Increasing The Transfer Area; Spare Plates; Troubleshooting - Riello SP20-DN32 Manuel D'utilisation Et D'entretien

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 and the plate arrangement drawing
with the new ones provided by RIELLO.
• 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
52
Make sure that all the bolts are correctly tightened.
°
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 RIELLO consultant before at-
°
tempting any repairs.
° If other connections are used, contact your RIELLO 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.