Catalina Cylinders — Hazardous Materials Safety Interpretation

Page 1U.S. Department of Transportation 400 Seventh Street, S.W. Washington, D.C. 20590 Pipeline and Hazardous Materials Safety Administration MAY 23 2006 Mr. E.A. Ward Dekker, Jr. Ref. No. 06-0064 QA Manager Catalina Cylinders 12452 Monarch Street Garden Grove, California 92841 Dear Mr. Dekker: This responds to your inquiry (facsimile) regarding the manufacture of a DOT 3AL cylinder for oxygen enriched air, air with oxygen content greater than 22-23%, under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Your questions are paraphrased and answered as follows: Q1. Do aluminum cylinders for oxygen enriched air have to conform to § 173.302(b)? Al. Gas mixtures with oxygen concentrations greater than 23.5% should be considered to cause or contribute to combustion of other material to a greater extenting, nos and must me lasted and descrid is Divisiose zas, (nonflammable gas) primary hazard and a Division 5.1 (oxidizer) subsidiary hazard. If the oxygen concentration is greater than 23.5%, then the conditions specified in § 173.302(b) must be met. Q2. Must a residual hydrocarbon test be performed? A2. Yes. The cylinders must conform to the cleanliness standards in Federal Specification RR-C 901C, paragraph 4.4.2.2. Q3. Must the cylinder be designed to a maximum service pressure of 3000 psi? 173.302 (b) 060064#

Page 2A3. No, the cylinder may have a higher marked service pressure. The pressure in each cylinder may not exceed 3000 psi at a temperature of 21°C (70°F). Also, see § 173.301(a)(8). I hope this satisfies your inquiry. If we can be of further assistance, please contact us. Sincerely, John'A. Gale Office of Hazardous Materials Standards Chief, Standards Development#

Page 3Page 1 of 2 Drakeford, Carolyn <PHMSA> From: Mitchell, Hattie <PHMSA> Sent: Tuesday, March 14, 2006 7:56 AM Engrum To: Staniszewski, Stanley <PHMSA›; Drakeford, Carolyn <PHMSA> $173.302(6) Co: Hochman, Charles <PHMSA> Subject: FW: Oxygen Enriched Air Aluminum SCUBA Cylinders Interpretation Please Cylinders Stan: Yes, will do. Carolyn: please log in as an interp. 06-0064 Thanks, Hattie Sent: Tuesday, March 14, 2006 7:40 AM From: Staniszewski, Stanley <PHMSA> To: Mitchell, Hattie < PHMSA> <PHMSA> Cc: Hochman, Charles <PHMSA>; Freeman, Cheryl <PHMSA>; Toughiry, Mark <PHMSA>; Staniszewski, Stanley Subject: FW: Oxygen Enriched Air Aluminum SCUBA Cylinders Interpretation Please Thanks, Stan From: Ward Dekker [mailto:wdekker@catalinacylinders.com] To: Staniszewski, Stanley <PHMSA> Sent: Mon 3/13/2006 1:56 PM Cc: John Harris; Tom Newell Subject: Oxygen Enriched Air Aluminum SCUBA Cylinders Interpretation Please Stan, If this inquiry for inerpretation should go to someone else, let me know. As you know Catalina Cylinders manufactures 6061 aluminum cylinders in accordance with 49 CFR178.46. For oxygen cylinders we manufacture the cylinders in compliance with 49 CFR173.302(b). We manufacture SCUBA cylinders for air use. In some cases, the cylinders are being charged and used with oxygen enriched air, air with O2 content greater than 22 - 23%. Here's my interpretation request. 49CFR173.302(b)? 1. Do aluminum cylinder that are manufactured for oxygen enriched air have to manufactured im accordance with 3/14/2006#

Page 4Page 2 of 2 Meaning, a. Must a residual hydrocarbon test be performed? and b. Must the cylinders be designed to a maximum service pressure of 3000 psi? Regards, QA Manager E.A. Ward Dekker, Jr. 714 890-0999 Catalina Cylinders / Garden Grove Facility 3/14/2006#