5 Simple Techniques For bar 178
5 Simple Techniques For bar 178
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(two) Each this kind of 5,000 containers or considerably less, successively generated on a daily basis, shall represent lots and if the exam container shall are unsuccessful, the ton shall be turned down or 10 added containers can be chosen at random and subjected for the examination beneath which failure transpired.
(6) Intermediate manganese steels may be tempered at temperatures not a lot less than 1150 °F., and just after heat treating Each individual cylinder have to be submitted to some magnetic exam to detect the presence of quenching cracks. Cracked cylinders must be turned down and destroyed.
Force-retaining components needs to be recognized by any appropriate strategy that does not compromise the integrity of the cylinder. Plates and billets for hotdrawn cylinders has to be marked with the heat number.
(ii) In using the “extension under load” process, the full strain (or “extension below load”) akin to the anxiety at which the 0.two per cent long lasting pressure happens may be identified with sufficient precision by calculating the elastic extension on the gauge duration beneath proper load and introducing thereto 0.
Resources needs to be recognized by any appropriate process apart from that plates and billets for hot-drawn cylinders have to be marked with the warmth quantity.
One particular completed cylinder chosen at random out of each and every lots of 500 or significantly less successively made have to be hydrostatically examined to four
(2) If the cylinders are warmth handled in a very continuous furnace, two tension specimens and three Charpy affect specimens needs to be tested from one of many cylinders or maybe a exam ring from Every four hrs or a lot less of output. Nevertheless, in no situation get more info may possibly a take a look at ton dependant on this production period exceed 200 cylinders.
(i) Nonflammable cryogenic liquids. Cylinders meant to be used during the transportation of nonflammable cryogenic liquid should have an outer jacket fabricated from metal or aluminum.
(ii) In utilizing the “extension below load” strategy, the entire pressure (or “extension beneath load”) similar to the stress at which the 0.2 % permanent pressure takes place can be identified with sufficient accuracy by calculating the elastic extension on the gauge length beneath ideal load and including thereto 0.
(three) Each individual specimen for the tension and Charpy affect checks should be taken with the side wall of a cylinder or from a ring that has been warmth treated With all the concluded cylinders of which the specimens needs to be representative. The axis in the specimens have to be parallel into the axis from the cylinder.
Reheat therapy is licensed for rejected cylinders. Subsequent thereto, cylinders have to go all prescribed exams to generally be satisfactory. Maintenance by welding or spinning just isn't licensed.
(iii) If on account of welded attachments on the very best head There is certainly insufficient surface area from which to take a specimen, it could be taken from the consultant head of the identical heat therapy as the test cylinder.
Product need to be recognized by any suitable process other than that plates and billets for hot-drawn cylinders need to be marked with heat range.
(two) In the event the porosity of each and every cylinder is not really known, a cylinder taken at random from lots of 200 or much less has to be examined for porosity. In the event the examination cylinder fails, Every single cylinder while in the whole lot can be examined independently and those cylinders that pass the test are appropriate.