IM-P068-24 ST Issue 58
6. Maintenance
Note: Before actioning any maintenance programme observe
the 'Safety information' in Section 1.
6.1 General information:
- Before undertaking any maintenance on the trap it must be isolated from both the supply
line and return line and any pressure allowed to safely normalise to atmosphere. The trap
should then be allowed to cool.
- When reassembling make sure that the joint faces are clean.
- Maintenance can be completed with the trap in the pipeline, once the safety procedures
have been observed.
- It is recommended that new gaskets and spares are used whenever maintenance is
undertaken.
- Ensure that the correct tools and necessary protective equipment are used at all times.
- When maintenance is complete open isolation valves slowly and check for leaks.
6.2 How to service
- Remove the insulating cover (7), if fitted, and unscrew the cap (2) using a suitable spanner
or socket. Do not use stillsons or a wrench of similar type which may cause distortion
of the cap.
- If the seating faces on the body are only slightly worn, they can be refaced by lapping
on a flat surface, such as a surface plate. A figure-of-eight motion and a little grinding
compound, such as 'Carborundum Co's Compound I.F.' gives the best results.
If the wear is too great to be rectified by simple lapping, the seating faces on the body
must be ground flat and then lapped.
Note: the disc (3) should always be replaced with a new one. The total amount of metal
removed in this way should not exceed 0.25 mm (0.010").
- When reassembling, the disc (3) is normally placed in position with the grooved side in
contact with the body seating face (1).
- Screw on the cap (2) to the recommended tightening torque (see Table 1); no gasket
is required but a suitable high temperature anti-seize grease should be applied to the
threads.
6.3 How to clean or replace the strainer:
- Unscrew the strainer cap (5) using a suitable spanner.
- Withdraw the screen (4) and clean or, if damaged, replace with a new one.
- To reassemble, insert the screen (4) into the strainer cap (5), then screw the strainer cap
into place. A fine smear of 'Molybdenum Disulphide' grease should be applied to the first
few threads. Care should be taken to ensure that the gasket and gasket faces are clean.
- Tighten to the recommended torque (see Table 1).
- When maintenance is complete open isolation valves slowly and check for leaks.
After installation or maintenance ensure that the system is fully functional. Carry out tests on
any alarms or protective devices.
4. Commissioning
The thermodynamic steam trap will discharge condensate with a blast type action at a
few degrees below steam saturation temperature, due care must be given to the site
of the discharge.
5. Operation
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