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(ii) Taper threads to be of size not less than as specified for American Common taper pipe threads.

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(one) Force, close to similar to but no fewer than services strain, needs to be applied to one particular facet on the completed bottom above a place of not less than 1⁄sixteen of the full space of The underside although not less than 3⁄four inch in diameter, such as the closure, for a minimum of one minute, throughout which period one other side of the bottom subjected to force need to be protected with drinking water and closely examined for indications of leakage. Apart from as supplied in paragraph (n) of the portion, cylinders that are leaking has to be rejected.

(ii) The porous filling materials has to be uniform in high-quality and freed from voids, besides that a properly drilled in the filling content beneath the valve is approved In case the nicely is filled with a material of these kinds of variety which the functions from the filling content are not impaired;

A specimen needs to be removed from just one cylinder of each and every great deal of 200 or less, or welded check plate. The welded examination plate should be of one of several heats inside the great deal of two hundred or much less which it represents, in the identical problem and approximately the same thickness because the cylinder wall except that in no circumstance should it be of the lesser thickness than that demanded for a quarter dimensions Charpy influence specimen. The weld have to be made by the identical techniques and subjected to precisely the same warmth procedure as the foremost weld within the cylinder.

(3) Just about every check cylinder must withstand flattening to nine occasions the wall thickness without cracking. When the alternate bend take a look at is utilized, the take a look at specimens should continue being uncracked when bent inward all-around a mandrel within the route of curvature with the cylinder wall until the inside edges are in a distance aside not better in comparison to the diameter of your mandrel.

indicate the packaging identification markings needed by this element which includes, the place applicable, the name and address or symbol of your packaging manufacturer or approval agency.

(iv) Long term volumetric expansion might not exceed 10 % of the entire volumetric expansion at check force.

(ii) In using the “extension underneath load” system, the full pressure (or “extension underneath load”) comparable to the anxiety at which the 0.two-percent lasting pressure occurs could be established with enough accuracy by calculating the elastic extension of your gauge length beneath correct load and including thereto 0.

(a) Just about every packaging represented as manufactured into a DOT specification or maybe a UN typical should be marked on the non-removable component from the packaging with specification markings conforming to your applicable specification, and with the subsequent:

(iv) A brass fitting could be brazed on the steel manager or flange on cylinders made use of as element aspects of handheld fireplace extinguishers.

Notwithstanding the variation provided On this paragraph, Each and every container have to normally conform into a DOT 2Q container in accordance with § 178.33a. The following situations also utilize underneath Variation one—

(6) Other markings are authorized supplied These are made in low anxiety parts apart from the side wall and so are not of the dimensions and depth that may develop dangerous here tension concentrations. Such marks might not conflict with any DOT demanded markings.

(iii) The minimum examination pressure need to be maintained at the very least thirty seconds and sufficiently extended to guarantee full expansion. Any inner strain utilized immediately after warmth-procedure and prior to the Formal take a look at might not exceed 90 p.c from the check stress.