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The attachment to the tops and bottoms only of cylinders by welding of neckrings, footrings, handles, bosses, pads and valve protection rings is approved offered that this kind of attachments as well as part of the container to which They may be attached are made of weldable metal, the carbon content material of which can not exceed 0.25 per cent.

(iii) For the purpose of pressure measurement, the First pressure should be established even though the specimen is beneath a stress of twelve,000 psi plus the strain indicator looking at remaining set within the calculated corresponding pressure.

(1) Every single tension specimen must have a gauge length of two inches using a width not exceeding one particular and one-50 percent inches. Except for the grip ends, the specimen may not be flattened. The grip ends could be flattened to within just just one inch of every conclude from the lowered portion.

One particular cylinder taken at random out of each and every great deal of 200 or a lot less, has to be subjected to some flattening examination as follows:

(2) Once the cylinders are heat treated in a steady furnace, two tension specimens and three Charpy impression specimens have to be analyzed from among the list of cylinders or even a check ring from Every four hours or considerably less of output. However, in no case may a take a look at lot based on this production time period exceed two hundred cylinders.

(ii) Obtaining a Accredited chemical Evaluation from the material or cylinder manufacturer for every soften, or Solid of fabric; or

(1) The attachment towards the tops or bottoms of cylinders of neckrings, footrings, handlers, bosses, pads, and valve guarding rings is approved supplied that this sort of attachments plus the part of the container to which These are attached are created of weldable metal, the carbon information of which may not exceed 0.twenty five p.c.

Reheat treatment of rejected cylinders is licensed. Subsequent thereto, cylinders have to move all prescribed exams to generally be appropriate. Fix by welding is approved.

(iii) For the goal of pressure measurement, the initial strain reference needs to be set when the specimen is below a strain of twelve,000 psi and the strain indicator reading through remaining set within the calculated corresponding strain.

(a) Just about every packaging represented as manufactured to the DOT specification or simply a UN conventional have to be marked on the non-detachable element from the packaging with specification markings conforming to the relevant specification, and with the following:

(iv) Long term volumetric enlargement may not exceed 10 % of the overall volumetric enlargement at exam stress.

(three) The floor of your cylinder should be insulated. The insulating material should be fireplace resistant. The insulation on non-evacuated jackets needs to be protected which has a steel jacket not under 0.060-inch thick or an aluminum jacket not under 0.070 inch thick, so built that dampness can not are available contact with the insulating product. If a vacuum is taken care of within the insulation House, the evacuated jacket have to be suitable for a bare minimum collapsing pressure of 30 psig differential no matter if made from steel or aluminum.

(ii) Taper threads must be of the duration not less than as more info specified for American Normal taper pipe threads.

(iii) When dimension of cylinder would not permit securing straight specimens, the specimens can be taken in almost any spot or direction and will be straightened or flattened cold, by strain only, not by blows.

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