IM-P077-02 ST Issue 6 9
3. Installation
Note: Before actioning any installation observe the 'Safety information' in Section 1.
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended installation.
3.1 Check materials, pressure and temperature and their maximum values. If the maximum
operating limit of the product is lower than that of the system in which it is being fitted,
ensure that a safety device is included in the system to prevent overpressurisation.
3.2 Determine the correct installation situation and the direction of fluid flow.
3.3 Remove protective covers from all connections.
3.4 The trap must be installed with the body upright so that the bucket is rising and falling
vertically. When superheat conditions exist the trap body may need to be primed with
water prior to steam being turned on to avoid steam blowing through the trap.
3.5 Inverted bucket steam traps do not permit rapid release of air. On process applications,
in particular, this can lead to slow warm-up times and waterlogging of the steam space.
A separate external air vent is therefore required in parallel to vent air efficiently. Any
bypass should be positioned above the trap. If it is below, and is leaking or left open,
the waterseal could be blown away leading to steam wastage. Where inverted bucket
traps are fitted in exposed conditions the possibility of freezing damage can be reduced
by thermal insulation.
3.6 Traps must be installed in a horizontal pipeline. The inlet of the trap should be
below the drain point of the plant being drained, so that a waterseal can be maintained
around the open end of the bucket. A small drop leg should preceed the trap - typically
150 mm (6").
3.7 Where the trap discharges into a closed condensate return system or where there is
a lift at the trap, a check valve should be fitted downstream of the trap.
3.8 If the trap has to be installed at a higher point than the drainage point then a small
bore riser into a 'U' seal should be used. A check valve should be fitted before the
trap to prevent the loss of the internal waterseal.
3.9 If the trap has to be installed on a superheated steam system application, then a non
return valve should be fitted on the trap inlet, to prevent the trap from losing its
waterseal.
Priming of the trap with water may be required before commissioning.
3.10 When welding the trap into the pipeline, this should be carried out by the electric arc
process. If it is installed in exposed positions, considerations should be given to
insulating the trap.
Note: If the trap is to discharge to atmosphere ensure it is to a safe place, the discharging
fluid may be at a temperature of 100°C (212°F).
After installation or maintenance ensure that the system is fully functioning. Carry out tests
on any alarms or protective devices.
4. Commissioning
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