(ii) Taper threads need to be of the duration not lower than that specified for American Regular taper pipe threads.

Cylinders needs to be manufactured employing machines and processes ample in order that each cylinder generated conforms to the necessities of the subpart. No defect is permitted that is probably going to weaken the completed cylinder appreciably. A reasonably easy and uniform area end is needed. Heads can be attached to shells by lap brazing or might be fashioned integrally.

A DOT 39 cylinder can be a seamless, welded, or brazed cylinder that has a service force not to exceed eighty % of the check force. Spherical strain vessels are approved and coated by references to cylinders In this particular specification.

Reheat treatment method is licensed for any turned down cylinder in accordance with this paragraph (m). Just after reheat, a cylinder need to pass all prescribed tests With this portion for being acceptable. Repair of brazed seams by brazing and welded seams by welding is considered approved.

(2) When the cylinders are warmth treated in a very ongoing furnace, two stress specimens and a few Charpy effect specimens has to be tested from one of the cylinders or a examination ring from Every single 4 several hours or considerably less of manufacturing. However, in no case may possibly a exam whole lot determined by this production period of time exceed 200 cylinders.

(one) Stress, approximately the same as although not below service strain, must be placed on a person facet from the completed bottom in excess of a location of a minimum of one⁄16 of the entire place of The underside although not under 3⁄four inch in diameter, including the closure, for at least one particular minute, through which era one other aspect of The underside exposed to tension need to be included with h2o and intently examined for indications of leakage.

This test could be employed and has to be as needed by CGA C-3. The specimen needs to be bent until the elongation at the outer surface area, adjacent to the foundation with the weld, between the flippantly scribed gage lines a to b, needs to be a minimum of 20 p.c, except this share can be decreased for steels using a tensile strength in surplus of fifty,000 psig, as furnished in paragraph (k) of the area.

All spun cylinders and plugged cylinders need to be examined for leakage by fuel or air force just after The underside has been cleaned and it is free of charge from all moisture, topic to the following conditions and limits:

(three) Every specimen for The strain and Charpy impression checks need to be taken with the facet wall of a cylinder or from a hoop that has been warmth dealt with with the finished cylinders of which the specimens needs to be agent. The axis in the specimens must be parallel towards the axis on the cylinder.

The minimum wall thickness must be such which the wall anxiety with the bare minimum specified examination stress will not exceed 67 p.c of your minimum amount tensile energy in the metal as determined by the physical assessments essential in paragraphs (j) and (k) of this part.

Cylinders with bottoms shut in by spinning need to be leakage analyzed by location the inside air or gasoline tension at not less than the support stress. Any cylinder that leaks has to be turned down.

A “root” bend exam specimen should be cut from the cylinder or welded take a look at plate, useful for the tensile check specified in paragraph (l)(one) of this section and from every other seam or equivalent welded exam plate if the seam is welded by a procedure different from that used for the major seam.

(b) Every single these 25,000 containers or much less, successively produced a day, shall constitute lots and If your examination container shall fall short, the whole lot shall be here rejected or 10 added containers could be picked at random and subjected for the exam below which failure occurred.

(iv) Long-lasting volumetric expansion might not exceed 10 p.c of the total volumetric enlargement at test strain.