Open hearth or electric furnace metal of uniform quality must be utilised. A heat of metal created beneath the technical specs shown in Desk 1 Within this paragraph (b), a Look at chemical analysis that is marginally outside of the required range is acceptable, if satisfactory in all other respects, presented the tolerances shown in Desk two Within this paragraph (b) are usually not exceeded.
(iii) If because of welded attachments on the very best head There exists insufficient floor from which to take a specimen, it could be taken from a consultant head of the same heat treatment as the test cylinder.
A DOT 39 cylinder is often a seamless, welded, or brazed cylinder with a services strain not to exceed 80 p.c with the check tension. Spherical force vessels are licensed and lined by references to cylinders in this specification.
1 cylinder taken at random out of each and every large amount of 200 or much less, should be subjected to some flattening check as follows:
(ii) To determine the utmost longitudinal tensile strain because of bending, the next formula need to be applied:
(5) All cylinders, if water quenched or quenched using a liquid creating a cooling fee in surplus of 80 percent of the cooling price of drinking water, needs to be inspected through the magnetic particle or dye penetrant process to detect the presence of quenching cracks. Any cylinder discovered to possess a quench crack must be rejected and is probably not requalified.
(b) A UN standard packaging for which the UN typical is ready forth click here In this particular element may very well be marked With all the United Nations symbol and various specification markings only if it entirely conforms to the necessities of the part.
(i) The remaining cylinders from the ton must be examined from the proof stress, drinking water-jacket, or immediate enlargement test system as prescribed in CGA C-one. The minimum take a look at strain must be taken care of for the specific timeframe and the testing tools needs to be calibrated as prescribed in CGA C-1.
(two) Warmth cure is not really expected just after welding or brazing weldable very low carbon parts to attachments, laid out in paragraph (file)(one) of this section, of similar material that have been Earlier welded or brazed to the best or bottom of cylinders and properly heat handled, supplied this kind of subsequent welding or brazing won't create a temperature in surplus of four hundred °F in almost any Section of the highest or bottom material.
(2) All capabilities performed by, or on behalf of, the individual whose name or symbol appears as Section of the marking conform to requirements laid out in this aspect.
(ii) Taper threads have to be of a size not fewer than that specified for American Typical taper pipe threads.
One container taken at random from two hundred or a lot less needs to be hydrostatically examined to destruction. The rupture pressure has to be integrated as Element of the inspector's report.
(iii) On the cylindrical part of the shell that extends further than the recessed base in the cylinder, constituting an integral and non-pressure Element of the cylinder;
(2) If a sign of your title from the maker or other identification from the packaging as specified via the capable authority is necessary, the name and tackle or image from the maker or maybe the approval agency certifying compliance with the UN normal need to be entered. Symbols, if utilized, have to be registered While using the Affiliate Administrator.