(one) A spun cylinder is one particular in which an stop closure while in the finished cylinder has been welded via the spinning procedure.
Reheat therapy of turned down cylinders is authorized. Subsequent thereto, cylinders should move all prescribed tests to become appropriate. Welds may very well be fixed by ideal methods of fusion welding.
Content need to be identified by any suited system apart from that plates and billets for hotdrawn cylinders need to be marked with the warmth amount.
A DOT 4D cylinder is often a welded metal sphere (two seamless hemispheres) or circumferentially welded cylinder (two seamless drawn shells) using a water potential not about a hundred lbs in addition to a company tension of no less than three hundred although not in excess of five hundred psig. Cylinders shut in by spinning process will not be authorized.
(1) The attachment into the tops or bottoms of cylinders of neckrings, footrings, handlers, bosses, pads, and valve shielding rings is licensed delivered that this kind of attachments along with the part of the container to which They may be hooked up are made of weldable metal, the carbon material of which can not exceed 0.twenty five %.
(iv) Long-lasting volumetric enlargement might not exceed 10 % of the whole volumetric growth at check tension.
(iii) The minimum amount exam pressure have to be taken care of not less than 30 seconds and adequately lengthier to ensure full enlargement. Any internal stress used soon after warmth-remedy and prior to the official check may well not exceed 90 p.c of the check force.
S = PD / 4tE The place: S = wall anxiety in lbs psi; P = take a look at strain prescribed for drinking water jacket examination, i.e., at the very least 2 situations company pressure, in psig; D = outside the house diameter in inches; t = minimum amount wall thickness in inches; E = 0.
(1) Each cylinder has to be uniformly and effectively heat dealt with prior to take a look at through the relevant process referenced in table 1 of appendix A to this aspect. Warmth treatment must be attained All things considered forming and welding operations, apart from that when brazed joints are applied, heat remedy have to stick to any forming and welding operations, but may very well be performed ahead of, during or once the brazing operations (see paragraph (n) of this part for weld repairs).
A “root” bend test specimen need to be Reduce from the cylinder or welded check plate, used for the tensile examination specified in paragraph (l)(1) of the section and from any other seam or equal welded test plate In case the seam is welded by a course of action distinct from that utilized for the foremost seam.
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(1) Stress, close to the same as but no fewer than assistance stress, need to be applied to a person facet of your concluded bottom in excess of a region of not less than 1⁄sixteen of the overall area of the bottom although not a lot less than 3⁄four inch in diameter, such as the closure, for a minimum of 1 moment, all through which period the opposite aspect of The underside exposed to pressure needs to be coated with drinking water and intently examined for indications of leakage. Besides as provided in paragraph (n) of the section, a cylinder that's leaking need to be rejected.
(1) If the cylinders are heat handled inside a batch furnace, two pressure specimens and a few Charpy effects specimens have to be analyzed from among the cylinders or perhaps a check ring from Every single batch. The lot measurement represented by these assessments may not exceed 200 cylinders.
A person cylinder taken at random out of every lots of cylinders must check here be hydrostatically examined to destruction.