Detailed Notes on bar 178
Detailed Notes on bar 178
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Just one cylinder taken at random out of every number of cylinders must be hydrostatically examined to destruction.
The material needs to be identified by any appropriate method except that plates and billets For warm-drawn cylinders needs to be marked with the heat selection.
Pressure-retaining products should be identified by any appropriate technique that doesn't compromise the integrity of your cylinder. Plates and billets for hotdrawn cylinders have to be marked with the warmth quantity.
This take a look at may be employed and should be as demanded by CGA C-3. The specimen needs to be bent until the elongation in the outer floor, adjacent to the foundation of the weld, concerning the lightly scribed gauge strains a to b, has to be at the least twenty per cent, besides that this share may be decreased for steels using a tensile toughness in surplus of fifty,000 psig, as supplied in paragraph (k) of the section.
The minimum amount wall thickness needs to be these types of the wall stress within the minimum specified exam strain might not exceed 67 p.c from the minimum amount tensile toughness of your metal as identified through the Bodily and burst tests demanded and may not be more than 70,000 p.
(iv) Long term volumetric growth may well not exceed 10 percent of the whole volumetric enlargement at test force.
(iii) The least take a look at strain needs to be preserved at the very least thirty seconds and sufficiently lengthier to guarantee total expansion. Any inner stress used following heat-treatment method and previous to the Formal examination may well not exceed ninety percent of the take a look at force.
Reheat cure of rejected cylinders is authorized. Subsequent thereto, cylinders must go all prescribed assessments to generally be appropriate. Repair by welding is licensed.
Each cylinder has to be uniformly and adequately warmth treated, prior to tests, by any ideal technique in surplus of 1100 °F. Heat therapy have to be achieved In the end forming and welding functions, except that when brazed joints are made use of, heat therapy must observe any forming and welding functions but could possibly be carried out before, throughout, or once the brazing operations. Liquid quenching isn't authorized.
A specimen needs to be Minimize from a person cylinder of each large amount of 200 or much less, or simply a welded test plate. The welded exam plate have to be of among the list of heats within the great deal of two hundred or much less which it represents, in the same situation and approximately exactly the same thickness as the cylinder wall apart from that it will not be of the lesser thickness than that needed for 1 / 4 dimensions Charpy impression specimen. The weld have to be produced by the exact same techniques and subjected to the same warmth cure as the most important weld within the cylinder.
(vii) The effects Qualities of every set of impression specimens may not be below the values in the subsequent desk:
There have to read more be no evidence of cracking of your sample when it can be flattened among flat plates to not more than six (six) instances the wall thickness. If this check fails, 1 supplemental sample within the very same great deal may very well be taken. If this second sample fails, your complete good deal needs to be turned down.
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(ii) 1 cylinder needs to be picked from Every whole lot and be hydrostatically pressure analyzed to destruction. If this cylinder bursts underneath 5 (5) occasions the services pressure, then two more cylinders through the very same great deal given that the Formerly analyzed cylinder has to be picked and subjected to this check.