[Code of Federal Regulations] [Title 49, Volume 2] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR173.303] [Page 559] TITLE 49--TRANSPORTATION CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 173--SHIPPERS--GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents Subpart G--Gases; Preparation and Packaging Sec. 173.303 Charging of cylinders with compressed gas in solution (acetylene). (a) Cylinder, filler and solvent requirements. (Refer to applicable parts of Specification 8 and 8AL). Acetylene gas must be shipped in Specification 8 or 8AL (Sec. 178.59 or Sec. 178.60 of this subchapter) cylinders. The cylinders shall consist of metal shells filled with a porous material, and this material must be charged with a suitable solvent. The cylinders containing the porous material and solvent, shall be tested with satisfactory results in accordance with CGA Pamphlet C- 12. Representative samples of cylinders charged with acetylene shall be tested with satisfactory results in accordance with CGA Pamphlet C-12. (1) The specific gravity of acetone solvent in acetylene cylinders must be 0.796 or over at 15.5 deg.C. (59.9 deg.F.). (2) The amount of solvent added in the refilling operation must not cause the tare weight of the cylinder to exceed its marked tare weight. The tare weight includes the weight of the cylinder shell, porous filling, valve, safety relief devices and solvent, but without removable cap. (b) Filling limits. The pressure in cylinders containing acetylene gas must not exceed 250 psig at 70 deg.F., and in case the cylinders are marked for a lower allowable charging pressure, at 70 deg.F., then that pressure must not be exceeded. (c) Data requirements on filler and solvent. Cylinders containing acetylene gas must not be shipped unless they were charged by or with the consent of the owner, and by a person, firm, or company having possession of complete information as to the nature of the porous filling, the kind and quantity of solvent in the cylinders, and the meaning of such markings on the cylinders as are prescribed by the Department's regulations and specifications applying to containers for the transportation of acetylene gas. (d) Verification of container pressure. (1) Each day, the pressure in a container representative of that day's compression must be checked by the charging plant after the container has cooled to a settled temperature and a record of this test kept for at least 30 days. (e) Prefill requirements. Before each filling of an acetylene cylinder, the person filling the cylinder must visually inspect the outside of the cylinder in accordance with the prefill requirements contained in CGA Pamphlet C-13, Section 3. [29 FR 18743, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register citations affecting Sec. 173.303, see the List of CFR Sections Affected which appears in the Finding Aids section of the printed volume and on GPO Access. [[Page 560]]