(a) Just about every packaging represented as produced to your DOT specification or perhaps a UN conventional has to be marked with a non-removable component in the packaging with specification markings conforming for the applicable specification, and with the subsequent:
(two) When the porosity of each cylinder just isn't recognized, a cylinder taken at random from many two hundred or significantly less has to be examined for porosity. When the test cylinder fails, Each and every cylinder during the ton might be examined independently and people cylinders that move the examination are satisfactory.
Stress-retaining materials needs to be recognized by any suitable technique that does not compromise the integrity of your cylinder. Plates and billets for hotdrawn cylinders needs to be marked with the heat quantity.
(iv) Further offered that wall stress for cylinders possessing copper brazed longitudinal seams might not exceed 95 per cent of any of the above mentioned values. Calculated wall thickness may well not consist of galvanizing or other protective coating.
(one) Physical examination for spheres are required on two specimens Lower from the flat representative sample plate of exactly the same warmth taken at random from the steel utilized to generate the sphere.
This test could possibly be employed and must be as essential by CGA C-3. The specimen needs to be bent until the elongation at the outer floor, adjacent to the basis of your weld, concerning the evenly scribed gage traces a to b, have to be not less than twenty p.c, except that this percentage could be minimized for steels having a tensile energy in extra of 50,000 psig, as furnished in paragraph (k) of this here portion.
(1) Markings needs to be stamped plainly and permanently on shoulder or top rated head of jacket or on a permanently hooked up plate or head protecting ring.
(two) All functions performed by, or on behalf of, the individual whose identify or image seems as part of the marking conform to necessities laid out in this part.
A Actual physical test must be carried out to find out produce toughness, tensile toughness, elongation, and reduction of space of fabric as follows:
(ii) In using the “extension underneath load” approach, the entire pressure (or “extension beneath load”) equivalent to the strain at which the 0.two % long term pressure occurs can be established with sufficient precision by calculating the elastic extension of the gauge size under ideal load and including thereto 0.
(one) Stress, somewhere around the same as but no below company strain, needs to be applied to one particular facet from the completed base around a place of at least 1⁄sixteen of the total place of the bottom but not a lot less than 3⁄4 inch in diameter, such as the closure, for a minimum of 1 moment, during which time the opposite side of the bottom exposed to strain needs to be covered with water and carefully examined for indications of leakage.
A DOT 39 cylinder is really a seamless, welded, or brazed cylinder that has a services stress never to exceed 80 per cent of your examination tension. Spherical strain vessels are licensed and included by references to cylinders In this particular specification.
Product should be recognized by any ideal strategy except that plates and billets For warm-drawn cylinders must be marked with warmth variety.
(ii) The porous filling product have to be uniform in quality and freed from voids, besides that a well drilled to the filling product beneath the valve is authorized When the very well is full of a cloth of such variety which the features from the filling product are usually not impaired;