(2) Just about every this kind of 5,000 containers or much less, successively developed per day, shall constitute a lot and if the check container shall are unsuccessful, the good deal shall be rejected or ten more containers could possibly be picked at random and subjected to the examination underneath which failure happened.

(two) A spun cylinder is just one in which an end closure inside the finished cylinder is welded because of the spinning procedure.

All spun cylinders and plugged cylinders needs to be examined for leakage by fuel or air strain right after The underside is cleaned and is also cost-free from all moisture, matter to the next situations:

Reheat treatment of turned down cylinders is authorized. Subsequent thereto, cylinders should go all prescribed exams being appropriate. Repair service of welded seams by welding is licensed.

(iii) When measurement of cylinder isn't going to allow securing straight specimens, the specimens may very well be taken in almost any spot or way and may be straightened or flattened chilly by pressure only, not by blows.

(iii) The minimal exam stress need to be taken care of not less than 30 seconds and sufficiently lengthier to make sure total expansion. Any inside pressure utilized soon after warmth-therapy and ahead of the official take a look at may well not exceed ninety % with the check force.

(one) Cylinders should be marked by minimal tension style metal stamping in a place and also to a depth that can insure that the wall thickness calculated through the root of your stamping to the interior surface area is equal to or increased when compared to the minimal prescribed wall thickness. Stamping have to be lasting and legible. Stamping on side wall not authorized.

(five) Every new design and style and any major transform to any appropriate layout need read more to be capable for generation by testing prototype samples as follows:

(iii) The minimum amount check force should be taken care of at the least thirty seconds and adequately for a longer time to make sure entire growth. Any interior tension used soon after warmth-therapy and just before the official take a look at may not exceed ninety per cent of your examination tension.

(iii) Make copies of all composed notifications readily available for inspection by a agent in the Department.

(three) For filling which is molded and dried ahead of insertion in cylinders, porosity take a look at may be built on the sample block taken at random from content for use.

(iv) A brass fitting could be brazed into the metal boss or flange on cylinders utilised as ingredient areas of handheld fireplace extinguishers.

(2) The inspector will have to confirm ultrasonic inspection of all substance by inspection or by getting the material producer's certificate of ultrasonic inspection. Ultrasonic inspection need to be done or verified as possessing been performed in accordance with paragraph (b)(5) of this section.

(iv) Permanent volumetric enlargement might not exceed 10 per cent of the whole volumetric expansion at exam strain.