IM-P128-23
ST Issue 6
12
4. Commissioning
After installation ensure that the system is fully functioning. Carry out tests on any alarms
or protective devices. Open isolating valves slowly and ensure that there are no leaks.
5. Maintenance
Note: Before actioning any maintenance programme observe
the 'Safety information' in Section 1.
5.1 Introduction
All work must be carried out by a suitably competent person. Before starting work ensure
that suitable tools are available. Use only Spirax Sarco replacement parts.
5.2 Maintenance
Some maintenance can be completed with the steam trap station 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.
5.3 How to replace the strainer screen:
-
Before starting any maintenance work make sure that the steam trap station is isolated
from the mains pressure (both steam and condensate) and that any residual pressure
is vented to atmosphere. Allow to cool before commencing work.
-
Remove the strainer cap (
19
) with sensor (
23
and
24
if fitted) ensuring cables are
not damaged (WLSL1) or optional blowdown valve (
25
and
26
) and separate it from the
strainer screen (
22
).
-
Once the strainer screen (
22
) has been cleaned or replaced, place it in the recess of the
strainer cap (
19
or
20
).
-
Using a new cap gasket (
21
) replace the strainer screen and cap into the body of the
STS17.2 and loosely tighten to ensure the screen and gasket locate correctly.
-
Tighten to the recommended torque (see Table 1).
-
Ensure sensor cables are not twisted and are secure.
-
Recommission and ensure that there are no leaks.
5.4 How to blowdown the strainer screen:
(models fitted with blowdown valve only)
-
Periodic blowdown will remove most debris within the strainer screen. Larger debris
may require the whole screen to be removed as detailed in Section 5.3.
-
The BDV1 blowdown valve fitted to the STS17.2 has an integral valve screw (
26
), which
can be unscrewed with a 17 mm A/F spanner to blowdown the strainer screen. A lockset
screw will prevent the integral valve screw from disengaging from the valve body (
25
). A
torque of 22 - 25 N m (16 - 17 lbf ft) is recommended for resealing the integral valve screw.
Warning:
Ensure that adequate safety precautions have been taken when opening the
blowdown valve to atmosphere.
For full technical details of the BDV1 see IM-P600-02.
Summary of Contents for STS17.2
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