(three) On the plate attached to the very best in the cylinder or long term component thereof: enough Place should be still left on the plate to deliver for stamping no less than six retest dates: the plate must be at least one⁄sixteen inch thick and have to be attached by welding or by brazing at a temperature of no less than 1100 °F, all through all edges of your plate.
Mechanical tests need to be executed to determine produce toughness, tensile strength, elongation as being a share, and reduction of spot of material being a share, as follows:
The finished cylinders need to be uniformly and appropriately heated just before checks. Heat procedure of your cylinders from the licensed Evaluation have to be as follows:
(ii) Just one cylinder should be selected from Just about every great deal and be hydrostatically strain tested to destruction. If this cylinder bursts beneath 5 (5) times the company tension, then two added cylinders within the exact whole lot as the previously examined cylinder needs to be picked and subjected to this exam.
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(two) If the porosity of every cylinder just isn't identified, a cylinder taken at random from a lot of two hundred or considerably less must be analyzed for porosity. When the take a look at cylinder fails, Every single cylinder in the large amount may be examined independently and people cylinders that go the exam are appropriate.
(a) Every single container should be manufactured by thermoplastic procedures that could assure uniformity of the completed container. No employed product other than output residues or regrind from your exact same production system can be utilised.
(iv) A brass fitting may be brazed towards the metal manager or flange on cylinders employed as part read more areas of handheld fireplace extinguishers.
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Together with the requirements of § 178.35, the inspector's report for that Actual physical take a look at report, should show the common worth for 3 specimens and also the minimal benefit for a person specimen for every good deal quantity.
(iii) The minimum check tension should be managed at the least thirty seconds and adequately for a longer period to make certain complete growth. Any inner strain used immediately after warmth-remedy and ahead of the Formal check may not exceed ninety % on the check strain.
(ii) In utilizing the “extension underneath load” strategy, the total pressure (or “extension under load”) equivalent to the worry at which the 0.two p.c long lasting pressure happens could be established with adequate precision by calculating the elastic extension from the gauge duration underneath correct load and introducing thereto 0.
Cylinders need to be created using equipment and procedures sufficient making sure that Every cylinder manufactured conforms to the requirements of this subpart. No fissure or other defect is permitted that is likely to weaken the completed cylinder appreciably. A reasonably easy and uniform surface area end is needed. If not initially no cost from this sort of defects, the surface area may very well be machined or otherwise treated to eradicate these defects.
(iii) When size of cylinder does not permit securing straight specimens, the specimens could possibly be taken in almost any location or path and will be straightened or flattened chilly, by tension only, not by blows.