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(a) Each and every packaging represented as manufactured to some DOT specification or perhaps a UN conventional have to be marked over a non-detachable component in the packaging with specification markings conforming on the applicable specification, and with the next:

(one) Openings are permitted in heads only. They must be round and will not exceed 3 inches in diameter or a person third of your cylinder diameter, whichever is significantly less. Each and every opening during the cylinder should be provided which has a fitting, manager or pad, either integral with, or securely attached to, the cylinder body by fusion welding.

Cylinders should be made making use of equipment and procedures suitable making sure that Just about every cylinder manufactured conforms to the necessities of the subpart and to the subsequent needs:

Needs for the design, building, inspection and tests of moveable tanks intended for that transportation of refrigerated liquefied gases.

The cylinder should be manufactured of possibly metal or aluminum conforming to the subsequent requirements:

(ii) To determine the utmost longitudinal tensile worry resulting from bending, the following components should be utilised:

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All spun cylinders and plugged cylinders needs to be examined for leakage by fuel or air pressure right after The underside is cleaned which is free from all moisture. Tension, roughly similar to but no less than the support stress, should be applied to a single side in the finished bottom about a region of no less than one⁄sixteen of the whole region of the bottom although not lower than three⁄4 inch in diameter, including the closure, for at least one particular minute, for the duration of which period the other aspect of The underside subjected to stress need to be coated with water and closely examined for indications of leakage.

(1) Each cylinder need to be uniformly and properly warmth dealt with before take a look at with the relevant system referenced in table one of appendix A to this aspect. Heat cure needs to be accomplished All things considered forming and welding operations, apart from that when brazed joints are utilised, heat remedy must stick to any forming and welding operations, but could be accomplished just before, through or once the brazing functions (see paragraph (n) of the segment for weld repairs).

All spun cylinders and plugged cylinders needs to be analyzed for leakage by dry gasoline or dry air force just after The underside has actually been cleaned and is particularly free from all dampness, topic to the next circumstances and constraints:

(ii) In utilizing the “extension less than load” strategy, the whole strain (or “extension underneath load”) equivalent to the pressure at which the 0.two percent long-lasting pressure happens could be established with enough accuracy by calculating the elastic extension in the gauge length below correct load and incorporating thereto 0.

(iv) A brass fitting may be brazed for the steel manager or flange on cylinders applied as element portions of handheld hearth extinguishers.

Forms 304, 321 and 347 stainless-steel are authorized with correct welding process. A warmth of steel produced underneath the specifications in table 1 During this paragraph (b), Verify chemical Assessment of which is a little bit outside of the required variety, is acceptable, if satisfactory in all other respects, delivered the tolerances demonstrated in desk two Within this paragraph (b) are usually not exceeded, besides as authorized by Affiliate Administrator. The following chemical analyses are approved:

(2) Warmth treatment method will not be essential after welding or brazing weldable small carbon elements to attachments, specified in paragraph (f)(one) of the area, of comparable product which have been Formerly welded or brazed to the very best or bottom of cylinders and properly heat treated, offered these kinds of subsequent welding or brazing isn't going to create a temperature get more info in extra of 400 °F in any Component of the highest or base content.