(iii) When dimensions of cylinder does not permit securing straight specimens, the specimens may be taken in almost any site or path and could be straightened or flattened chilly, by tension only, not by blows.
(2) Warmth treatment isn't required once the welding or brazing of weldable small carbon parts to attachments of comparable substance that have been Formerly welded or brazed to the very best or bottom of cylinders and adequately heat addressed, offered these subsequent welding or brazing doesn't develop a temperature in extra of four hundred °F in almost any Section of the very best or base materials.
Tension-retaining materials should be discovered by any ideal strategy that doesn't compromise the integrity from the cylinder. Plates and billets for hotdrawn cylinders needs to be marked with the warmth selection.
Longitudinal seams need to be a cast lap joint structure. When brazed, the plate edge must be lapped a minimum of 8 (8) situations the thickness of the plate, laps getting held in posture, considerably metal to metallic, by riveting or electric powered spot-welding; brazing must be carried out by using a suitable flux and by inserting brazing materials on 1 facet of seam and applying warmth till this product exhibits uniformly alongside the seam of one other side.
Markings on Each individual cylinder need to be by stamping plainly and completely on shoulder, best head, neck or valve protection collar that's completely connected to your cylinders and forming an integral aspect thereof, delivered that cylinders not lower than 0.090 inch thick may very well be stamped about the side wall adjacent to prime head.
(3) Name plates are authorized, furnished that they may be completely and securely connected to the cylinder. Attachment by possibly brazing or welding isn't permitted. Attachment by soldering is permitted presented steel temperature won't exceed 500 °F.
Notwithstanding the variation presented Within this paragraph, Just about every container need to usually conform to the DOT 2Q container in accordance with § 178.33a. The next ailments also apply under Variation one—
(one) Pressurization have to be done hydrostatically among approximately zero psig plus the assistance force in a charge not in surplus of 10 cycles for each moment. Adequate recording instrumentation has to be furnished if gear will be to be remaining unattended for amounts of time.
(ii) In using the “extension beneath load” approach, the full strain (or “extension beneath load”) corresponding to the pressure at which the 0.two per cent lasting pressure takes place could be decided with enough precision by calculating the elastic extension on the gauge duration underneath proper load and incorporating thereto 0.
(i) The remaining cylinders in Just about every good deal need to be force tested from the evidence force, drinking water-jacket or direct enlargement take a look at method as prescribed in CGA C-one. The least take a look at tension needs to be preserved for the specific timeframe as well as the tests tools need to be calibrated as prescribed in CGA C-one.
(b) A UN conventional packaging for which the UN typical is ready forth Within this part could be marked with the United Nations image and various specification markings provided that it totally conforms to the requirements of the section.
(ii) The specimen, special of grip finishes, is probably not flattened. Grip ends may be flattened to in one inch of every conclusion of click here your lessened part. Heating on the specimen for just about any goal isn't licensed.
(i) The porous materials may well not disintegrate or sag when damp with solvent or when subjected to ordinary service;
(iv) A brass fitting may be brazed towards the metal boss or flange on cylinders employed as component parts of handheld hearth extinguishers.