Spirax Sarco BPT13 - Maintenance; General Information

IM-P122-02 CMGT Issue 11
10
BPT13 Balanced Pressure Thermostatic Steam Traps
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, ensure that all 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 fit a new capsule and seat:
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Remove the cap (2) using a spanner.
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Lift out the spring (5), capsule (4) and spacer plate (6).
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Unscrew the valve seat (7).
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Remove the strainer screen (9) if present and the seat gasket (8).
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Fit a new seat gasket (8) and clean the strainer screen (9) before replacing or replace the strainer screen
with new.
-
Screw in a new valve seat (7). Use a small amount of anti-seize compound on the threads and tighten to
the recommended torque (see Table 1).
-
Drop in the new spacer plate (6) ensuring it is located centrally on the valve seat (7). Note: Early spacer
plates are unidirectional and must be tted with the highest points uppermost. This does not apply to later
models, which can be tted either way up.
-
Fit the new capsule (4) and spring (5) ensuring that the conical spring is positioned with the narrow end
pointing downwards in contact with the capsule.
-
Screw on the cap (2) using a new 'O' ring (3) assembled into the groove in the top of the cap, or in older
models using a new gasket. Note: The spares pack contains 2 sizes of 'O' ring, use of the correct 'O' ring
is explained in the note contained within the package. Tighten to the recommended torque (see Table 1).
6. Maintenance
Table 1 Recommended tightening torques
Item Part
or
mm
N m (lbf ft)
2 Cap
'O' ring 50 A/F 50 - 60 (37 - 44)
Gasket 50 A/F M10 x 30 90 - 110 (37 - 44)
7 Seat 17 A/F 35 - 40 (26 - 29)