49 C.F.R. 49 CFR--PART 173
Title 49 - Transportation
Effective Date(s): September 11, 2006 29. In §173.303, paragraph (b) is revised and (f) is added to read as follows: * * * * * (b) Filling limits. For DOT specification cylinders, the pressure in the cylinder containing acetylene gas may not exceed 250 psig at 70 °F. If cylinders are marked for a lower allowable charging pressure at 70 °F., that pressure must not be exceeded. For UN cylinders, the pressure in the cylinder may not exceed the limits specified in §173.304b(b)(2). * * * * * (f) UN cylinders. (1) UN cylinders and bundles of cylinders are authorized for the transport of acetylene gas as specified in this section. Each UN acetylene cylinder must conform to ISO 3807–2 (IBR, see §171.7 of this subchapter), have a homogeneous monolithic porous mass filler and be charged with acetone or a suitable solvent as specified in the standard. UN acetylene cylinders must have a minimum test pressure of 52 bar and may be filled up to the pressure limits specified in ISO 3807–2. The use of UN tubes and MEGCs is not authorized. (2) UN cylinders equipped with pressure relief devices or that are manifolded together must be transported upright.
Amendment from June 12, 2006
49 CFR--PART 173
Amendment(s) published June 12, 2006, in 71 FR 33883
§ 173.303 Filling of cylinders with compressed gas in solution (acetylene).
