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9. Troubleshooting
If the expected performance is unachievable after installation of the steam trap, read chapters 4
and 5 again and check the following points for appropriate corrective measures.
Problem
Float is damaged or filled with condensate
No condensate
is discharged
Orifice, screen or piping are clogged with rust or
(blocked) or
scale
discharge is
The bimetal is damaged
poor
The trap operating pressure exceeds the maximum
specified pressure, or there is insufficient pressure
differential between the trap inlet and outlet
Steam locking has occurred
Rust and scale have accumulated around the
Steam is
valve seat or under the float
discharged or
leaks from the
Orifice is damaged
trap outlet
Float is deformed or coated with scale
(blowing)
Trap is installed above the maximum allowable
(steam leakage)
inclination angle
Vibration of trap occurs
The bimetal air vent valve surface and/or the air
vent valve seat has a build-up or is scratched
The bimetal is damaged
Deterioration of or damage to gaskets
Steam leaks from
a place other
Leakage from eroded cavities of body or cover
than the trap
Improper tightening torque for cover was used
outlet
Water hammer occurs
Float is
frequently
damaged
NOTE: When replacing parts with new, use the parts list on page 13 for reference, and replace with
parts from the respective replacement parts kits.
Cause
̶ 14 ̶
Remedy
Replace the float
Clean
Replace with new bimetal
Compare specifications
and actual operating
conditions
Blowdown through the
bypass or close the trap
inlet valve and allow the
trap to cool
Clean
Replace with new orifice
Clean or replace the float
Correct the installation
Lengthen inlet piping,
then fasten it securely
Clean or replace with
new bimetal and/or air
vent valve seat
Replace with new bimetal
Replace the gaskets
Replace the trap
Tighten to the proper
torque
Examine the piping for
problems that can cause
water hammer
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