(iii) When dimensions of the cylinder isn't going to allow securing straight specimens, the specimens might be taken in almost any place or course and may be straightened or flattened cold by force only, not by blows.
(iii) Every single ligament which separates two openings have to be a minimum of thrice the standard with the diameters of The 2 openings.
(1) Force, approximately the same as but no below company stress, need to be placed on 1 aspect on the concluded base over an area of at the least one⁄sixteen of the full region of the bottom but not under 3⁄4 inch in diameter, including the closure, for a minimum of one minute, through which era one other facet of The underside subjected to tension must be covered with drinking water and intently examined for indications of leakage. Besides as furnished in paragraph (n) of this area, cylinders which happen to be leaking should be turned down.
Cylinders needs to be produced utilizing equipment and procedures sufficient to make certain that Every cylinder manufactured conforms to the necessities of the subpart. No defect is permitted that is likely to weaken the concluded cylinder appreciably.
(1) Until or else mentioned, if a sample cylinder or specimen taken from lots of cylinders fails the prescribed take a look at, then two further specimens needs to be chosen from the identical large amount and subjected for the prescribed exam. If either of such fails the check, then all the good deal must be turned down.
(1) Stress, about similar to although not fewer than service stress, has to be placed on just one facet with the concluded bottom over a location of at the least 1⁄sixteen of the whole area of The underside although not less than 3⁄four inch in diameter, such as the closure, for a minimum of just one moment, in the course of which era one other facet of The underside exposed to pressure must be lined with water and carefully examined for indications of leakage.
(iv) Everlasting volumetric expansion may well not exceed 10 p.c of the overall volumetric expansion at exam strain.
(iv) A brass fitting may be brazed on the steel boss or flange on cylinders utilized as part portions of handheld hearth extinguishers.
(3) Each specimen for The stress and Charpy impact assessments must be taken through the side wall of a cylinder or from a hoop which has been warmth treated Along with the finished cylinders of which the specimens have to be representative. The axis on the specimens must be parallel on the axis of your cylinder.
(two) Each opening inside the cylinder, except Those people for basic safety gadgets, must be provided having a fitting boss, or pad, securely attached to your cylinder by welding or by threads. If threads are utilised they must adjust to the next:
(iv) A brass fitting might be brazed to the metal manager or flange on cylinders employed as element parts of handheld fireplace extinguishers.
(two) A spun cylinder is one during which an conclusion closure in the finished cylinder is welded because of the spinning process.
(i) A gauge duration of at the very least 24 occasions the thickness which has a width not about six situations the thickness. The specimen, distinctive of grip ends, is probably not flattened. Grip ends may very well be flattened to within just a single inch of each and every conclude from the minimized area. When size of cylinder isn't going to permit securing straight specimens, the specimens can be taken in any site or path and could be straightened or flattened cold by tension only, not by blows.
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