No condensate
is discharged
(blocked)
or discharge
is poor
Replace the float
Check specifications and reselect
trap suitable for actual flow
Air binding has occurred
Perform a bypass blowdown or
consider switching to a product with
a built-in air vent or air vent valve
Rust and scale have accumulated
around the orifice or under the float
Clean
Improper tightening torque for cover
was used
Tighten to the proper torque
Water hammer occurs
Examine the piping for problems that
can cause water hammer
Float is deformed or coated with scale
Orifice is damaged
Clean or replace the float
Replace with new orifice
Trap is installed above the maximum
allowable inclination angle
Vibration of trap occurs
Correct the installation
Lengthen inlet piping, then fasten it securely
Deterioration of or damage to gaskets
Replace with new gaskets
Leakage from eroded cavities of body
or cover
Replace the trap
Flow exceeds rated capacity of the trap
Blowdown through the bypass or
close the trap inlet valve and allow
the trap to cool
Compare specifications and actual
operating conditions
Clean
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 to take appropriate corrective measures.
Instruction Manual is continued on page 28.
Steam is
discharged or
leaks from the
trap outlet
(blowing)
(steam leakage)
Float is damaged or filled with
condensate
Orifice, screen or piping are clogged
with rust or scale
Steam-locking has occurred
Float is frequently
damaged
Steam leaks
from a place
other than
the trap outlet
The trap operating pressure exceeds
the maximum specified pressure, or
there is insufficient pressure differential
between the trap inlet and outlet
Problem
Cause
Remedy
Flash Steam
White jet
containing
water droplets
Live Steam Leakage
Clear, slightly
bluish jet
Normal:
Condensate is discharged continuously with flash steam and the sound
of flow can be heard. If there is very little condensate, there is almost no
sound of flow.
Blocked:
No condensate is discharged. The trap is quiet and makes no noise,
and the surface temperature of the trap is low.
Blowing:
Live steam continually flows from the outlet and there is a continuous
metallic sound.
Live steam is discharged through the trap outlet together with the
condensate and there is a high-pitched sound.
(When conducting a visual inspection, flash steam is sometimes mistaken for steam leakage. For
this reason, the use of a steam trap diagnostic instrument such as TLV TrapMan is highly
recommended.)
Steam
Leakage:
̶ 13 ̶
English
