3030226 Rev. D 5-7 Routine Maintenance
5.2 Specific Maintenance Procedures and Instructions
5.2.1 Leak Repair
General information: Any leak from any part of the system should be corrected as soon
as possible. Left unattended, leaks can cause secondary damage necessitating
expensive repairs.
NOTE:
Use FDA/NSF approved silicone sealant on all threaded connections.
Threaded Connections
1. Prior to performing maintenance on any threaded fitting, release the pressure in
the piping/tubing system, i.e., turn off the pump, open a drain port, etc.
2. Remove the connecting tubing.
3. Re-tape the pipe threads with 2 or 3 wraps of PTFE tape, if required. (It is not
necessary to remove the old PTFE tape, although it may be advisable to do so if
it is in very bad shape).
4. Insert the threaded fitting into the opening and hand tighten. Be careful to
avoid cross threading. Tighten using a wrench, only if necessary, about one-half
turn.
5. Reconnect piping, pressurize, and inspect for leaks.
6. If the leak is still present, de-pressurize system and tighten the fitting an
additional quarter-turn. Excessive tightening can crack threaded fittings.
Pressurize the system and inspect for leaks.
7. If the leak continues, it may be necessary to replace the fitting.
Barbed Connections
1. Prior to performing maintenance on any fitting, release the pressure in system,
i.e., turn off pumps, open a drain port, etc.
2. Remove the hose from the barbed connection by loosening its clamp. If
permanent clamp device is used, it may be necessary to cut the tubing behind
the barb.
3. If reusing the barbed connection, ensure there is no damage to the barb
connection. Slide clamp onto hose and reinsert barbed fitting into hose and
tighten the clamp.
4. Reconnect and pressurize system and inspect for leaks. If leak continues, it may
be necessary to replace the fitting.
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