Specimens taken throughout the circumferentially welded seam must be Lower from 1 cylinder taken at random from Every single great deal of 200 or less cylinders right after heat treatment and have to move satisfactorily the next checks:
(iv) Everlasting volumetric growth might not exceed ten p.c of the whole volumetric expansion at take a look at tension.
indicate the packaging identification markings demanded by this part including, in which relevant, the name and handle or symbol with the packaging manufacturer or acceptance agency.
A root bend exam specimen should be removed from the cylinder or welded check plate which was used for the tensile test laid out in paragraph (l)(one) of the segment. The specimen should be taken from across the circumferential seam and has to be organized and analyzed in conformance with and need to satisfy the necessities of CGA C-3.
(1) Actual physical examination for spheres are expected on two specimens Lower from the flat representative sample plate of the same heat taken at random from the metal utilised to provide the sphere.
(i) Assuming the cylinder is usually to be supported horizontally at its two ends only also to be uniformly loaded about its full size consisting of the weight per unit of length from the straight cylindrical portion full of h2o and compressed to the required check strain; the sum of two occasions the utmost tensile anxiety in The underside fibers because of bending, furthermore that in exactly the same fibers (longitudinal stress), as a result of hydrostatic exam tension might not exceed eighty per cent of the bare minimum yield toughness of the metal at this sort of maximum stress. Wall thickness need to be enhanced when important to satisfy the necessity.
(four) A examination cylinder or test ring want represent only one of many heats inside of a furnace batch delivered one other heats during the batch have previously been examined and have handed the tests and that these exams usually do not characterize much more than 200 cylinders from Anyone heat.
All spun cylinders and plugged cylinders need to be examined for leakage by fuel or air stress just after website the bottom has become cleaned and is particularly absolutely free from all humidity. Tension, approximately similar to but no under the provider force, need to be applied to a single aspect on the concluded base about an area of no less than 1⁄sixteen of the overall region of The underside although not lower than 3⁄four inch in diameter, including the closure, for a minimum of just one moment, throughout which era one other side of The underside exposed to pressure should be included with water and closely examined for indications of leakage.
(iii) For the purpose of pressure measurement, the Original strain have to be established even though the specimen is beneath a pressure of 12,000 psi, plus the strain indicator looking through need to be set with the calculated corresponding strain.
Besides the knowledge demanded by § 178.35, the history of chemical analyses ought to also include the alloy designation, and relevant info on iron, titanium, zinc, magnesium and another relevant element used in the construction from the cylinder.
(vii) The impact Attributes of each and every set of effects specimens will not be a lot less than the values in the subsequent table:
A DOT 39 cylinder is really a seamless, welded, or brazed cylinder with a provider pressure to not exceed eighty p.c on the exam stress. Spherical stress vessels are approved and protected by references to cylinders With this specification.
Results with the flattening exam, Actual physical tests, burst examination, and biking check have to conform to the next:
Product should be determined by any suitable method except that plates and billets for hotdrawn cylinders must be marked with the warmth range.