(iv) Lasting volumetric growth may not exceed 10 per cent of the entire volumetric growth at check strain.
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(three) A plugged cylinder is just one during which a permanent closure in The underside of a concluded cylinder has become effected by a plug.
Reheat remedy is authorized for just a rejected cylinder in accordance using this type of paragraph (m). Right after reheat, a cylinder must go all prescribed checks in this area for being satisfactory. Repair of brazed seams by brazing and welded seams by welding is considered authorized.
(iii) For the purpose of pressure measurement, the Preliminary strain has to be established even though the specimen is beneath a tension of 12,000 psi and the strain indicator reading through getting established with the calculated corresponding pressure.
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(iii) The minimum examination tension needs to be maintained at the least 30 seconds and sufficiently extended to be certain complete enlargement. Any inner strain utilized soon after warmth-procedure and ahead of the official test may not exceed 90 per cent in the test stress.
The metal Utilized in the construction with the cylinder have to be as specified in table one of appendix A to this component. The cylinder producer need to keep a record of deliberately additional alloying factors.
A specimen needs to be Minimize from 1 cylinder of every great deal of 200 or considerably less, or a welded examination plate. The welded exam plate have to be of among the list of heats during the lots of 200 or much less which it signifies, in precisely the same condition and roughly the identical thickness as the cylinder wall besides that it is probably not of the lesser thickness than that expected for 1 / 4 sizing Charpy affect specimen. The weld need to be made by precisely the same processes and subjected to the identical heat treatment method as the most important weld on the cylinder.
(iii) Straight threads, acquiring at the least four engaged threads, to get limited fit and calculated shear power at the least ten times the test tension of your container; gaskets demanded, ample to forestall leakage.
Each and every cylinder, prior to insulating and jacketing, will have to efficiently face up to a tension test as follows:
(ii) Taper threads need to more info be of the length not under as specified for American Conventional taper pipe threads.
(iii) The minimum amount take a look at stress needs to be preserved at the least 30 seconds and adequately lengthier to be certain comprehensive enlargement. Any inside tension utilized just after heat-procedure and just before the Formal check may well not exceed 90 per cent from the exam stress.