(iv) Additional delivered that wall worry for cylinders acquiring copper brazed longitudinal seams might not exceed 95 p.c of any of the above values. Calculated wall thickness may not include things like galvanizing or other protective coating.
(2) Each opening inside of a spherical style of cylinder needs to be presented which has a fitting, boss, or pad of weldable steel securely connected to the cylinder by fusion welding.
(three) When Each and every cylinder is analyzed to your bare minimum exam stress, the least take a look at force should be maintained a minimum of 30 seconds and adequately longer to be sure comprehensive growth. Any interior force utilized following heat-cure and former into the official take a look at might not exceed ninety percent from the exam force.
Only open up hearth, simple oxygen, or electric furnace system steel of uniform quality is approved. The steel Assessment should conform to the following:
(i) The word “spun” or “plug” have to be placed near the DOT specification marking when an close closure while in the completed cylinder has actually been welded through the spinning course of action, or effected by plugging.
(ii) Acquiring a Qualified chemical Examination from the fabric or cylinder manufacturer for each soften, or Solid of material; or
(3) Lots is described as a gaggle of cylinders fabricated from the exact same heat of metal, produced by precisely the same procedure and heat taken care of in the identical products under the exact same conditions of your time, temperature, and ambiance, and could not exceed a quantity of 200 cylinders.
(i) The porous materials might not disintegrate or sag when damp with solvent or when subjected to usual assistance;
(iii) The least exam stress must be preserved at the least thirty seconds and sufficiently extended to be certain total growth. Any inside force utilized soon after heat-treatment and prior to the Formal test may well not exceed ninety percent in the check tension.
(1) In this particular specification, a “lot” usually means a bunch of cylinders successively made obtaining the same:
(iv) Long-lasting volumetric enlargement might not exceed 10 % of the entire volumetric enlargement at test pressure.
(3) The surface of your cylinder need to be insulated. The insulating materials must be fireplace resistant. The insulation on non-evacuated jackets has to be included which has a steel jacket not below 0.060-inch thick or an aluminum jacket not less than 0.070 inch thick, so produced that moisture can not can be found in contact with the insulating materials. If a vacuum is preserved inside the insulation Room, the evacuated jacket has to be designed for a minimal collapsing stress of 30 psig differential no matter whether made from metal or aluminum.
(six) Other markings are approved presented They are really produced in minimal strain spots in addition to the aspect wall and therefore are not of the measurement and depth that may make unsafe pressure concentrations. These types of marks may not conflict with any DOT demanded markings.
(2) If an indication from read more the name of the producer or other identification of your packaging as specified via the capable authority is necessary, the name and address or symbol with the manufacturer or the acceptance agency certifying compliance With all the UN typical needs to be entered. Symbols, if utilized, must be registered Along with the Associate Administrator.