Markings needs to be stamped plainly and completely over a permanent attachment or on the steel nameplate forever secured towards the container by suggests in addition to gentle solder.

(two) Warmth cure is just not essential after the welding or brazing of weldable reduced carbon pieces to attachments of comparable substance that have been Formerly welded or brazed to the best or base of cylinders and properly warmth treated, offered this kind of subsequent welding or brazing doesn't produce a temperature in excess of four hundred °F in any part of the top or base substance.

Cylinders need to be produced making use of equipment and processes suitable to make certain Every cylinder created conforms to the requirements of this subpart also to the next specifications:

All spun cylinders and plugged cylinders should be examined for leakage by gasoline or air pressure soon after the bottom has long been cleaned and it is absolutely free from all humidity. Pressure, roughly the same as but no less than the support force, have to be placed on just one aspect of your concluded bottom about a place of not less than 1⁄16 of the overall spot of The underside although not a lot less than three⁄four inch in diameter, including the closure, for at least one particular minute, through which era the other side of The underside subjected to stress needs to be covered with h2o and carefully examined for indications of leakage.

Strain-retaining components has to be recognized by any appropriate technique that does not compromise the integrity with the cylinder. Plates and billets for hotdrawn cylinders must be marked with the heat number.

Cylinder heads, bodies or the completed cylinder, fashioned by drawing or urgent, have to be uniformly and correctly warmth treated by an relevant method demonstrated in desk 1 of appendix A of this section prior to checks.

(iii) For the goal of strain measurement, the Original strain have to be established though the specimen is beneath a stress of twelve,000 psi, and the strain indicator looking at must be established for the calculated corresponding strain.

(iii) When the dimensions of a cylinder isn't going to permit securing straight specimens, the specimens can be taken in any location or way and will be straightened or flattened chilly, by stress only, not by blows.

(iii) The bare minimum examination pressure have to be maintained no less than 30 seconds and sufficiently extended to be certain total growth. Any interior tension applied following heat-treatment method and ahead of the Formal check may not exceed ninety percent from the examination force.

(three) Name plates are licensed, offered that they can be completely and securely hooked up on the cylinder. Attachment by either brazing or welding is not really permitted. Attachment by soldering is permitted presented metal temperature isn't going to exceed 500 °File.

(iii) The minimal check pressure should be taken care of not less than thirty seconds and adequately more time to make sure total expansion. Any inside tension utilized right after heat-therapy and before the Formal examination might not exceed 90 p.c on the examination stress.

Notwithstanding the variation delivered During this paragraph, each container must otherwise conform to a DOT 2Q container in accordance with § 178.33a. The following website conditions also utilize less than Variation one—

Markings on each cylinder has to be by stamping plainly and forever on shoulder, top head, neck or valve security collar which is completely connected into the cylinders and forming an integral component thereof, offered that cylinders not lower than 0.090 inch thick may be stamped about the facet wall adjacent to leading head.

(ii) The filling product must be uniform in high quality and free of voids, except that a nicely drilled in to the filling material beneath the valve is authorized When the nicely is full of a material of this kind of kind that the functions of your filling materials are not impaired;