IM-P071-02
CMGT Issue 3
16
HP70 Series Bimetallic Steam Trap
Trap fails
to pass
condensate
1.
Make sure upstream and downstream valves are open.
2.
Check external strainers for clogging; blowdown or dismantle and clean.
3.
Valve port clogged with dirt. Follow 'Trap seat flushing' procedure
(See Section 6.1).
4.
Bimetallic element improperly adjusted. Adjust as described under 'Trap
discharge temperature adjustment'
(See Section 6.2).
5.
Dismantle and inspect internals. See 'Disassembly and service'
(See Section 6.4).
Trap blows
live steam
1.
Dirt on seating surface. Flush as described in 'Trap seat flushing' procedure
(See Section 6.1).
2.
Bimetallic element improperly adjusted. Adjust as described under 'Trap
discharge temperature adjustment'
(See Section 6.2).
3.
Worn valve seat. Dismantle, inspect and replace if necessary.
Note: The seat and bimetallic element must be replaced as a matched
pair.
4.
Backpressure too high. Downstream system must be corrected.
8. Fault finding
