(iii) Getting a Licensed Verify Investigation on one particular cylinder out of each lots of two hundred cylinders or considerably less, if a certification containing knowledge to indicate compliance with the material specification is obtained.
The fabric need to be recognized by any ideal method besides that plates and billets For decent-drawn cylinders have to be marked with the warmth quantity.
Cylinders need to be made utilizing machines and procedures adequate to make sure that Each and every cylinder made conforms to the necessities of the subpart. No defect is permitted that is probably going to weaken the finished cylinder appreciably, a reasonably clean and uniform area end is needed.
(iii) Straight threads have to have at least four engaged threads, tight match and calculated shear strength a minimum of 10 instances the examination tension in the cylinder. Gaskets, which avoid leakage and so are inert into the harmful content, are expected.
(i) The word “spun” or “plug” has to be put close to the DOT specification marking when an conclude closure inside the concluded cylinder has long been welded through the spinning procedure, or effected by plugging.
(iv) Long-lasting volumetric growth may well not exceed 10 per cent of the overall volumetric enlargement at exam stress.
suggest the packaging identification markings required by this aspect such as, where by applicable, the identify and tackle or image with the packaging producer or approval agency.
Reheat treatment of turned down cylinders is authorized. Subsequent thereto, cylinders have to go all prescribed tests to become satisfactory. Maintenance of welded seams by welding is approved.
A specimen needs to be Slash from a single cylinder of each and every wide range of two hundred or considerably less, or welded test plate. The specimen must be taken from throughout the important seam website and should be ready and analyzed in accordance with and will have to satisfy the necessities of CGA Pamphlet C-3.
Welding or brazing for virtually any reason in any way is prohibited, apart from that welding by spinning is permitted to shut the bottom of spun cylinders. Machining or grinding to make good surface finish at level of closure is necessary.
(iii) The minimal exam strain needs to be managed no less than thirty seconds and adequately for a longer time to be certain finish growth. Any inner strain utilized right after warmth-treatment and before the Formal check might not exceed ninety p.c in the take a look at force.
Previous to the Preliminary cargo of any specific cylinder style, cyclic pressurization assessments will have to happen to be carried out on not less than 3 agent samples with no failure as follows:
Each cylinder must be uniformly and thoroughly heat addressed prior to tests. Any appropriate warmth remedy in excessive of 1100 °F is approved except that liquid quenching is not permitted. Warmth remedy need to be accomplished In any case forming and welding functions.
(one) Once the cylinders are warmth handled in a very batch furnace, two stress specimens and a few Charpy impression specimens need to be tested from among the cylinders or perhaps a take a look at ring from Every batch. The large amount measurement represented by these assessments may well not exceed two hundred cylinders.