Cylinders have to be created using gear and procedures adequate to ensure that Each and every cylinder developed conforms to the necessities of this subpart. No defect is permitted that is probably going to weaken the finished container appreciably.
Reheat therapy is approved for turned down cylinders. Subsequent thereto, cylinders should move all prescribed tests for being satisfactory. Restore by welding or spinning just isn't approved.
(i) Assuming the cylinder should be to be supported horizontally at its two ends only and also to be uniformly loaded over its complete length consisting of the load for every unit of size of the straight cylindrical portion crammed with drinking water and compressed to the required test stress; the sum of two occasions the most tensile tension in The underside fibers due to bending, in addition that in exactly the same fibers (longitudinal pressure), on account of hydrostatic check strain may well not exceed eighty % of the minimal generate energy of your metal at these kinds of utmost pressure. Wall thickness have to be improved when essential to meet the prerequisite.
When this part calls for that a packaging be marked having a DOT specification or UN common marking, marking on the packaging with the appropriate DOT or UN markings would be the certification that—
(i) The phrase “spun” or “plug” should be positioned near the DOT specification marking when an conclude closure during the finished cylinder has been welded with the spinning process, or effected by plugging.
(1) Each individual cylinder need to be uniformly and adequately heat addressed just before check because of the relevant here process proven in desk one of appendix A to this part. Heat procedure have to be completed after all forming and welding functions, except that when brazed joints are utilised, warmth therapy need to stick to any forming and welding operations, but can be completed before, through or following the brazing operations (see paragraph (m) of this area for weld repairs).
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(two) A spun cylinder is one particular where an close closure inside the completed cylinder continues to be welded through the spinning approach.
(3) A plugged cylinder is one wherein a everlasting closure in The underside of the concluded cylinder has long been effected by a plug.
(1) By best appliances and methods. No defect is suitable that is probably going to weaken the finished container appreciably. A reasonably clean and uniform area finish is needed.
Designations and restricting chemical compositions of metal approved by this specification should be as demonstrated in table one in paragraph (o) of the section.
Materials should be discovered by any appropriate process besides that plates and billets For decent-drawn cylinders has to be marked with warmth selection.
Cylinders must be created working with products and procedures satisfactory to make certain Each and every cylinder developed conforms to the requirements of the subpart. No fissure or other defect is permitted that is probably going to weaken the finished cylinder appreciably. A fairly easy and uniform surface end is necessary. Otherwise originally free from these types of defects, the floor could possibly be machined or if not taken care of to eliminate these defects.
One completed cylinder picked at random out of every lot of five hundred or a lot less successively created have to be hydrostatically tested to four