Replacement Of The Bent Tube Assembly - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

The bent tube (117b) must be free of dents. If the
Band Mask has been used for burning (underwa-
ter cutting) jobs, carefully check for erosion of
the metal. Replace tube if necessary.
6.9.4 Replacement of the Bent
Tube Assembly (119b)
1) It may be necessary to loosen the demand
regulator mount nut (8) before installing a new
bent tube assembly (119b). This may need to be
done for alignment when starting the mount nut
onto the side block (94b).
2) After loosening the mount nut (8), lightly
lubricate the O-ring with silicone lubricant and
push the O-ring end of the bent tube assembly into
the regulator inlet nipple (61b). Slide it in until
the side block (94b) end is aligned with the
threads for the mount nut.
Fig. 6.46 You will probably need to loosen the regulator
mount nut to position the bent tube.
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KMB 18 & 28 MANUAL
3) Be sure the Teflon O-ring (116b) is in place.
4) Start to tighten the bent tube assembly (119b)
mount nut on the side block end.
5) Next, tighten the regulator mount nut (8)
securing the regulator to the Band Mask frame
(17).
6) Start the bent tube mount nut onto the inlet
nipple (61b). Run it in HAND TIGHT ONLY.
7) Tighten the side block end nut.
8) Hold the nut on the end of the bent tube (117b)
with a wrench and tighten the jam nut (61c) to the
correct torque against it with another wrench. The
jam nut must not be bottomed out against the
nipple (61b).
Fig. 6.47 Tightening the jam nut.
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