IM-P113-02
CMGT Issue 6
8
UIB30 and UIB30H Sealed Inverted Bucket Steam Traps for use with Pipeline Connectors
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 protection covers from all connections and protective film from all name-plates, where
appropriate, before installation on steam or other high temperature applications.
3.4
If the trap has been supplied with a drain plug and is to be replaced with a drain device, this should
be completed before fixing the trap to the pipeline connector. When removing the plug or assembling
a drain device, suitable spanners must be used on the drain connection flats (
13
) and the drain plug
flats (
14
).
3.5
The UIB can be installed on any pipeline connector. See separate Installation and Maintenance
Instructions for Spirax Sarco pipeline connectors (IM-P128-06, IM-P128-11 and IM-P128-13).
Ensure that both gaskets are clean and undamaged and that the transfer holes are clear. Place the
UIB body against the connector gasket face, ensuring that the trap itself is vertical so the bucket
always rises and falls in a vertical plain.
Ensuring the new connector screws supplied with the trap are used, apply a suitable amount of
anti-seize thread lubricant to the threads of the connector screws (
10
). Tighten the screws finger
tight until the mating gasket faces are in parallel, intimate contact. Tighten the screws evenly and
gradually to the recommended torque value (see Table 1). Open isolation valves slowly until normal
operating conditions are achieved.
3.6
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.
3.7
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. When installed in a horizontal pipeline a small
drop leg should precede the trap - typically 150 mm (6").
3.8
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.
3.9
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.
3.10
If the trap is 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.
3.11
Check for leaks.
Note 1:
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).
Note 2:
On all blast discharge steam traps check valves and sight glasses must be installed at least 1 metre
(3 ft) downstream of the trap.
3. Installation