(ii) Taper threads for being of size not fewer than as specified for American Regular taper pipe threads.
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(one) Stress, approximately the same as but no below support tension, have to be placed on 1 aspect on the completed base more than a place of no less than 1⁄16 of the total location of the bottom although not lower than three⁄4 inch in diameter, including the closure, for at least 1 moment, in the course of which period the opposite facet of the bottom subjected to stress must be covered with h2o and carefully examined for indications of leakage. Apart from as offered in paragraph (n) of this segment, cylinders that happen to be leaking need to be turned down.
(ii) In utilizing the “extension underneath load” process, the full pressure (or “extension less than load”) equivalent to the stress at which the 0.2 p.c lasting strain takes place may be determined with adequate precision by calculating the elastic extension from the gauge length under suitable load and incorporating thereto 0.
(one) Specimens have to be taken from one particular cylinder just after warmth remedy as illustrated in appendix A to this subpart, preferred at random from Each and every lot of two hundred or less, as follows:
Cylinders needs to be manufactured employing equipment and processes sufficient to ensure that Each individual cylinder generated conforms to the requirements of the subpart. No fissure or other defect is permitted that is likely to weaken the finished cylinder appreciably. A fairly easy and uniform surface end is required. If not originally free from these defects, the surface could possibly be machined or if not taken care of to get rid of these defects.
(ii) The check must be involving parallel metal plates on a press using a welded seam at right angles on the plates. Any projecting appurtenances may be cut off (by mechanical means only) just before crushing.
Reheat procedure of rejected cylinders is approved. Subsequent thereto, cylinders will have to pass all prescribed tests to generally be satisfactory. Mend of welded seams by welding is licensed.
Heads attached by brazing needs to have a driving fit While using the shell, Unless of course the shell is crimped, swedged, or curled over the skirt or flange of the head, and become totally brazed until finally total penetration via the brazing substance on the brazed joint is secured. Depth of brazing of your joint have to be no less than four (4) occasions the minimal thickness of shell metal.
(1) By most effective appliances and procedures. No defect is acceptable that is probably going to weaken the completed container appreciably. A fairly smooth and uniform surface area complete is needed.
(iv) Lasting volumetric enlargement may well not exceed 10 per cent of the full volumetric growth at take a look at stress.
(two) A spun cylinder is one particular where click here an stop closure within the concluded cylinder has been welded from the spinning process.
The seamless hemispheres and cylinders may very well be stress relieved or annealed for forming. Welded container should be tension relieved in a temperature of 775 °F ±twenty five° just after process treatment and prior to hydrostatic test.
(iii) For the goal of strain measurement, the First pressure reference have to be established whilst the specimen is underneath a tension of twelve,000 psi and also the strain indicator reading through getting established with the calculated corresponding pressure.