SERVICE MANUAL
Page 521
CHAPTER 5
9107
May/12
CHAPTER 5
Page 521
Feb/11
283
SERVICE MANUAL
ISO 9650
WARNING:
A CHARGED CYLINDER SHOWING LOSS OF WEIGHT,
CANNOT BE USED IN SERVICE.
CAUTION:
FOR THESE TESTS ONLY USE THE LEAK DETECTION
TEST KIT AS LISTED IN CHAPTER 10.
(b) Lay the cylinder to be tested on its side, in a rack, so that
the valve end is protruding, (FIGURE 510). Ensure the valve
and shoulder of the cylinder are free from dust and other
contaminates by carefully wiping using a clean, dry cloth.
Remove the dust cap to clean the valve then replace the cap
loosely.
(c) Using the measuring cylinder provided in the test kit, transfer
25ml of the test solution into a polythene bag. The initial color
of the test solution will be a pink color.
(d) Attach the open end of the bag over valve head and attach it to
the cylinder body using one or more elastic bands. Make sure
there are no air gaps in the seal, (FIGURE 510).
(e) The polythene bag shall then hang 20 cm off the valve end of
the cylinder with the test solution in one corner.
(f) (Maintain the test for a period of
not less
than one hour.
Remove the bag, (ends closed), and gently shake the solution.
Make the observation as detailed below.
Alternatively the bag can be shaken while still hanging from the
cylinder.
(g) A control sample is necessary, this is made by introducing 25ml
of test solution into a bag which is not f
i
tted to a cylinder, but
must be sealed at the open end, to exclude contamination from
the atmosphere. This bag
must be placed on the rack in the
vicinity of the cylinders under test, and the above test method
applied.
