A specimen needs to be faraway from one cylinder of every wide range of 200 or fewer, or welded test plate. The welded examination plate needs to be of on the list of heats from the lots of 200 or much less which it represents, in exactly the same situation and approximately a similar thickness as being the cylinder wall besides that in no circumstance ought to or not it's of the lesser thickness than that expected for a quarter sizing Charpy impression specimen. The weld has to be made by the same strategies and subjected to the same heat procedure as the key weld over the cylinder.
(i) The remaining cylinders in Every whole lot needs to be tested with the evidence pressure water-jacket or immediate enlargement test technique as prescribed in CGA C-1. The minimum test tension needs to be managed for the precise timeframe plus the screening equipment has to be calibrated as prescribed in CGA C-one.
(ii) Circumferential seams must be created by welding or by brazing. Heads attached by brazing need to have a driving suit Along with the shell Except the shell is crimped, swedged, or curled around the skirt or flange of the head and have to be completely brazed till total penetration via the brazing product from the brazed joint is secured. Depth of brazing from stop of the shell need to be no less than four (four) periods the thickness of shell metallic.
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(one) During this specification, a “good deal” indicates a group of cylinders successively made obtaining a similar:
(i) The remaining cylinders in Each individual great deal must be analyzed by the proof tension drinking water-jacket or direct growth exam method as prescribed in CGA C-one. The least take a look at stress have to be preserved for the particular timeframe and also the testing equipment has to be calibrated as prescribed in CGA C-1.
Cylinders must be created making use of gear and procedures enough to make certain that Each individual cylinder produced conforms to the necessities of this subpart. No fissure or other defect is permitted that is probably going to weaken the concluded container appreciably. The general surface complete may not exceed a roughness of 250 RMS. Individual irregularities for example attract marks, scratches, pits, and so on., ought to be held into a bare minimum in line with good significant strain pressure vessel manufacturing tactics.
(ii) The specimen, distinctive of grip finishes, will not be flattened. Grip ends might be flattened to within 1 inch of each close of your reduced segment. Heating of the specimen for almost any intent is not approved.
Cylinders has to be manufactured applying devices and processes sufficient to make sure that each cylinder produced conforms to the necessities of this subpart and to the next needs:
(i) The term “spun” or “plug” has to be put near the DOT specification marking when an conclude closure in the finished cylinder has actually been welded from the spinning course of action, or effected by plugging.
Just one container taken at random away from 200 or considerably less needs to be hydrostatically examined to destruction. Rupture pressure should be incorporated as Section of the inspector's report.
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(3) A plugged cylinder is more info one wherein a lasting closure in the bottom of the completed cylinder is effected by a plug.
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