Behncke PWT 510 Instrucciones De Operación página 71

Figure 7: Cleaning table
CLEANING PRODUCT
WATER
SODIUM HYDROXIDE SOLUTION
3% (NaOH)
NITRIC ACID 6% (HNO3)
SULPHAMIC ACID 6% (H3NO3S)
7.8 Check for leaks
Possible leaks in the device can be detected in the following way:
• Remove one of the lower connecting pipes and then pressurise the opposite side. After the
pressure has balanced out, no fluid must leak from the open connection. If fluid continues to come
out, there is a leak in one or several of the plates.
The plate package must then be dismantled, and each plate must be inspected carefully.
• Disassemble the heat exchanger and dry all the plates. Then put the heat exchanger back together
and circulate fluid at full flow.
Leave the other circuit depressurised and without any fluid. After a couple of minutes, stop the
circulation and open the heat exchanger very carefully so that no fluid splashes out onto the side
dried previously. By carefully examining the plates, you can identify the wet places on the dry
plates. After the zones of the faulty plates have been determined, they must be checked using
a permeating fluid.
• Dismantle the heat exchanger and check all the plates using the test fluid.
Heat exchanger PWT 510 / PWT 910 / Operation
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2
3
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6
DIRT
Mild contamination
Hard organic materials
Hard inorganic materials
Inorganic materials
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8
9
10
11
12
ENCRUSTATION
None
Organic materials
Inorganic materials
Hard inorganic materials
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