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A person cylinder taken at random out of each and every great deal of cylinders need to be hydrostatically tested to destruction.

Mechanical assessments must be carried out to find out yield toughness, tensile toughness, elongation for a share, and reduction of space of material as being a share, as follows:

(three) When Each individual cylinder is tested on the least exam tension, the least examination tension has to be managed at the very least thirty seconds and adequately lengthier to make sure complete expansion. Any interior tension applied right after warmth-remedy and former to your Formal take a look at might not exceed 90 % in the take a look at strain.

(ii) One cylinder must be chosen from Every single whole lot and become hydrostatically stress analyzed to destruction. If this cylinder bursts beneath five (5) instances the services stress, then two more cylinders from your identical whole lot given that the previously tested cylinder has to be chosen and subjected to this exam.

(ii) Circumferential seams must be made by welding or by brazing. Heads hooked up by brazing need to have a driving healthy With all the shell Except the shell is crimped, swedged, or curled around the skirt or flange of The top and have to be extensively brazed right until total penetration from the brazing substance from the brazed joint is secured. Depth of brazing from stop from the shell needs to be a minimum of 4 (4) times the thickness of shell steel.

S = Mc / I Wherever: S = Tensile pressure in psi; M = Bending instant in inch-pounds (wl2/8); I = Second of inertia—0.04909 (D4−d4) in inches fourth; c = Radius (D/2) of cylinder in inches; w = Pounds for each inch of cylinder full of drinking water; l = Length of cylinder in inches; D = Outdoors diameter in inches; d = Within diameter in inches.

A DOT 8AL cylinder is really a seamless steel cylinder having a support force of 250 psig. However, the attachment of heads by welding or by brazing by dipping approach in addition to a welded circumferential overall body seam is authorized. Longitudinal seams aren't approved.

(iii) When the dimension of the cylinder won't permit securing straight specimens, the specimens might be taken in any location or path and will be straightened or flattened chilly, by stress only, not by blows.

(iii) For the objective of pressure measurement, the Preliminary pressure reference need to be established even though the specimen is beneath a worry of twelve,000 psi plus the strain indicator looking through remaining set on the calculated corresponding strain.

A specimen has to be Slash from one particular cylinder of every large amount of 200 or fewer, or even a welded take a look at plate. The welded check plate should be of among the list of heats in the large amount of two hundred or less which it represents, in precisely the same problem and about the exact same thickness as being the cylinder wall other than that it might not be of a lesser thickness than that required for 1 / 4 dimensions Charpy affect specimen. The weld need to be created by the identical procedures and subjected to the exact same warmth remedy as the foremost more info weld to the cylinder.

(iv) A brass fitting may be brazed to the steel manager or flange on cylinders utilized as ingredient portions of handheld fire extinguishers.

Before the initial shipment of any distinct cylinder design and style, cyclic pressurization exams must are actually done on at the least a few representative samples devoid of failure as follows:

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Screening is required on two (two) specimens faraway from a person cylinder or element thereof taken at random out of every great deal of 200 or fewer. Samples have to be taken out following heat remedy as illustrated in appendix A to this subpart.

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