(two) The design company temperature may be the coldest temperature for which a cylinder is acceptable. The required layout services temperatures for each cryogenic liquid is as follows:
Cylinders must be manufactured making use of equipment and procedures suitable to make certain that Every single cylinder created conforms to the requirements of this subpart. No defect is permitted that is likely to weaken the concluded cylinder appreciably. A reasonably sleek and uniform area end is needed. Heads may very well be hooked up to shells by lap brazing or might be fashioned integrally.
Cylinders need to be created utilizing equipment and procedures satisfactory in order that Every cylinder generated conforms to the requirements of this subpart and to the subsequent requirements:
Reheat cure is approved for turned down cylinders. Subsequent thereto, cylinders have to move all prescribed checks to become acceptable. Restore by welding or spinning will not be approved.
(one) Specimens has to be taken from one particular cylinder just after heat cure as illustrated in appendix A to this subpart, chosen at random from each great deal of 200 or much less, as follows:
A mechanical test must be done to ascertain produce energy, tensile energy, elongation as being a percentage, and reduction of spot of fabric to be a proportion as follows:
(2) Each individual opening in a very spherical type cylinder has to be offered by using a fitting, manager, or pad of weldable metal securely hooked up towards the container by fusion welding.
All spun cylinders and plugged cylinders should be analyzed for leakage by fuel or air pressure just after the bottom has long been cleaned and is cost-free from all humidity, subject to the following conditions and limits:
(3) A plugged cylinder is one through which a long term closure in the bottom of the finished cylinder has long been effected by a plug.
A specimen must be Slash from one cylinder of every lots of two hundred or considerably less, or even a welded exam plate. The welded take a look at plate should be of on the list of heats inside the large amount of two hundred or considerably less which it represents, in the same affliction and close to exactly the same thickness because the cylinder wall except that it may not be of the lesser thickness than that expected for 1 / 4 measurement Charpy impression specimen. The weld must be produced by the exact same processes and subjected to exactly the same heat remedy as the most important weld within the cylinder.
Cylinders with bottoms closed in by spinning should be leakage analyzed by environment the interior air or fuel strain at not less than the assistance strain. Any cylinder that leaks need to be turned down.
(ii) In utilizing the “extension below load” system, the whole strain (or “extension underneath load”) corresponding to the strain at which the 0.2 per cent permanent pressure takes place could possibly be determined with adequate accuracy by calculating the elastic extension with the gauge size underneath appropriate load and including thereto 0.
Cylinders must be created using products and procedures sufficient in order that Every single cylinder created conforms to check here the requirements of this subpart. No fissure or other defect is permitted that is likely to weaken the completed cylinder appreciably. A reasonably clean and uniform surface area finish is needed. Otherwise originally totally free from these defects, the area could be machined or otherwise treated to reduce these defects.
(1) Markings should be stamped plainly and permanently on shoulder or leading head of jacket or with a forever hooked up plate or head protective ring.