Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 43)

Increase in Pressure Drop or a Reduction in Temperature Reading

How to Find a Defective Plate With Through Holes

Severe corrosion may cause defect to occur. The following

method is recommended to determine the location of the

defective plate or plates:

1. Open the unit, remove all fouling from surfaces and dry the

plates after cleaning. Make sure the bleed port areas (see

Figure 32) are clear.

2. After completely drying the plates, reassemble the unit.

3. Supply water to one side (“A” side) and raise the water

pressure to approximately 50 psig.

4. Open the drain valve at the lowest point or break the

ﬂange on “B” side. By removing the ﬂange and ﬁttings, it

is possible to look into the nozzle and measure to the exact

leaking plate.

5. Stop the test if water ﬂows out of the drain valve or ﬂange

on “B” side.

6. Open all valves and empty the unit of all water.

7. Open the unit promptly and ﬁnd which plate is wet on

“B” side. This plate and the preceding plates may have

defects.

8. The defect can be found by placing a lamp on the rear side of

the plate and by observing the light that passes through.

9. If the defect is small, the use of dye penetrant may be required

to locate the defect. Because of the metal to metal contact

of the plates, the defect can be larger when the plate pack is

compressed than when it is in the free state.

PROCEDURES AND OBSERVATIONS SOLUTIONS

1. The pressure drop from the inlet to the outlet on one or

both sides of the unit is too high compared to the original

speciﬁed pressure change.

Try cleaning-in-place (CIP) as described in Figures 47 and

48. Check the accuracy of the instrumentation. Pressure

taps should be installed 10 and 5 pipe diameters upstream

and downstream, respectively, from ﬂow disturbing source,

i.e., elbow, valve, reducer, etc.

2. The temperature readings are correct for the process;

however, the pressure drop is high.

The plate surfaces are clean enough, however, the inlet of the

unit could be clogged. Back ﬂushing the equipment or CIP

may solve the problem.

3. The temperature readings do not correspond to the original

temperature settings or speciﬁcations.

The pressure drop is probably also increasing. The change

in the temperature readings indicates that there is a buildup

of deposits on the plate surfaces. If CIP or back ﬂushing the

equipment does not work, the unit will need to be opened and

the plates cleaned.

4. The pressure drop is too low, and the unit is known to

be clean.

The pump capacity may be too small. Check the pump manual.

NOTE: A unit with multiple pass circuits that does

not allow the ﬂuid to drain out of each channel

on one side cannot be tested in this way unless the

special center plates are ﬁrst removed. See Figure

20 as an example.

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Velocity Edge GX325 Manual de usuario Pagina 43

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