Reheat remedy is approved for rejected cylinders. Subsequent thereto, cylinders should pass all prescribed exams to be satisfactory. Restore by welding is not approved.
(two) Warmth treatment method just isn't required right after welding of weldable low-carbon pieces to attachments of comparable content which have been previously welded to the highest or base of cylinders and adequately heat addressed, furnished these kinds of subsequent welding doesn't produce a temperature in surplus of 400 °F in almost any Element of the highest or bottom substance.
(ii) Taper threads to become of duration not lower than as specified for American Standard taper pipe threads.
Reheat remedy of rejected cylinders is licensed. Subsequent thereto, cylinders have to move all prescribed tests to become satisfactory. Fix of welded seams by welding is authorized.
The cylinder need to be made of both metal or aluminum conforming to the following demands:
(b) Each this kind of 25,000 containers or significantly less, successively made a day, shall constitute a good deal and If your examination container shall fail, the large amount shall be turned down or ten additional containers may be picked at random and subjected for the exam beneath which failure transpired.
Testing is necessary on two (2) specimens faraway from the sphere or flat agent sample plates of the identical warmth of material taken at random from the metal utilised to supply the spheres.
(two) Each individual opening during the cylinder, more info other than These for protection gadgets, needs to be presented using a fitting manager, or pad, securely attached to the cylinder by welding or by threads. If threads are utilized they have to comply with the following:
(one) Strain, around similar to although not below provider stress, should be placed on 1 facet with the finished bottom above a location of not less than one⁄16 of the overall spot of the bottom although not under three⁄4 inch in diameter, such as the closure, for at least one particular moment, in the course of which era one other facet of The underside exposed to stress need to be included with water and closely examined for indications of leakage.
(seven) Apart from as in any other case furnished in paragraph (g)(six) of this section, all cylinders, if drinking water quenched or quenched by using a liquid developing a cooling price in excess of 80 % with the cooling charge of drinking water, has to be inspected with the magnetic particle, dye penetrant or ultrasonic system to detect the presence of quenching cracks. Any cylinder made to the necessities for specification 3AA and located to have a quenching crack should be turned down and might not be requalified.
(b) A UN typical packaging for which the UN standard is ready forth With this aspect could possibly be marked with the United Nations image along with other specification markings provided that it completely conforms to the necessities of this aspect.
(iv) Long-lasting volumetric growth may not exceed 10 percent of the overall volumetric growth at exam force.
(iii) When size of cylinder does not allow securing straight specimens, the specimens could be taken in almost any spot or route and should be straightened or flattened chilly, by tension only, not by blows.
(iii) Once the dimension of the cylinder does not allow securing straight specimens, the specimens may be taken in any area or path and may be straightened or flattened cold, by strain only, not by blows.