(a) Each and every packaging represented as produced into a DOT specification or even a UN typical needs to be marked on a non-removable ingredient of the packaging with specification markings conforming towards the applicable specification, and with the following:

(one) Every single cylinder must be uniformly and adequately heat taken care of before test with the applicable system revealed in desk 1 of appendix A to this section. Warmth therapy has to be achieved In any case forming and welding operations, other than that when brazed joints are made use of, heat treatment will have to observe any forming and welding operations, but may very well be carried out just before, for the duration of or once the brazing operations (see paragraph (m) of the section for weld repairs).

(one) The outcome in the test should conform to at least the minimum amount appropriate mechanical house limitations for aluminum alloys as specified in paragraph (b) of the area.

(ii) Circumferential seams need to be made by welding or by brazing. Heads connected by brazing needs to have a driving match Along with the shell unless the shell is crimped, swedged, or curled in excess of the skirt or flange of The pinnacle and must be extensively brazed right up until entire penetration by the brazing substance of your brazed joint is secured. Depth of brazing from end from the shell has to be at the least 4 (four) situations the thickness of shell metal.

(1) Specimens should be taken from just one cylinder after heat remedy as illustrated in appendix A to this subpart, preferred at random from each great deal of two hundred or much less, as follows:

Reheat remedy of rejected cylinders is approved a single time. Subsequent thereto, cylinders ought to go all prescribed checks to generally be appropriate.

(one) All seams with the cylinder needs to be fusion welded. A means should be presented for carrying out finish penetration of your joint. Only butt or joggle butt joints with the cylinder seams are licensed. All joints within the cylinder should have fairly real alignment.

(iii) When size get more info with the cylinder would not permit securing straight specimens, the specimens could be taken in any spot or course and could be straightened or flattened cold by stress only, not by blows.

The completed containers has to be uniformly and appropriately warmth-dealt with previous to assessments. Warmth-cure of containers with the authorized analysis should be as follows:

(ii) The filling content should be uniform in quality and freed from voids, besides that a well drilled into the filling product beneath the valve is authorized In the event the very well is stuffed with a material of these types of form that the capabilities with the filling materials are not impaired;

(ii) The take a look at have to be on the weld between the parallel metal plates on the push which has a welded seam, at appropriate angles towards the plates. Any projecting appurtenances may be Slash off (by mechanical signifies only) before crushing.

Each individual cylinder, before insulating and jacketing, must successfully withstand a pressure examination as follows:

(ii) In utilizing the “extension less than load” system, the whole strain (or “extension under load”) similar to the worry at which the 0.two-percent permanent pressure happens could possibly be established with sufficient precision by calculating the elastic extension on the gauge length less than ideal load and including thereto 0.

The phrase “stress of contents” as utilized On this specification implies the whole strain of each of the components for being shipped within the cylinder.