IM-P128-23 ST Issue 6
10
3.10 Welding into pipeline of socket weld variants
A universal weld procedure covering the requirements of different National and
International Standards and practices is difcult to provide - specically regarding the
welding procedure, welding conditions (run number, consumable size, current, voltage,
polarity), storage of consumables and make / type of consumables due to the abundance
of appropriate consumable suppliers.
Therefore, the information given in Section 3.10.1, is only advice based on British
Standards to be used for guidance on the essential requirements of welding socket
weld STS17.2 trap stations into the pipeline.
This will allow a user to select an appropriate weld procedure from those available
to that user.
This advice is not intended to be a substitute for a weld procedure: it is for
guidance only.
3.9 The STS17.2 can be installed in a horizontal line, or in a vertical line with ow
downwards - See Figure 2.
The STS17.2 MUST NOT be tted in a vertical line with the ow upwards -
See Figure 3.
Please note that the optional Spiratec SSL1 and WLSL1 sensors must not be fitted
when the STS17.2 is installed in a vertical application. However a sensor can be
fitted to a UTD30 steam trap if fitted.
Vertical flow
downwards
Horizontal
flow
4
4
7
Vertical flow
upwards
Fig. 2
Fig. 3
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