(one) Cylinder shells has to be produced through the backward extrusion approach and have a cleanliness degree satisfactory to make certain right inspection. No fissure or other defect is appropriate that is likely to weaken the completed cylinder below the look energy prerequisites.
Open up-hearth or electric powered metal of uniform high quality have to be made use of. A heat of steel manufactured beneath desk one With this paragraph (b), Look at chemical Investigation of that is marginally outside of the specified vary, is acceptable, if satisfactory in all other respects, offered the tolerances revealed in table 2 With this paragraph (b) aren't exceeded apart from as approved because of the Affiliate Administrator. The subsequent chemical analyses are authorized:
(three) Every take a look at cylinder must face up to flattening to 9 periods the wall thickness with no cracking. If the alternate bend exam is applied, the take a look at specimens will have to continue being uncracked when bent inward all-around a mandrel while in the route of curvature of the cylinder wall right until the inside edges are in a length apart not larger compared to the diameter in the mandrel.
(vi) Impact examination specimens should be cooled to the look provider temperature. The equipment for screening the specimens ought to conform to necessities of ASTM Standard E 23. The examination piece, together with the handling tongs, have to be cooled for your period of time sufficient to get to the support temperature.
Marking must be carried out by stamping in to the steel with the cylinder. All markings has to be legible and Situated with a shoulder.
(1) Just about every opening within the container must be offered which has a fitting, boss or pad of weldable chrome steel securely attached into the container by fusion welding.
One container taken at random away from 200 or less needs to be hydrostatically tested to destruction. The rupture pressure need to be provided as Element of the inspector's report.
(iii) When dimension with the cylinder does not permit securing straight specimens, the specimens may very well be taken in almost any site or path and may be straightened or flattened cold, by tension only, not by blows.
The minimum wall thickness should be this kind of the wall strain in the least specified exam tension may not exceed 67 percent on the minimum tensile toughness in the check here metal as decided from the physical and burst tests essential and may not be in excess of 70,000 p.
(2) Each individual opening within a spherical type cylinder needs to be supplied using a fitting, manager, or pad of weldable steel securely attached into the container by fusion welding.
The completed cylinders has to be uniformly and adequately heated previous to assessments. Heat therapy on the cylinders of your approved Assessment should be as follows:
S = Mc/I (iii) To calculate the maximum longitudinal tensile pressure as a consequence of hydrostatic take a look at force, the following components needs to be applied:
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(iv) A brass fitting could possibly be brazed for the metal manager or flange on cylinders utilized as part aspects of handheld fire extinguishers.