Open hearth or electric furnace metal of uniform top quality has to be employed. A heat of steel produced beneath the specs mentioned in Desk one With this paragraph (b), a Look at chemical Assessment that is certainly a little bit outside of the required selection is acceptable, if satisfactory in all other respects, supplied the tolerances demonstrated in Desk 2 With this paragraph (b) are not exceeded.
(two) Confirm compliance of cylinder shells with all shell necessities; inspect within ahead of closing in both of those finishes; confirm warmth therapy as correct; acquire all samples for all tests and for Test analyses; witness all exams; validate threads by gauge; report volumetric capacity and minimum amount thickness of wall mentioned.
The finished cylinders needs to be uniformly and adequately warmth addressed before assessments. Warmth treatment of cylinders of your authorized analyses need to be as follows:
(two) A plugged cylinder is 1 where a lasting closure in The underside of a completed cylinder has become effected by a plug.
(one) Specimens should be taken from one cylinder after heat treatment as illustrated in appendix A to this subpart, decided on at random from each great deal of 200 or much less, as follows:
(iii) For the objective of strain measurement, the initial pressure must be set even though the specimen is less than a pressure of twelve,000 psig as well as the strain indicator looking through need to be set within the calculated corresponding pressure.
(1) No defect is permitted that is likely to weaken the finished cylinder appreciably. A reasonably smooth and uniform floor is necessary.
Reheat remedy of rejected cylinders is licensed. Subsequent thereto, cylinders have to go all prescribed exams to be satisfactory. Maintenance of welded seams by welding is licensed.
(three) A plugged cylinder is one during which a long lasting closure in The underside of a completed cylinder has become effected by a plug.
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(five) Each new design and any major adjust to any acceptable design and style should be competent for creation by tests prototype samples as follows:
(ii) Taper threads for being of duration not click here a lot less than as specified for American Conventional taper pipe threads.
Cylinders have to be made working with machines and processes satisfactory to make sure that Every single cylinder generated conforms to the necessities of this subpart. No fissure or other defect is permitted that is probably going to weaken the finished cylinder appreciably. A reasonably clean and uniform surface end is needed. Otherwise initially absolutely free from this kind of defects, the surface area could possibly be machined or or else taken care of to do away with these defects.
Inspection have to be executed on the inside of each and every container right before closing and externally on each concluded container after warmth treatment method.