(a) Each packaging represented as manufactured to your DOT specification or even a UN common have to be marked over a non-detachable part with the packaging with specification markings conforming to your relevant specification, and with the following:
(i) Performing or witnessing the efficiency with the chemical analyses on Just about every soften or cast good deal or other unit of starting up materials; or
The restricting chemical composition of steel approved by this specification has to be as demonstrated in table I of appendix A to this aspect.
(three) A plugged cylinder is a person in which a long term closure in The underside of the finished cylinder continues to be effected by a plug.
(2) Cylindrical kind cylinder models has to be of circumferentially welded or brazed development; longitudinally brazed or silver-soldered seams also are permitted.
(ii) Taper threads to become of duration not fewer than as specified for American Common taper pipe threads.
(iii) For the objective of strain measurement, the initial pressure must be established although the specimen is under a anxiety of twelve,000 psi and the pressure indicator looking through staying set within the calculated corresponding strain.
System and heads formed by drawing or urgent need to be uniformly and thoroughly heat taken care of just before exams.
Materials should be identified by any suited strategy, except that plates and billets For decent-drawn cylinders should be marked with the warmth range.
A specimen needs to be Slice from a person cylinder of each and every large amount of two hundred or considerably less, or welded take a look at plate. The welded examination plate needs to be of among the heats within the number of 200 or much less which it signifies, in exactly the same situation and around the same thickness given that the cylinder wall apart from that it might not be of the lesser thickness than that demanded for 1 / 4 sizing Charpy influence specimen. The weld has to be made by the identical treatments and subjected to the exact same heat treatment method as the foremost weld over the cylinder.
The completed cylinders have to be uniformly and properly heated prior to checks. Warmth treatment method of the cylinders from the approved Investigation have to be as follows:
Chemical analyses and checks necessary by this subchapter needs to be made inside The usa, Unless of course if not accepted in producing via the Associate Administrator, in accordance with subpart I of component website 107 of this chapter. Inspections and verification must be executed by—
(1) Welding or brazing is approved for that attachment of neckrings and footrings which happen to be non-tension sections, and only to your tops and bottoms of cylinders using a provider stress of five hundred psig or a lot less.
(iii) If the size of a cylinder will not allow securing straight specimens, the specimens may be taken in any place or course and could be straightened or flattened cold, by force only, not by blows.