Top bar 178 Secrets
Top bar 178 Secrets
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The attachment towards the tops and bottoms only of cylinders by welding of neckrings, footrings, handles, bosses, pads and valve safety rings is authorized offered that these types of attachments along with the portion of the container to which They can be hooked up are created of weldable metal, the carbon content material of which may not exceed 0.twenty five %.
(2) Heat remedy just isn't needed once the welding or brazing of weldable minimal carbon pieces to attachments of similar content which have been Earlier welded or brazed to the top or base of cylinders and correctly warmth treated, offered these kinds of subsequent welding or brazing won't create a temperature in extra of four hundred °File in any part of the highest or bottom content.
(ii) A person cylinder have to be picked from Each individual lot and become hydrostatically stress examined to destruction. If this cylinder bursts under 5 (five) times the support strain, then two extra cylinders with the similar whole lot because the previously examined cylinder have to be chosen and subjected to this exam.
Repairs of rejected cylinders is authorized. Cylinders which are leaking need to be turned down, apart from that:
Markings on Every single cylinder has to be by stamping plainly and permanently on shoulder, top head, neck or valve safety collar and that is forever hooked up to the cylinders and forming an integral section thereof, presented that cylinders not fewer than 0.090 inch thick can be stamped around the side wall adjacent to best head.
(4) Identify porosity of filling and tare weights; validate compliance of marking with prescribed prerequisites; attain needed get more info copies of metal shell studies; and furnish entire reviews expected by this specification to the one that has done the manufacture with the cylinders and, on request, on the purchaser.
(ii) Just one specimen needs to be taken from possibly head on a cylinder when both equally heads are created of the exact same substance. Having said that, if the two heads are made of differing components, a specimen needs to be taken from Every head.
(one) No defect is permitted that is probably going to weaken the finished cylinder appreciably. A fairly clean and uniform floor finish is needed. The shell part has to be a reasonably legitimate cylinder.
(1) Every single tension specimen must have a gauge size of two inches using a width not exceeding a person and just one-50 % inches. Aside from the grip finishes, the specimen will not be flattened. The grip ends may very well be flattened to in one inch of each and every stop with the minimized portion.
(ii) The minimal exam strain must be preserved a minimum of 30 seconds and sufficiently for a longer period to be sure finish expansion. Any inner pressure utilized just after warmth-treatment and former on the Formal check may not exceed 90 p.c in the take a look at stress.
(3) For filling that may be molded and dried just before insertion in cylinders, porosity examination could be produced on a sample block taken at random from product for use.
(two) A company of a packaging subject to the requirements of this aspect is mostly responsible for compliance with the requirements of this portion. Nonetheless, any person who performs a perform prescribed In this particular portion shall conduct that functionality in accordance with this portion.
(2) Verify compliance of cylinder shells with all shell prerequisites, inspect inside of right before closing in each finishes, verify heat treatment method as good; get all samples for all exams and for check analyses, witness all exams; verify threads by gauge, report volumetric ability and bare minimum thickness of wall famous.
(six) Other markings are authorized supplied They are really manufactured in reduced stress parts besides the aspect wall and they are not of a dimensions and depth that will make unsafe strain concentrations. These marks might not conflict with any DOT necessary markings.