Cylinders has to be made utilizing tools and procedures enough to make certain Each and every cylinder made conforms to the necessities of this subpart. No defect is permitted that is probably going to weaken the completed container appreciably.
Ahead of any test, all cylinders have to be subjected to an answer heat remedy and ageing treatment suitable for the aluminum alloy made use of.
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(ii) The porous filling product must be uniform in high quality and freed from voids, besides that a properly drilled in the filling materials beneath the valve is authorized if the very well is filled with a material of these sort the features of the filling materials are not impaired;
(three) For filling that is molded and dried just before insertion in cylinders, porosity examination could be designed on sample block taken at random from substance for use.
(two) When the porosity of each and every cylinder just isn't acknowledged, a cylinder taken at random from loads of two hundred or fewer must be analyzed for porosity. When the check cylinder fails, Every single cylinder during the large amount could be tested independently and people cylinders that move the test are satisfactory.
Two test specimens cut from 1 cylinder representing each large amount of two hundred cylinders or significantly less has to be subjected towards the mechanical Attributes test, as follows:
(one) Welding or brazing is authorized for the attachment of neckrings and footrings which might be non-tension areas, and only on the tops and bottoms of cylinders having a provider force of 500 psig or less.
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(4) As a security precaution, When the maker elects to generate this test before the hydrostatic test, he should design and style his apparatus so the stress is applied to the smallest region practicable, within the level of closure, and so as to utilize the smallest possible volume click here of air or gas.
(iii) For the objective of pressure measurement, the First strain has to be established even though the specimen is beneath a tension of 12,000 psi and also the pressure indicator looking at getting set on the calculated corresponding strain.
Substance needs to be recognized by any suitable approach except that plates and billets For warm-drawn cylinders must be marked with warmth amount.
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signifies the individual whose title and deal with or symbol appears as A part of the specification markings needed by this section or, for a packaging marked Together with the symbol of the acceptance company, the individual on whose behalf the acceptance company certifies the packaging.