(iv) More provided that wall stress for cylinders having copper brazed longitudinal seams may not exceed 95 per cent of any of the above values. Calculated wall thickness may well not include things like galvanizing or other protecting coating.
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(3) A plugged cylinder is 1 in which a long lasting closure in The underside of the finished cylinder continues to be effected by a plug.
(ii) A single cylinder must be selected from Every single ton and become hydrostatically strain tested to destruction. If this cylinder bursts beneath 5 (5) occasions the assistance pressure, then two more cylinders with the exact same lot as the Beforehand analyzed cylinder needs to be selected and subjected to this examination.
(2) If the cylinders are heat treated inside a constant furnace, two stress specimens and three Charpy influence specimens have to be examined from one of the cylinders or possibly a check ring from Each individual four hrs or much less of manufacturing. Even so, in no case may perhaps a exam whole lot according to this output time period exceed 200 cylinders.
(iii) For the purpose of pressure measurement, the Preliminary strain need to be set when the specimen is underneath a worry of twelve,000 psig along with the strain indicator looking at must be established with the calculated corresponding strain.
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(iv) Long lasting volumetric expansion may not exceed 10 p.c of the overall volumetric enlargement at test tension.
(2) Warmth cure is not needed soon after welding or brazing weldable low carbon elements to attachments, laid out in paragraph (file)(1) of this part, of similar materials which have been previously welded or brazed to the best or base of cylinders and adequately heat taken care of, offered this kind of subsequent welding or brazing would not deliver a temperature in extra of 400 °File in almost any part of the very best or bottom product.
Products have to be identified by any acceptable system except that plates and billets for hot-drawn containers must be marked with the heat variety.
(one) Marking on Each individual cylinder needs to be stamped plainly and forever on or close to the shoulder, leading head, neck or valve defense collar which happens to be forever hooked up to your cylinder and forming integral element thereof.
(2) A spun cylinder is a single wherein an stop closure from the completed cylinder has become welded via the spinning approach.
(ii) In using the “extension underneath load” strategy, the whole pressure (or “extension underneath load”) read more equivalent to the anxiety at which the 0.2 p.c long lasting pressure takes place may very well be identified with sufficient accuracy by calculating the elastic extension from the gauge length under acceptable load and including thereto 0.
(two) If an indication of the identify from the manufacturer or other identification of the packaging as specified by the qualified authority is needed, the title and address or symbol with the manufacturer or perhaps the acceptance company certifying compliance Together with the UN normal must be entered. Symbols, if employed, needs to be registered With all the Associate Administrator.