Causes And Corrective Measures - TLV PowerTrap GP14-B Manuel D'utilisation

Causes and Corrective Measures

Category
A.
1. The valve on the
A valve on
motive medium
the pipeline
supply pipe is closed
is closed
2. The valve on the
exhaust pipe is closed
3. The valve on the
condensate inlet
pipe is closed
4. The valve on the
condensate outlet
pipe is closed
B.
1. The strainer on the
The strainer is
motive medium
clogged
supply pipe is clogged
2. The strainer on the
condensate inlet
pipe is clogged
C.
1. The motive medium
Faulty motive,
supply pressure is
back or
less than the back
pumped
pressure
medium inlet
pressure
2. Insufficient motive
medium
3. The pumped
medium inlet
pressure exceeds
the back pressure
(see G.1. on page 34)
4. The motive medium
supply pressure is
too high
Cause
- Slowly open the valve, using the proper procedure
- Clean the strainer
- When the motive medium pressure is decreasing,
adjust the pressure reducing valve on the supply
pipe or connect to a separate high-pressure line
- If the back pressure has increased, check to see if
a steam trap connected to the pumped medium
recovery line [Sr] is blowing (see drawings on
pages 8 - 9) and check for any valves that have
been left closed on the pumped medium recovery line
- The motive medium pressure must be about 0.1 MPa
(15 psi, 1 bar) higher than the back pressure (see
page 10)
- If the motive medium supply pipe is too small, change
to a larger size pipe; the pipe should be at least
20 mm (
- When the pumped medium inlet pressure exceeds the
back pressure, "blowthrough" occurs, i.e., steam
flows into the pumped medium outlet pipe; in some
cases, chattering on the outlet check valve or water
hammer may also occur
- The same thing will occur when the back pressure has
decreased in a closed system
- Check the reason that the pumped medium inlet
pressure has increased and the back pressure has
decreased and make any necessary repairs
- If the motive medium supply pressure is twice the
back pressure or greater, "blowby" occurs, i.e.,
residual pressure at the end of the GP motive medium
supply process flows into the outlet pipe; when the
temperature of the pumped medium in the recovery
pipe is low, water hammer may also occur
- The motive medium supply pressure should be
reduced to a range within which the discharge flow
does not drop below the required level
"Causes and Corrective Measures" is continued on the next page
— 32 —
Procedure
")
/
3 4