One cylinder taken at random out of every lots of cylinders should be hydrostatically tested to destruction.
Mechanical exams must be executed to determine yield strength, tensile strength, elongation to be a proportion, and reduction of area of fabric as a proportion, as follows:
Open-hearth or electric steel of uniform excellent need to be used. A heat of metal produced less than desk 1 Within this paragraph (b), check chemical Assessment of that's somewhat away from the required array, is suitable, if satisfactory in all other respects, delivered the tolerances proven in table 2 Within this paragraph (b) are usually not exceeded other than as authorized because of the Affiliate Administrator. The next chemical analyses are authorized:
Cylinders has to be manufactured applying equipment and processes enough in order that Each individual cylinder created conforms to the necessities of the subpart. No defect is permitted that is probably going to weaken the concluded cylinder appreciably.
(three) Content needs to be determined by an appropriate method that should establish the alloy, the aluminum producer's Forged range, the answer warmth handle batch selection and the ton amount.
(three) Each and every exam cylinder have to face up to flattening to nine moments the wall thickness without having cracking. Once the alternate bend take a look at is applied, the examination specimens will have to remain uncracked when bent inward about a mandrel in the course of curvature with the cylinder wall until finally the inside edges here are in a length aside not larger than the diameter in the mandrel.
(2) Thickness from the cylinder foundation will not be under the prescribed least wall thickness of your cylindrical shell. The cylinder base need to have a primary torispherical, hemispherical, or ellipsoidal interior foundation configuration wherever the dish radius is no greater than one.
(iv) A brass fitting might be brazed on the metal boss or flange on cylinders made use of as element portions of handheld fire extinguishers.
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(three) Name plates are approved, delivered that they may be permanently and securely connected to your cylinder. Attachment by either brazing or welding is not really permitted. Attachment by soldering is permitted offered metal temperature would not exceed five hundred °F.
(vii) The influence Attributes of every list of influence specimens may not be lower than the values in the next table:
Content have to be recognized by any suitable process other than that plates and billets For decent-drawn cylinders needs to be marked with warmth number.
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(four) As a safety precaution, Should the producer elects to make this examination prior to the hydrostatic exam, the company shall design and style the exam equipment so the stress is placed on the smallest region practicable, across the stage of closure, and in order to utilize the smallest achievable quantity of air or gas.
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