(one) Force, about the same as but no under services stress, must be placed on just one aspect in the finished base around a location of at the least 1⁄16 of the full place of The underside but not fewer than 3⁄4 inch in diameter, such as the closure, for a minimum of one particular minute, for the duration of which era another side of The underside exposed to force have to be coated with water and closely examined for indications of leakage.
(iii) For the purpose of strain measurement, the Preliminary strain need to be established though the specimen is under a strain of twelve,000 psi plus the pressure indicator looking through remaining set at the calculated corresponding pressure.
(3) A plugged cylinder is a single where a permanent closure in the bottom of a finished cylinder continues to be effected by a plug.
Marking must be accomplished by stamping into the metallic with the cylinder. All markings must be legible and Situated on a shoulder.
(iii) For the objective of pressure measurement, the Preliminary strain should be set although the specimen is beneath a worry of twelve,000 psi and the pressure indicator examining remaining set on the calculated corresponding strain.
(three) Each and every exam cylinder have to stand up to flattening to nine situations the wall thickness with out cracking. When the alternate bend check is applied, the examination specimens should continue being uncracked when bent inward all-around a mandrel while in the direction of curvature of your cylinder wall right until the interior edges are at a length apart not bigger when compared to the diameter of the mandrel.
(iii) The minimum amount check stress have to be managed at least 30 seconds and sufficiently extended to ensure total expansion. Any inner strain used just after heat-therapy and before the Formal take a look at may well not exceed ninety p.c of the test pressure.
(iv) All straight threads should have not less than 6 engaged threads, a decent in shape, and a factor of security in shear of at least ten in the take a look at stress on the cylinder. Shear anxiety must be calculated through the use of the right thread shear region in accordance with NBS Handbook H-28.
(iii) For the goal of strain measurement, the initial pressure reference needs to be established even though the specimen is below a tension of 12,000 psi as well as pressure indicator reading remaining established with the calculated corresponding strain.
(iii) When dimension of cylinder would not permit securing straight specimens, the specimens may very well be taken in any site or path and should be straightened or flattened cold, by strain only, not by blows.
(a) By appliances and approaches that should assure uniformity of finished containers; Grime and scale to get eradicated as necessary; no defect acceptable that is likely to weaken the concluded container appreciably; fairly easy and uniform surface complete expected.
Each cylinder, in advance of insulating and jacketing, need to effectively withstand a tension take a look at as follows:
(seven) Other than as if not supplied in paragraph (g)(six) of the portion, all cylinders, if water quenched or quenched that has a liquid developing a cooling amount in excessive of website eighty percent from the cooling price of h2o, has to be inspected because of the magnetic particle, dye penetrant or ultrasonic system to detect the presence of quenching cracks. Any cylinder created to the necessities for specification 3AA and located to possess a quenching crack should be turned down and may not be requalified.
(iii) The bare minimum examination force needs to be maintained at the least thirty seconds and adequately for a longer period to ensure total growth. Any inner strain utilized immediately after warmth-procedure and ahead of the Formal test may not exceed 90 percent of the test pressure.
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