TROUBLESHOOTING
IOM-013
Page 17 of 18
CP2 & CP5GM
Rev: D
Last updated: 4/14/2011
4. T
ROUBLESHOOTING
G
UIDE
The following is a troubleshooting table of issues most commonly associated with the
Welker
®
Constant Pressure Cylinder models. If you are having a problem that is not
listed, or if the solution provided does not repair the problem, please call Welker for
service options.
PROBLEM
POSSIBLE
CAUSE
SOLUTION
Gauge indicates a loss of
pressure.
There is a leak from one
of the fittings.
There is a leak from the
burst discs.
The cylinder experienced
a temperature drop.
There is a defective
valve.
Check all fittings for leaks
with leak detector. Replace
thread sealant.
Make sure the burst discs
are torqued properly. If the
problem persists, the discs
may need replacement.
See Table 2.
Restore the temperature to
pipeline temperature.
Repair or restore the
defective valve.
Pressure is leaking across the
piston.
Seals in the piston are leaking. Disassemble and clean the unit.
Inspect cylinder for scratches.
Replace seals in the piston and
reassemble.
See Sections 3.2-3.4.
The pre-charge or product end
cap is leaking.
The burst disc is leaking.
There is a loose fitting.
The seat on purge valve is
leaking.
Replace the burst disc.
See step 3.2 Section 13.
Tighten the fittings.
Replace the seat.
