Ask X3What does 49 CFR 173.302 (Filling of cylinders with nonliquefied (permanent) compressed gases or adsorbed gases) require?
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As an Ask X3 fleet-compliance assistant, here is what 49 CFR 173.302 requires for motor-carrier owners:
* General Requirements:
* A cylinder filled with a non-liquefied compressed gas must be offered for transportation in accordance with 49 CFR 173.302 and § 173.301.
* DOT specification cylinders must also meet §§ 173.301a, 173.302a, and 173.305, as applicable.
* UN pressure receptacles must meet §§ 173.301b and 173.302b, as applicable.
* If more than one section applies, you must follow the most restrictive requirements.
* Adsorbed Gas: Cylinders filled with an adsorbed gas must be offered for transportation per paragraph (d) of 49 CFR 173.302, along with §§ 173.301 and 173.302c (and UN cylinders must meet §§ 173.301b and 173.302b where applicable, following the most restrictive rule if multiple sections apply).
* Aluminum Cylinders in Oxygen Service: Each aluminum cylinder filled with oxygen must meet these specific conditions:
* Valve metallic parts contacting the oxygen must be brass or stainless steel.
* Cylinder openings must use straight threads only (except for UN cylinders).
* Cylinders must be cleaned to specific standards (ISO 11621 for UN pressure receptacles; GSA Federal Specification RR-C-901D for DOT cylinders), and tested for oil contamination.
* The pressure in each cylinder must not exceed 3000 psig at 21 °C (70 °F).
* Live Fish Transport: Authorized cylinders containing oxygen continuously fed to tanks with live fish may be transported.
* Division 2.1 Materials: Shipments of Division 2.1 materials in aluminum cylinders are authorized exclusively by motor vehicle, rail car, or cargo-only aircraft.
* DOT 3AL Cylinders (6351-T6 Aluminum Alloy): Safeguards must protect personnel and facilities during filling if failure occurs in SCUBA, SCBA, or oxygen service, restricting the filling area to essential individuals only.