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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
Dynamic (Differential) Scale Loop H200/H400
The Dynamic (Differential) scale loop is a tube blocking system
for the evaluation of scale inhibitors. The basic principal
involves mixing two incompatible brines in a narrow bore test coil.
Scale begins to form in the coil creating a differential pressure.
The time taken for this formation gives an indication of inhibitor
performance.
Techbox Systems manufacture units to suit all temperature and
pressure requirements.
Our standard test rigs are the H200 (200 Bar, 2900 psi) and H400
(400 Bar, 5800 psi) units. Both operate at up to 250°C (482°F).
Techbox H200 & H400 DSL
We specialise in designing and manufacturing bespoke equipment
to meet customer’s specific requirements.
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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
The units operate using two HPLC pumps each providing precise
flow rates of up to 10 ml/min. Pump 1 is fed through a switching
unit (a series of solenoid valves) which enables the inhibitor
dilution to be changed. It also enables automatic cleaning.
Schematic
The computer controlled fan assisted oven contains two pre-heat
coils in addition to the test coil. Fluid temperature is monitored
and recorded prior to entering the test coil. The oven temperature
is also recorded.
Oven temperature can be changed programmatically during the
test.
Oven Internal
Quality, German built Knauer pumps are used with twin pistons to
ensure smooth flow. Pumps have built in pressure transducers with
priming port. The pressure transducers provide an additional layer
of safety to stop the pumps should the pressure increase above the
maximum permissible.
HPLC Pumps
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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
Our units offer a heat exchanger with forced air cooling on the
outlet. This ensures that even when testing at 250°C the waste
fluid has cooled to a safe level before leaving the machine. The
differential transducer, balance valve and back pressure valve are
all located on the right of the rig with easy access for
maintenance.
Heat exchanger, balance valve & Differential transducer
For safety, our rigs incorporate a gauge on the front panel as a
quick indication of pressure in the system. This is in addition to
two over pressure PRV’s.
A Peristaltic Pump is used to circulate water around the back of
the pump heads. This flushes the piston rods preventing premature
damage to the seals.
Peristaltic Pump
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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
Techbox H200 & H400 DSL Software (Main screen)
The control software enables the user to view all data in an
easy to understand manner. The graphs display historical pressure
and temperature information, whereas the schematic shows all
current data in addition to the pumps status. Differential
Pressure, System Pressure, Fluid Temperature, Oven Temperature and
Pump Flow Rates are displayed.
Techbox H200 & H400 DSL Software (Program screen)
The programming screen enables up to 20 dilutions to be
programmed. The program varies the amount of fluid passing into
pump 1 through the switching unit. This
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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
enables the concentration of inhibitor to be varied in steps.
The inhibitor concentration is gradually reduced over the 20 steps
until scale starts to form in the test coil. This is indicated by
an increase in differential pressure. At this point the cleaning
process starts. Normally, this would comprise de-scaler followed by
de-ionised water. Up to 5 cleaning steps are available.
Model H200 H400
Max Pressure 200 Bar (2900 psi)
400 Bar (5800 psi)
Fan Assisted Oven S S
Cooling Bath O O
Max Temperature 250°C (482°F) 250°C (482°F)
Automatic Testing S S
High Pressure S S
Pump Type HPLC HPLC
Exchangeable Test Coil S S
High Accuracy Differential Transducer S S
Piston Flushing S S
Pressures Displayed & Logged S S
Temperature Displayed & Logged S S
Safety Pressure Relief S S
System Pressure Control S S
S-Standard O-Option
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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
Typical result graph
The above graph show typical results. The untreated brine forms
scale and starts to block the test coil after about 12 minutes
(Blank). The test is then repeated with scale inhibitor present,
firstly at 3ppm, automatically reducing to 2ppm after 45 minutes
and finally reducing to 1ppm after 90 minutes. At about 110 minutes
the test coil starts to block again indicating insufficient
inhibitor. At this point the unit automatically cleans itself.
1
2
3
0.00 20.00 40.00 60.00 80.00 100.00
Dif
fere
nti
al P
ress
ure
(p
si)
Test time (Minutes)
Typical Scale Inhibition PerfomanceSulphate Brine at 90°C and
250psi
Untreated Brine
3ppm 1ppm
1psi differential pressure increase
2ppm
Scale Inhibitor
MIC of 2ppm
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Techbox Systems Tel: +44 (0) 1339 755856 Aspen Lodge Email:
[email protected] Braemar Road Web: www.techboxsystems.com
Ballater AB35 5RQ UK
Specifications
• Standard range of systems covering pressures 0 – 400 bar (5800
psi) (Higher on request).
• High accuracy differential pressure measurement.
• Fluid temperature monitoring and recording.
• Oven temperature monitoring and recording
• Fully automated enabling a series of tests to be run with
decreasing inhibitor concentrations until the minimum ppm is
found.
• Automated cleaning system.
• Flow rate of 0-10ml/min per pump (20ml/min total)
• Replaceable test coil.
• Different length test coils available.
• Available as 110V or 240V.
• Standard test temperatures up to 250°C (482°F).
• Latest, user friendly windows based Techbox software.
• Overnight testing possible.
• Small sample volumes.
• Data saved in Excel compatible format.
• Supports two cleaning fluids as standard
• 4 port PEEK switching unit
• Test settings can be saved and reloaded for easily repeatable
tests.
• Back pressure valve supplied with interchangeable springs
covering typical pressure ranges.
• Supplied with PC pre-loaded with control software.
Other options available on request including: -
• Low temperature option
• High pressure option
• Manual version
• Monel tubing available for heated areas.
• Filter
• PH reading on the outlet