RR-C-901E
Compressed Gas Association (CGA)
CGA G-10.1 - Commodity Specification for Nitrogen
CGA S-1.1 - Pressure Relief Device Standards Part 1 - Cylinders for
Compressed Gases
CGA TB-15 - Requirements for the Post Manufacture Tare Weight
Marking of Cylinders
CGA TB-17 - Test Methods for Evaluating Paints and Coatings on
Refillable Steel Compressed Gas Cylinders
(Application for copies should be addressed to the Compressed Gas Association,
4221 Walney Road, 5th Floor, Chantilly, VA 20151-2923. Electronic copies may be obtained from https://www.cganet.com/.)
3. REQUIREMENTS
3.1 Material, design, and construction. All cylinders shall conform to the specifications found in 49 CFR 178, subpart C. The seamless steel cylinders shall conform to Department of Transportation (DOT) specification 3AA, type 4130X steel in accordance with 49 CFR 178.37. The aluminum cylinders shall conform to DOT specification 3AL in accordance with 49 CFR
178.46. The physical characteristics, accessories and special requirements shall be as specified herein and in the acquisition document. The cylinder shall be newly fabricated within one year of the date of the contract or acquisition order.
3.2 Construction.
3.2.1 Stability. Cylinders shall be true to form and shall be stable in the upright position.
3.2.2 Fragmentation resistance (non-shatterability). The fragment resistance or non- shatterability (shatterproof) characteristics of the cylinder shall be determined by either the resultant wall stress value of the cylinder at the minimum designated test pressure or by the performance of the specified gunfire test (see 4.3.4). Cylinders manufactured to DOT specification 3AA of 4130X steel that are greater than four inches in outside diameter shall have a maximum wall stress of 70,000 psig as stated in 49 CFR 178.37. Cylinders manufactured to DOT specification 3AA of 4130X steel that are less than four inches in diameter shall have a maximum wall stress of 60,000 psig. Cylinders meeting these requirements shall be acceptable as non-shatterable cylinders and shall be steel stamped "NONSHAT". Cylinders manufactured to DOT specification 3AA of 4130X steel that are less than four inches in diameter and have a resultant wall stress value greater than 60,000 psig must pass the gunfire test to be acceptable as shatterproof cylinders. Steel cylinders manufactured of other than 4130X steel to DOT specification 3AA and all aluminum cylinders must pass the gunfire test to be acceptable as shatterproof cylinders.
3.2.3 Impact resistance. When impact resistance is specified (see 6.2), samples of each heat of steel represented in a lot of cylinders shall have a minimum lateral expansion of 0.015 inches or greater than 50 percent fibrous fracture at a temperature not higher than -58 °F (-50 °C) in accordance with ASTM E23. Sub-sized samples from a cylinder wall may be used or a sample
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