(one) No defect is permitted that is likely to weaken the completed cylinder appreciably. A reasonably clean and uniform area finish is required. The shell part need to be a reasonably legitimate cylinder.
(d) No man or woman may perhaps mark or otherwise certify a packaging or container as meeting the requirements of a production special allow Unless of course that particular person is the holder of or a party to that Particular permit, an agent in the holder or occasion for the objective of marking or certification, or perhaps a third party tester.
A Actual physical examination must be carried out to determine produce strength, tensile toughness, and elongation as follows:
(ii) In utilizing the “extension beneath load” strategy, the overall pressure (or “extension less than load”) similar to the anxiety at which the 0.two per cent permanent strain occurs can be identified with ample precision by calculating the elastic extension from the gauge length below acceptable load and adding thereto 0.
Restore of welded seams by welding just before process treatment is licensed. Subsequent thereto, containers must be warmth addressed and move all prescribed tests.
(3) A plugged cylinder is one particular wherein a long-lasting closure in the bottom of a completed cylinder has long been effected by a plug.
Reheat remedy of rejected cylinders is licensed. Subsequent thereto, cylinders will have to pass all prescribed tests to be suitable. Welds may check here be repaired by suitable ways of fusion welding.
(ii) In utilizing the “extension less than load” approach, the overall pressure (or “extension under load”) equivalent to the worry at which the 0.two percent long-lasting pressure takes place can be decided with enough accuracy by calculating the elastic extension in the gauge size less than proper load and including thereto 0.
(two) The size of any centered opening within a head may not exceed just one half the outside diameter of your cylinder.
In combination with the knowledge needed by § 178.35, the record of chemical analyses have to also include things like the alloy designation, and relevant information on iron, titanium, zinc, magnesium and some other relevant component Employed in the construction of your cylinder.
(iii) The minimum amount take a look at force must be preserved not less than thirty seconds and sufficiently longer to guarantee finish enlargement. Any internal stress utilized just after heat-treatment method and just before the Formal check may well not exceed 90 per cent in the exam pressure.
Notwithstanding the variation provided Within this paragraph, Just about every container ought to if not conform to your DOT 2Q container in accordance with § 178.33a. The next conditions also utilize beneath Variation one—
(ii) In using the “extension below load” strategy, the overall strain (or “extension less than load”) corresponding to the stress at which the 0.two percent permanent pressure takes place may very well be identified with ample precision by calculating the elastic extension from the gauge size under appropriate load and including thereto 0.
Just one concluded cylinder selected at random out of each number of five hundred or fewer successively developed should be hydrostatically tested to 4