulator.

1 Set

07 Pressure Gauges 0-20 kg/cm2

6 Nos

08 Temperature Gauges 0- 100 0C

3 Nos

09 Compound gauges 1 214

1 Set

10 Pipe fittings Elbows/Reducers

As required

11 Tools Box with tools

As required

12 Express Laboratory

1 Set

13 Auxiliary Boiler 20 TPH @17.5 kg / cm2@ 205 DegC 1 sets

14 Neutralization tank 180 M3 each

3 tank

Chemical Cleaning

Documents

boiler chemical cleaning

mw boiler

boiler details

chemical cleaning rev

preboiler system

main boiler cleaning

scope of chemical cleaning

aim of chemical cleaning