SERVICE MANUAL
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CHAPTER 4
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CHAPTER 4
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SERVICE MANUAL
ISO 9650
2.1.10 The external condition of the cylinder must be checked in accordance
with British Standard 5430 Pt.2. This standard gives the limits for
surface damage. If the damage is more than the limits, reject the
cylinder. The standard gives the following conditions for rejection
and destruction of a cylinder:
(a) Visible swelling of a cylinder.
(b) A dent which is deeper than 2 mm.
(c) A dent which has a diameter of less than 30 times its depth.
(d) A cut or gouge which is more than 2% of the cylinder length.
(e) A cut /gouge which is deeper than 5% of the cylinder wall
thickness.
(f) A crack in the metal.
(g) Any delamination of the metal.
(h) The wear of the base end of the cylinder has reduced the
thickness to less than 75% of the original.
(i) Heat damage has caused burning of the metal or distortion of
the cylinder.
(j) Stamp marks have been made by a metal punch on the parallel
section of the cylinder.
(k) Stamp marks are illegible.
2.1.11 Cylinders that have been submerged in water, i.e. those attached
to liferafts that have been used in an actual emergency, must
be hydraulically tested. They should be returned to the cylinder
manufacturer (or an approved agent) for reconditioning and re-test
before reuse.
2.1.12 Examine hoses, inlet valves and top-up valves for visual defects.
Make sure all components are correctly attached.