There need to be no proof of cracking with the sample when it's flattened in between flat plates to no more than six (6) times the wall thickness. If this exam fails, a single additional sample through the exact whole lot can be taken. If this next sample fails, the whole large amount has to be rejected.
Reheat cure of rejected cylinders is approved. Subsequent thereto, cylinders ought to pass all prescribed exams to get appropriate. Welds might be fixed by appropriate ways of fusion welding.
Content has to be determined by any suitable approach other than that plates and billets for hotdrawn cylinders need to be marked with the heat range.
(iv) Further more presented that wall stress for cylinders having copper brazed longitudinal seams might not exceed 95 per cent of any of the above values. Measured wall thickness may not include things like galvanizing or other protective coating.
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(two) A plugged cylinder is just one wherein a permanent closure in The underside of a finished cylinder has become effected by a plug.
(iii) The least exam pressure has to be taken care of not less than 30 seconds and adequately extended to be sure comprehensive expansion. Any inner tension used following heat-treatment method and prior to the Formal examination might not exceed 90 p.c of the take a look at force.
(five) All cylinders, if water quenched or quenched by using a liquid creating a cooling rate in excessive of eighty p.c with the cooling fee of h2o, have to be inspected through the magnetic particle or dye penetrant technique to detect the existence of quenching cracks. Any cylinder identified to possess a quench crack must be turned down and is probably not requalified.
A physical test have to be done to determine generate strength, tensile energy, elongation, and reduction of region of fabric as follows:
(ii) The minimum check pressure needs check here to be taken care of at least thirty seconds and adequately more time to make sure finish growth. Any inside strain utilized just after warmth-treatment and former to the Formal examination may well not exceed ninety % with the exam strain.
(vii) The affect Homes of each list of effects specimens might not be under the values in the following desk:
(3) As a security precaution, Should the producer elects to produce this examination ahead of the hydrostatic examination, the company really should layout the examination equipment so the stress is applied to the smallest area practicable, within the level of closure, and to be able to use the smallest possible quantity of air or fuel.
(1) If the cylinders are warmth addressed inside a batch furnace, two rigidity specimens and three Charpy affect specimens needs to be examined from one of several cylinders or a exam ring from Every batch. The whole lot dimensions represented by these assessments might not exceed 200 cylinders.
(iv) A brass fitting may very well be brazed to the metal boss or flange on cylinders utilised as part areas of handheld fire extinguishers.