2.4.3 Inspection for Misapplication. Inspectors should be aware of and
i n s p e c t for the following potential misapplications and installation problems.
Trap installed backwards or upside down.
Traps located too far away from the equipment being serviced.
Piping runs are too long.
T r a p s not installed at low points or sufficiently below
steam-using equipment to ensure proper drainage.
T r a p s oversized for the conditions. Oversized traps allow live
More than one item of equipment served by one trap. Group
t r a p p i n g is likely to snort circuit one item due to differences in
pressure and other items will not be properly drained.
The absence of check valves, strainers, and blowdown cocks where
r e q u i r e d for efficient operation.
Trap vibration due to insecure mounting.
Bypass line with valves open. If a bypass is necessary, it should
b e fitted with a trap.
Condensate line elevation is so high that the steam pressure
cannot lift the condensate through the trap. T r a p s do not lift
condensate; inlet steam pressure does.
Inverted bucket traps and float and thermostatic traps, which are
s u s c e p t i b l e to freezing.
Thermostatic and disk traps that are insulated. These traps must
e m i t heat to function.
D i s k trap with excessive backpressure; therefore, a differential
p r e s s u r e that is too low for the trap to operate properly.
D e t e r m i n e accessibility of trap for inspection and repair.
Ensure trap is located below drip point whenever possible.
Check whether trap is close to the drip point.