bar 178 No Further a Mystery
bar 178 No Further a Mystery
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(one) No defect is permitted that is likely to weaken the completed cylinder appreciably. A reasonably sleek and uniform surface complete is needed. The shell portion need to be a fairly true cylinder.
Materials has to be discovered by any acceptable method, except that plates and billets For decent-drawn cylinders need to be marked with the warmth number.
A DOT 39 cylinder can be a seamless, welded, or brazed cylinder having a assistance pressure to not exceed 80 percent of your check pressure. Spherical force vessels are authorized and lined by references to cylinders In this particular specification.
When this component calls for that a packaging be marked with a DOT specification or UN standard marking, marking from the packaging with the suitable DOT or UN markings is the certification that—
(i) If the chosen cylinder passes the drinking water-jacket or direct expansion examination, the remaining cylinders in Just about every great deal must be pressure tested by the evidence pressure water-jacket or direct expansion test technique as prescribed in CGA C-one.
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(i) Nonflammable cryogenic liquids. Cylinders intended for use from the transportation website of nonflammable cryogenic liquid need to have an outer jacket made from steel or aluminum.
(1) For spheres the check have to be with the weld between parallel steel plates over a press with welded seam at right angles on the plates.
Specimens taken throughout the circumferentially welded seam must be Reduce from one cylinder taken at random from Every single lots of 200 or considerably less cylinders right after heat procedure and should move satisfactorily the following checks:
(one) Just about every cylinder needs to be heated and held at the right temperature for at least 1 hour for each inch of thickness determined by the maximum thickness of your cylinder then quenched in an acceptable liquid medium using a cooling rate not in extra of eighty % of h2o.
Designations and restricting chemical compositions of metal authorized by this specification need to be as revealed in desk one in paragraph (o) of the area.
(two) A spun cylinder is a person in which an conclude closure from the completed cylinder is welded because of the spinning process.
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(one) When the cylinders are warmth treated inside of a batch furnace, two pressure specimens and a few Charpy affect specimens have to be analyzed from one of several cylinders or perhaps a exam ring from Each individual batch. The good deal measurement represented by these checks may well not exceed two hundred cylinders.