(1) Each individual cylinder have to be heated and held at the appropriate temperature for at least 1 hour per inch of thickness determined by the most thickness on the cylinder and after that quenched in an appropriate liquid medium using a cooling amount not in extra of 80 percent of water.
(two) When the porosity of every cylinder just isn't acknowledged, a cylinder taken at random from loads of 200 or less have to be examined for porosity. In case the examination cylinder fails, each cylinder from the lot might be tested individually and people cylinders that go the exam are suitable.
(iii) Straight threads, possessing a minimum of four engaged threads, to possess limited match and calculated shear toughness not less than ten times the take a look at tension in the cylinder; gaskets necessary, adequate to prevent leakage.
(ii) In utilizing the “extension under load” process, the full strain (or “extension underneath load”) equivalent to the worry at which the 0.two per cent permanent pressure takes place may be decided with sufficient accuracy by calculating the elastic extension with the gauge size below appropriate load and incorporating thereto 0.
(iii) When size of cylinder won't permit securing straight specimens, the specimens might be taken in any locale or route and could be straightened or flattened cold by force only, not by blows.
Substance need to be identified by any suitable method. Steel stamping of warmth identifications may not be made in almost any spot which is able to ultimately come to be the facet wall in the cylinder. Depth of stamping may well not encroach on the minimum amount prescribed wall thickness of your cylinder.
(2) If the cylinders are heat handled inside of a continuous furnace, two rigidity specimens and a few Charpy effects specimens has to be examined from on the list of cylinders or even a examination ring from each four hours or fewer of generation. Nevertheless, in no scenario may well a take a look at great deal depending on this production period exceed two hundred cylinders.
(one) No defect is permitted that is likely to weaken the completed cylinder appreciably. A reasonably clean and uniform area finish is required. The shell part must be a fairly correct cylinder.
Substance needs to be discovered by any suited system, besides that plates and billets for hot-drawn cylinders need to be marked with the heat number.
Along with the information needed by § 178.35, the record of chemical analyses ought to also involve the alloy designation, and applicable info on iron, titanium, zinc, magnesium and every other applicable component Employed in the construction of your cylinder.
(i) The phrase “spun” or “plug” need to be placed close to the DOT specification marking when an conclude closure from the concluded cylinder has actually been welded through the spinning approach, or effected by plugging.
(iii) The least test tension have to be managed a minimum of thirty seconds and adequately longer to make certain entire growth. Any internal stress applied soon after warmth-procedure and previous to the official test may not exceed ninety percent with the test force.
(two) Each individual cylinder have to satisfy the subsequent supplemental necessity which assumes a cylinder horizontally supported at its two finishes and uniformly loaded above its full size.
(iv) On here a plate attached to the best with the cylinder or long lasting element thereof; sufficient space must be still left within the plate to deliver for stamping at least six retest dates; the plate must be a minimum of 1⁄sixteen inch thick and should be hooked up by welding, or by brazing in a temperature of at the least 1100 °File., all over all edges in the plate;