Not known Facts About bar 178
Not known Facts About bar 178
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(iv) Lasting volumetric expansion might not exceed 10 % of the whole volumetric expansion at test stress.
(iii) Just about every ligament which separates two openings need to be a minimum of thrice the average of the diameters of the two openings.
Cylinders have to be manufactured making use of tools and procedures suitable to ensure that Each individual cylinder made conforms to the necessities of this subpart and also to the next specifications:
(ii) In utilizing the “extension under load” process, the whole pressure (or “extension underneath load”) similar to the tension at which the 0.two p.c permanent strain takes place may very well be decided with adequate precision by calculating the elastic extension on the gauge duration less than ideal load and adding thereto 0.
(i) If the chosen cylinder passes the water-jacket or immediate growth check, the remaining cylinders in Just about every lot has to be pressure tested by the proof tension h2o-jacket or immediate enlargement take a look at technique as prescribed in CGA C-one.
(five) All cylinders, if water quenched or quenched using a liquid generating a cooling rate in surplus of eighty p.c with the cooling fee of water, have to be inspected through the magnetic particle or dye penetrant method to detect the presence of quenching cracks. Any cylinder observed to possess a quench crack have to be turned down and is probably not requalified.
(iii) The minimum check force needs to be maintained no less than 30 seconds and adequately longer to make sure full enlargement. Any inner stress used right after heat-therapy and previous to the Formal exam may well not exceed 90 percent of the take a look at pressure.
Radiographic inspection is needed on all welded joints that happen to be subjected to inside tension, apart from that with the discretion from the disinterested inspector, openings fewer than twenty five % of the click here container diameter need not be subjected to radiographic inspection.
(ii) In using the “extension less than load” method, the full strain (or “extension under load”) comparable to the anxiety at which the 0.2-p.c lasting pressure takes place could possibly be decided with sufficient precision by calculating the elastic extension of the gauge length below proper load and adding thereto 0.
(one) Each individual cylinder need to be heated and held at the right temperature for a minimum of one hour for each inch of thickness according to the utmost thickness with the cylinder and afterwards quenched in an acceptable liquid medium having a cooling level not in extra of 80 % of drinking water.
(one) Openings are permitted in heads only. They need to be circular and could not exceed three inches in diameter or one particular third from the cylinder diameter, whichever is much less. Each opening in the cylinder has to be supplied that has a fitting, boss or pad, both integral with, or securely hooked up to, the cylinder human body by fusion welding.
Reheat procedure of turned down cylinders is approved. Subsequent thereto, cylinders will have to move all prescribed checks to be suitable. Repair service by welding or spinning is not really approved.
(ii) Taper threads have to be of a length not less than as specified for American Normal taper pipe threads.
Inspection has to be performed on the inside of every container just before closing and externally on Every completed container after heat treatment method.