Increasing The Transfer Area; Spare Plates; Troubleshooting; Disposal - CIAT ITEX Manuel D'instructions

ENGLISH

5.11 - Increasing the transfer area

It is possible to add an even number of extra plates to an existing
heat exchanger, provided you:
• Check the maximum plate capacity of the heat exchanger.
• If the length is insufficient, provide new carrying bars and
threaded rods.
• Replace the nameplate.
• Leaks often occur when plates with new gaskets and plates
with old gaskets are used together (due to difference in tough-
ness). We therefore strongly recommend replacing all worn
gaskets with new ones.

5.12 - Spare plates

Plates may be replaced individually or altogether. In this last case,
however, it is recommended to replace all the gaskets (see the
previous section).
• If only a few plates are replaced, indicate the sequence of the
plates to be replaced shown on the plate arrangement drawing.

5.13 - Troubleshooting

FLUID LEAKS BETWEEN PLATE PACK AND FRAME
PROBLEM
Leak detected at the bottom of the pack.
POSSIBLE SOLUTIONS
Make sure that all the bolts are correctly tightened.
°
48
Make sure that there is no mechanical stress on any of the
°
connections.
Reposition or replace the gasket on the initial or end plate.
°
Check the internal surface of the fixed head for defects.
°
Make sure that there are no foreign bodies between the initial
°
plate and the fixed head.
Test the initial/end plate for signs of damage (cracks, holes).
°
FLUID LEAKS BETWEEN CONNECTIONS AND FRAME
PROBLEM
Fluid leaks where a connection passes through the fixed head.
POSSIBLE SOLUTIONS
If welded connections are used, check the condition of the
°
welds.
If cracks are found, contact your CIAT consultant before at-
°
tempting any repairs.
If other connections are used, contact your CIAT consultant.
°
FLUID LEAKS FROM THE PLATE PACK
PROBLEM
Leak detected from plate pack.
POSSIBLE SOLUTIONS
Measure the tightening dimension and check it against the
°
nameplate. Tighten if need be.
Mark the area around the leak with a felt-tip pen then open the
°
heat exchanger and inspect the area.
Check the sequence and alignment of the plates.
°
Check the condition of the gaskets (correct position, overall con-
°
dition, elasticity). Reposition or replace the gaskets as needed.
INTERNAL LEAKS WITH mixing of fluids
Contact your CIAT consultant as quickly as possible.
PROBLEM
The fluids in the heat exchanger are mixing together at the unit's
outlet.
POSSIBLE SOLUTIONS
Make sure that the hydraulic connections are correct.
°
Disassemble the heat exchanger and inspect the entire surface
°
of each plate for cracks and holes with penetrant. Replace any
damaged plates.
INCREASED PRESSURE DROPS
PROBLEM
The pressure drop is higher than the design value.
POSSIBLE SOLUTIONS
Check the accuracy of the measuring instruments used.
°
Test the operation of the pumps.
°
Fouling may be the cause. Clean the heat exchanger.
°
Circulate the fluids in the opposite direction to remove any
°
blockages in the pipes.
VARIATIONS IN TEMPERATURE
PROBLEM
The heat exchanger's outlet temperatures do not correspond to
the expected temperatures.
POSSIBLE SOLUTIONS
Check the accuracy of the measuring instruments used.
°
Fouling may be restricting the flow along the channels and re-
°
ENGLISH
ducing the heat transfer capacity (drop in efficiency). Clean the
heat exchanger.

6 - DISPOSAL

• Disconnect the heat exchanger from its power sources and
wait until it has cooled fully.
• Drain the heat exchanger and collect the fluids in accordance
with environmental standards.
• Dispose of the gaskets in accordance with the prevailing legisla-
tion.
• Use the lifting systems employed when installing the heat ex-
changer.
• Check whether any part of the heat exchanger may be recycled
for another purpose.
Materials:
Consult the documentation provided with the order for informa-
tion on the materials used to fabricate the heat exchanger.
• Plates: stainless steel or titanium.
• Other metal components: carbon steel or stainless steel.
• Gaskets: NBR, EPDM, FPM, HNBR.
Insulation or plate protection materials: stainless steel or alu-
minium + polyurethane boards or cross-linked polyethylene.
EN
49