(a) Each packaging represented as created to your DOT specification or maybe a UN conventional must be marked on the non-removable part of your packaging with specification markings conforming for the applicable specification, and with the subsequent:
Force-retaining elements need to be discovered by any ideal method that doesn't compromise the integrity in the cylinder. Plates and billets for hotdrawn cylinders needs to be marked with the heat selection.
All spun cylinders and plugged cylinders have to be analyzed for leakage by gasoline or air pressure after the bottom has been cleaned and is particularly totally free from all dampness, matter to the subsequent conditions:
(two) A spun cylinder is just one wherein an conclusion closure in the completed cylinder has actually been welded via the spinning approach.
The minimum wall thickness need to be this sort of the wall worry at the least specified test pressure won't exceed 67 percent with the minimum tensile energy of your steel as based on the Bodily tests demanded in paragraphs (j) and (k) of the portion.
(four) Determine porosity of filling and tare weights; confirm compliance of marking with prescribed needs; acquire essential copies of steel shell studies; and furnish complete reports expected by this specification to the person who has accomplished the manufacture in the cylinders and, upon ask for, into the purchaser.
(iii) The bare minimum examination tension must be maintained no less than 30 seconds and sufficiently for a longer time to make sure total growth. Any interior strain used following heat-therapy and prior to the official examination might not exceed 90 % in the check tension.
(i) Nonflammable cryogenic liquids. Cylinders meant for use while in the transportation of nonflammable cryogenic liquid must have an outer jacket fabricated from metal or aluminum.
(one) Every single stress specimen need to have a gauge length of two inches having a width not exceeding a single and 1-fifty percent inches. Apart from the grip ends, the specimen might not be flattened. The grip finishes can be flattened to within just a single inch of every conclude in the diminished portion.
(iv) All straight threads must have at the least 6 engaged threads, a good suit, and an element of basic safety in shear of at the least ten within the examination pressure on the cylinder. Shear anxiety read more should be calculated by utilizing the suitable thread shear spot in accordance with NBS Handbook H-28.
Cylinders with bottoms shut in by spinning should be leakage analyzed by environment the inside air or fuel force at not lower than the assistance force. Any cylinder that leaks must be turned down.
A physical test needs to be performed to determine yield power, tensile toughness, and elongation as follows:
(1) Circumferential seams must be by brazing only. Heads must be attached to shells by the lap brazing method and need to overlap not under 4 occasions the wall thickness. Brazing content must have a melting issue of not lower than 1000 °File.
(two) Once the porosity of each cylinder will not be recognised, a cylinder taken at random from a lot of two hundred or fewer should be tested for porosity. If your exam cylinder fails, Each individual cylinder from the great deal may very well be tested independently and those cylinders that pass the take a look at are suitable.