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(ii) In using the “extension under load” process, the overall strain (or “extension under load”) equivalent to the stress at which the 0.2 p.c long lasting pressure occurs can be established with adequate accuracy by calculating the elastic extension of your gauge length underneath ideal load and including thereto 0.
Radiographic inspection is needed on all welded joints which might be subjected to internal force, except that on the discretion of your disinterested inspector, openings less than 25 p.c with the container diameter needn't be subjected to radiographic inspection.
Just about every container needs to be hydraulically pressurized in a drinking water jacket to at the very least one hundred pc, although not in excess of one hundred ten percent, on the exam stress and maintained at this tension for no less than three minutes. Complete and permanent expansion need to be recorded and A part of the inspector's report.
(iii) Straight threads have to have at the very least 4 engaged threads, restricted healthy and calculated shear energy at the very least 10 periods the test force from the cylinder. Gaskets, which stop leakage and therefore are inert into the harmful materials, are necessary.
(i) The remaining cylinders in Each individual great deal needs to be examined because of the proof strain drinking water-jacket or direct enlargement take a look at approach as prescribed in CGA C-1. The least take a look at force must be managed for the particular timeframe and also the testing devices need to be calibrated as prescribed in CGA C-1.
Just after force tests, a flattening examination needs to be performed on a single cylinder taken at random out of every large amount of 200 or fewer by inserting the cylinder amongst wedge-formed knife edges getting a sixty degree provided angle, rounded to your 50 percent-inch radius.
(ii) Verifying which the prescribed least thickness was fulfilled by measuring or witnessing here the measurement with the wall thickness; and
(one) Every single tension specimen will need to have a gauge size of two inches that has a width not exceeding one particular and just one-half inches. Apart from the grip finishes, the specimen may not be flattened. The grip ends might be flattened to in just 1 inch of every stop of your lowered portion.
(ii) The minimum exam strain should be maintained at least thirty seconds and adequately for a longer period to guarantee full enlargement. Any internal strain used following heat-cure and previous on the Formal take a look at may not exceed 90 p.c of your test stress.
Reheat procedure is authorized for turned down cylinders. Subsequent thereto, cylinders ought to pass all prescribed exams to get satisfactory. Repair by welding or spinning is not approved.
Reheat remedy is authorized for turned down cylinders. Subsequent thereto, cylinders need to pass all prescribed tests for being suitable. Fix by welding or spinning is not really approved.
(four) As a security precaution, if the producer elects for making this exam ahead of the hydrostatic test, he must style and design his equipment so which the tension is placed on the smallest place practicable, within the point of closure, and to be able to make use of the smallest attainable volume of air or fuel.
(iii) Acquiring a Accredited Verify Examination on one cylinder out of each and every number of 200 cylinders or considerably less, if a certificate containing information to point compliance with the fabric specification is acquired.