Reheat treatment is authorized for rejected cylinders. Subsequent thereto, cylinders will have to pass all prescribed checks for being acceptable. Repair service by welding or spinning is just not licensed.
(one) Except in any other case said, if a sample cylinder or specimen taken from lots of cylinders fails the prescribed check, then two more specimens has to be selected from the identical lot and subjected towards the prescribed examination. If possibly of these fails the examination, then the complete whole lot need to be turned down.
(iii) For the purpose of strain measurement, the Original pressure need to be established even though the specimen is beneath a worry of twelve,000 psi and the strain indicator reading becoming established with the calculated corresponding pressure.
A DOT 4D cylinder is often a welded steel sphere (two seamless hemispheres) or circumferentially welded cylinder (two seamless drawn shells) having a h2o capability not in excess of 100 kilos along with a service force of at least 300 although not in excess of five hundred psig. Cylinders closed in by spinning course of action are usually not approved.
(2) Cylindrical sort cylinder patterns has to be of circumferentially welded or brazed building; longitudinally brazed or silver-soldered seams can also be permitted.
(four) Establish porosity of filling and tare weights; validate compliance of marking with prescribed requirements; get necessary copies of steel shell studies; and furnish entire reviews required by this specification to the person who has concluded the manufacture of your cylinders and, upon request, to the purchaser.
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(2) The dimensions of any centered opening in a very head may well not exceed a single 50 % the outside diameter from the cylinder.
(iii) For the objective of strain measurement, the Original pressure need to be set while the specimen is below a anxiety of twelve,000 psi, as well as pressure indicator looking at have to be established at the calculated corresponding strain.
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The finished cylinders needs to be uniformly and correctly heated ahead of checks. Warmth remedy of your cylinders on the authorized Evaluation need to be as follows:
(i) If the chosen cylinder passes the water-jacket or direct growth examination, the remaining cylinders in Just about every ton has to be force tested because of the evidence tension drinking water-jacket or direct growth check strategy as prescribed in CGA C-one.
(ii) In utilizing the “extension less than load” strategy, the entire pressure (or “extension less than load”) similar to the anxiety at which the 0.2 p.c long lasting pressure happens might be decided with sufficient precision by calculating the elastic extension of the gauge length underneath suitable load and introducing thereto 0.
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