(iv) Long term volumetric expansion may well not exceed 10 percent of the whole volumetric expansion at exam force.
(ii) The bare minimum test stress needs to be maintained at the very least thirty seconds and adequately for a longer time to ensure complete growth. Any interior tension applied right after warmth-therapy and previous on the Formal take a look at might not exceed 90 percent from the take a look at tension.
Cylinders has to be manufactured employing gear and processes adequate in order that Each and every cylinder manufactured conforms to the necessities of this subpart also to the next requirements:
This take a look at may be utilised and should be as essential by CGA Pamphlet C-3. The specimen should be bent right until the elongation on the outer surface area, adjacent to the basis of your weld, among the flippantly scribed gage traces-a to b, is at least 20 %, apart from that this percentage could be decreased for steels having a tensile power in extra of 50,000 psi, as provided in paragraph (k) of this part.
The least wall thickness needs to be such which the wall pressure with the minimum specified check tension may not exceed 67 percent on the bare minimum tensile strength with the steel as decided within the Actual physical and burst checks demanded and might not be above 70,000 p.
Cylinders have to be produced applying devices and processes enough in order that Every single cylinder manufactured conforms to the necessities of the subpart. No fissure or other defect is permitted that is probably going to weaken the completed cylinder appreciably. A reasonably clean and uniform area complete is required. If not at first absolutely free from such defects, the surface can be machined or otherwise handled to remove these defects.
(iii) For the objective of strain measurement, the Preliminary strain need to be set even though the specimen is under a anxiety of 12,000 psi, and also the strain indicator reading through have to be set with the calculated corresponding strain.
(one) Welding or brazing is approved for that attachment of neckrings and footrings which happen to be non-pressure components, and only for the tops and bottoms of cylinders aquiring a provider tension of five hundred psig or considerably less.
Be aware one: This designation may not be restrictive as well as the industrial metal is limited in Assessment as shown On this table.
(iii) The minimal take a look at tension need to be maintained at the very least 30 seconds and sufficiently longer to make sure finish enlargement. Any interior tension read more applied following warmth-treatment and prior to the Formal exam may not exceed 90 p.c of the take a look at force.
Product has to be recognized by any ideal system except that plates and billets For decent-drawn cylinders must be marked with the heat amount.
A person container taken at random away from two hundred or significantly less should be hydrostatically tested to destruction. The rupture stress needs to be incorporated as Element of the inspector's report.
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(6) Intermediate manganese steels may very well be tempered at temperatures not fewer than 1150 °File., and immediately after heat treating Every single cylinder need to be submitted to your magnetic take a look at to detect the presence of quenching cracks. Cracked cylinders have to be rejected and wrecked.