(iii) When size of cylinder does not permit securing straight specimens, the specimens may be taken in any spot or direction and could be straightened or flattened chilly, by tension only, not by blows.
(two) Warmth cure is not needed after the welding or brazing of weldable lower carbon pieces to attachments of similar content that have been Beforehand welded or brazed to the top or bottom of cylinders and correctly warmth addressed, presented this kind of subsequent welding or brazing isn't going to produce a temperature in excess of 400 °F in almost any part of the very best or base content.
Reheat therapy is licensed for turned down cylinders. Subsequent thereto, cylinders must go all prescribed checks for being appropriate. Repair by welding or spinning is just not licensed.
(4) All cylinders needs to be inspected with the magnetic particle or dye penetrant method to detect the presence of quenching cracks. Any cylinder uncovered to possess a quenching crack should be turned down and is probably not requalified.
(i) The word “spun” or “plug” needs to be positioned near the DOT specification marking when an close closure within the concluded cylinder continues to be welded via the spinning procedure, or effected by plugging.
(i) The remaining cylinders in Every large amount have to be analyzed because of the evidence tension drinking water-jacket or direct growth examination approach as prescribed in CGA C-one. The bare minimum examination strain must be managed for the particular timeframe and also the screening products has to be calibrated as prescribed in CGA C-one.
(four) Determine porosity of filling and tare weights; confirm compliance of marking with prescribed specifications; attain vital copies of steel shell studies; and furnish full stories essential by this specification to the person who has concluded the manufacture with the cylinders and, on ask for, towards the purchaser.
(two) A spun cylinder is a person by which an stop closure from the completed cylinder has become welded with the spinning method.
(iii) Straight threads having no less than four engaged threads, to obtain limited in good shape and calculated shear energy a minimum of 10 occasions the examination strain with the container; gaskets expected, suitable to circumvent leakage.
Reheat treatment is approved for turned down cylinders. Subsequent thereto, cylinders ought to pass all prescribed exams to be suitable. Restore by welding or spinning is not really approved.
Cylinders needs to be produced using machines and processes enough in order that Each and every cylinder produced conforms to the requirements of the subpart. No defect is acceptable that is likely to weaken the concluded cylinder appreciably.
(three) The area in the cylinder have to be insulated. The insulating materials must be hearth resistant. The insulation on non-evacuated jackets need to be covered having a metal jacket not lower than 0.060-inch thick or an aluminum jacket not a lot less than 0.070 inch thick, so produced that moisture cannot are available contact with the insulating substance. If a vacuum is maintained during the insulation Area, the evacuated jacket needs to be made for a least collapsing strain of thirty psig differential whether crafted from steel or aluminum.
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(iii) When dimensions of cylinder does not permit securing straight specimens, the specimens may very well be more info taken in any spot or direction and will be straightened or flattened cold, by strain only, not by blows.
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