IM-IBR16-32IN
Issue 1
18
6.6 How to replace the fixed bleed and mechanism assembly
To gain access to the mechanism assembly (
13
) the cover (
2
) needs to be removed. For this,
and any servicing, the trap may remain in the pipeline.
-
Ensure the trap is depressurised (see 'Section 6.1 - General information').
-
Unscrew the 14 off cover nuts (
5
) and remove the cover (
2
) and cover gasket (
3
). The cover
(
2
) weighs in the region of 35 kg (77 Ib) and threaded connections are provided (one at
each end) for the use of M12 lifting eyes on the PN100 flanged traps and
½
" UNC on socket
weld and class 600 flanged traps. Place the cover (
2
) down in such a manner as not to
damage the gasket face.
-
The mechanism (
13
) will now be clearly visible. The mechanism assembly (
13
) is retained
to the body by 2 off M12 assembly studs (
18a
) and nuts (
18b
). These are located at the
opposite end to the float (
14
). It is also connected to the fixed bleed assembly via the pipe
support.
-
Unscrew the two assembly nuts (
18b
) and remove the mechanism assembly (
13
) and
assembly gasket (
19
).
-
To fit a new mechanism assembly (
13
) into the body (
1
) locate on to the two M12 assembly
studs (
18a
) and evenly tighten the 2 off M12 assembly nuts (
18b
) to the recommended
torque (see Table 1, page 20) having remembered to fit a new assembly gasket (
19
) to the
cleaned gasket faces.
-
Clean the gasket faces on the body (
1
) and the cover (
2
), fit a new cover gasket (
3
),
reposition the cover (
2
) and tighten the 14 off cover nuts (
5
) to the recommended torque
(see Figure 8, page 16) to reassemble the trap. The four shorter bolts should be fitted
at the outlet end of the trap where the cover flange is thinnest. A dowel in the body (
1
)
ensures that the cover (
2
) can only be assembled to the body (
1
) the correct way round.
