(iv) Even more delivered that wall tension for cylinders obtaining copper brazed longitudinal seams may not exceed 95 percent of any of the above mentioned values. Calculated wall thickness may not contain galvanizing or other protective coating.
(iii) For the goal of pressure measurement, the Preliminary pressure need to be set when the specimen is under a stress of twelve,000 psi as well as pressure indicator reading staying set within the calculated corresponding pressure.
Reheat remedy is approved for turned down cylinders. Subsequent thereto, cylinders ought to move all prescribed tests being suitable. Repair by welding or spinning is not authorized.
Following strain screening, a flattening take a look at must be carried out on one particular cylinder taken at random out of every wide range of two hundred or much less by putting the cylinder involving wedge-formed knife edges having a 60 degree provided angle, rounded to your fifty percent-inch radius.
(i) Minimum thickness of heads and bottoms have to be not below ninety per cent on the essential thickness with the aspect wall.
(iv) Lasting volumetric enlargement might not exceed ten p.c of the total volumetric expansion at take a look at pressure.
(iv) Long term volumetric enlargement may not exceed ten p.c of the overall volumetric growth at examination pressure.
(B) With data specifying the kind(s) and dimensions on the closures, which includes gaskets and almost every other components necessary to make certain that the packaging is effective at efficiently passing the relevant efficiency checks. This data must incorporate any methods being adopted, which includes closure Guidance for internal packagings and receptacles, to effectively assemble and close the packaging for the goal of preventing leakage in transportation.
(two) Warmth remedy will not be demanded just after welding or brazing weldable lower carbon areas to attachments, laid out in paragraph (f)(one) of this section, of similar content that have been Earlier welded or brazed to the best or base of cylinders and adequately warmth handled, furnished these subsequent welding or brazing will not create a temperature in excess of 400 °File in almost any part of the very best or base materials.
(a) Each and every packaging represented as manufactured to some DOT specification or maybe a UN regular need to be marked with a non-removable get more info element in the packaging with specification markings conforming on the applicable specification, and with the subsequent:
(four) A take a look at cylinder or exam ring need to have characterize only one of many heats inside of a furnace batch presented one other heats within the batch have Earlier been tested and also have handed the assessments Which these types of tests do not depict more than 200 cylinders from any one heat.
Heads formed by drawing or urgent have to be uniformly and appropriately warmth dealt with just before checks. Cylinders with integral fashioned heads or bases have to be subjected to a normalizing Procedure.
Markings on each cylinder have to be by stamping plainly and permanently on shoulder, prime head, neck or valve protection collar which is completely hooked up towards the cylinders and forming an integral aspect thereof, offered that cylinders not fewer than 0.090 inch thick could be stamped to the facet wall adjacent to leading head.
(2) Each these types of 5,000 containers or significantly less, successively produced a day, shall constitute a lot and Should the test container shall fall short, the great deal shall be turned down or 10 additional containers may very well be chosen at random and subjected to the test underneath which failure transpired.