(i) The remaining cylinders in Every single lot must be analyzed because of the proof force, h2o-jacket, or immediate enlargement exam system as prescribed in CGA C-one. The least take a look at strain has to be preserved for the specific timeframe and the testing equipment have to be calibrated as prescribed in CGA C-one.
(iii) For the objective of pressure measurement, the Preliminary strain need to be set even though the specimen is under a tension of twelve,000 psi plus the strain indicator reading remaining set on the calculated corresponding pressure.
(two) Every cylinder ought to fulfill the subsequent supplemental necessity which assumes a cylinder horizontally supported at its two ends and uniformly loaded above its complete size.
This examination might be utilised and must be as expected by CGA Pamphlet C-3. The specimen need to be bent right up until the elongation at the outer surface area, adjacent to the foundation in the weld, amongst the flippantly scribed gage lines-a to b, is at the least 20 %, besides that this percentage might be reduced for steels using a tensile power in excess of fifty,000 psi, as presented in paragraph (k) of this segment.
(iii) The next components have to be accustomed to calculate the maximum longitudinal tensile stress due to hydrostatic take a look at force:
A DOT 4D cylinder is actually a welded steel sphere (two seamless hemispheres) or circumferentially welded cylinder (two seamless drawn shells) by using a h2o potential not around 100 lbs . plus a assistance force of at the very bar178 slot least three hundred but not over five hundred psig. Cylinders shut in by spinning approach are certainly not approved.
(1) No defect is permitted that is probably going to weaken the concluded cylinder appreciably. A fairly smooth and uniform surface is needed.
All spun cylinders and plugged cylinders have to be tested for leakage by gasoline or air pressure following The underside is cleaned and it is totally free from all moisture issue to the next disorders and limits:
Ends: The best on the container has to be made using a force reduction process consisting of radial scores on the top seam(s). The bottom of the container should be created to buckle in a pressure increased when compared to the force at which the best buckles and vents.
Welding or brazing for virtually any purpose whatsoever is prohibited, besides that welding by spinning is permitted to close the bottom of spun cylinders. Machining or grinding to create good area complete at level of closure is required.
Markings on each container needs to be stamped plainly and forever with a long term attachment or on the metal nameplate completely secured towards the container by signifies other than comfortable solder.
(ii) In using the “extension underneath load” method, the overall strain (or “extension under load”) comparable to the pressure at which the 0.2 p.c lasting strain takes place may very well be identified with enough precision by calculating the elastic extension on the gauge duration under proper load and adding thereto 0.
(iii) With a cylindrical part of the shell that extends further than the recessed bottom from the cylinder, constituting an integral and non-pressure Component of the cylinder;
Notwithstanding the variation presented On this paragraph, Every single container must usually conform to some DOT 2Q container in accordance with § 178.33a. The subsequent circumstances also apply beneath Variation two—