{"operation":"document","citation":"09-0111","title":"Carroll Welding Supply — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2010-12-03","effective_on":null,"summary":"09-0111 response to Carroll Welding Supply concerning 180.212.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-09-0111.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-09-0111.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-09-0111","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2009/090111.pdf","body":"<<<PAGE 1>>>\n\nU.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration\n1200 New Jersey Ave, SE\nWashington, D.C. 20590\nDEC - 3 2010\nMr. Wood Smith\nGeneral Manager\nCarroll Welding Supply\nP.O. Box 1897\nAbilene, TX 79604\nReference No. 09-0111\nDear Mr. Smith:\nThis is in response to your letters asking for clarification of the requirements in § 180.212(b) of\nthe Hazardous Materials Regulations (HMR; 49 CPR Parts 171-180). Specifically, you ask\nabout the type of work that may be done to DOT 3-series cylinders and UN pressure receptacles\nauthorized by a cylinder retester. We have paraphrased your questions and answered them in the\norder you provided. We apologize for the delay in responding and any difficulty this may have\ncaused.\nQl. Under § 180.212(b)(1), maya cylinder requalifier with a valid requalification\nidentification number (RIN) repair a foot ring on a DOT 3-series cylinder by removing it\nand welding a new foot ring in its place provided the repair does not affect the pressure\npart of the cylinder?\nAt. No. Section § 180.212(b)(1) authorizes the removal and replacement of a neck ring or\nfoot ring that does not affect a pressure part of a DOT 3A, 3AA, 3B or UN cylinder when\nthe repair is performed by an authorized repair facility with a valid \"K\" number or a\ncyHnder manufacturer of these types of cylinders. The repair must be performed under\nthe supervision of an inspector and must be performed in conformance with the original\ncylinder specification.\nQ2. Maya cylinder owner, requalifier, or repair facility clean the internal threads of a DOT 3series\ncylinder in any gas service using a thread tap of suitable size for the cylinder?\nDoes insertion of the thread tap constitute a re-threading operation under 180.212(b)(2)?\nA2. Any procedure that causes a non-functioning thread section to function properly is\nconsidered a \"rethreading\" operation for purposes of the HMR. When such operations\nare conducted by a manufacturer of DOT 3 series or UN cylinders, the approval\nprovisions of 49 CPR Part 107, Subpart H, do not apply. If the re-threading is conducted\nby a person other than a manufacturer, the facility must hold an approval issued under the\n\n<<<PAGE 2>>>\n\nprovisions of 49 CFR 107.805. Note that no DOT or UN specification cylinder may be\nre-threaded more than once without the approval of the Associate Administrator for\nHazardous Materials Safety (Associate Administrator). Cleaning the internal neck\nthreads of a cylinder using a tool such as a chaser, brush, or other similar tool is not\nconsider a re-thread or repair on a DOT 3-series cylinder and may be performed by a\ncylinder requalifier.\nQ3. What does the phrase \"repairs not requiring approval\" mean?\nA3. As used in § 180.212, the phrase \"repairs not requiring prior approval\" refers to the two\noperations (removal and replacement of neck rings or foot rings, and rethreading in the\nmanner prescribed) described under that section. The phrase means that the operations\ndescribed may be performed without first obtaining an approval from the Associate\nAdministrator under 49 CFR Part 107, Subpart H.\nI hope this satisfies your request.\nSincerely,\n~¥~~~';:-\nT. Glenn Foster\nChief, Regulatory Review and Reinvention\nStandards and Rulemaking Division\n2\n\n<<<PAGE 3>>>\n\nCARROLL WELDING SUPPLY\nApril 30,2009\n325·673·4204\nFax 325·677·2578\nP.O. Box 1897· 79604\n902 N. 10th St.. 79601\nAbilene, Texas\nEd lNl 0V\\ SO VI\n~'8D. 2.:/2 (b)(rJ\n~I,;\"ders\noq-O' t I\nU.S. DOT\nPHMSA Office ofHazardous Materials Standards\nAttn: PHH-IO\nEast Building\n1200 New Jersey Avenue, SE.\nWashington, DC 20590--0001\nDear Sir/Madam;\nWe are asking for clarification regarding 180.212(b)( I). Paragraph (b) states \"Repairs\nnot requiring prior approval. Approval is not required for the following specific repairs:\"\nOur question relates to that in paragraph (1) regarding the repair and replacement ofa\nfoot ring that does not affect the pressure part ofthe cylinder. Is a cylinder requalifier\nthat holds a valid RIN allowed to repair a foot ring on a cylinder where the foot ring may\nbe removed and a new foot ring welded in place without affecting the pressure part ofthe\ncylinder?\nThank you for your attention to this matter.\nGeneral Manager\nCarroll Welding Supply, Inc.\n\n<<<PAGE 4>>>\n\nCARROLL WELDING SUPPLY\n325-673-4204\nFax 325-677-2578\nP.O. Box 1897- 79604\n902 N. 10th St. - 79601\nAbilene, Texas\nU_S.DOT\nPHMSA Office ofHazardous Materials Standards\nAttn: PHH-IO\nEast Building 1200 New Jersey Avenue, SE.\nWashington, DC 20590-0001\nJuly 6,2009 £d W\\OV1~OVj\n~'80. ?' Z (L,}@)\n~/I YlJers\nOq ... 0 II \\\nDear Sirs:\nThis letter is to request interpretation ofthe regulations in 49CFR. This letter is an\naddendum to my letter ofApri130, 2009, which was received in your office on May 8,\n2009.\nI) § 180.212(b) Repairs not requiring prior approval. Specifically we request\nclariftcation of § I 80.2 I 2(b)(2) regarding the rethreading of internal threads of DOT 3\nseries cylinders.\nA common practice in the chlorine industry is to clean the internal threads of\nDOT 3 series cylinders with a suitable tap. Over time the threads of chlorine\ncylinders become worn. CGA V-I - 2005 Standards for Compressed Gas\nCylinder Valve Outlet and Inlet Connections, Twelfth Edition provide for\noversized valves in both 3/4-14 NGT CL(x) and 1-14 NGT CL(x).\nIn general industry the accepted method ofcleaning internal threads is the use ofa\nthread chase. The thread chase will clean threads without removing metal or\ncutting new threads. While a suitable thread chase may be available for a\nstandard 3/4-14 NGT which would be equivalent to a 3/4-14 NGT CL(1), there\nare no known commercially available thread chasers for the oversized threads.\nCommercially available thread taps for oversized 3/4-14 NGT and 1-14 NGT\nthreads are fluted and fully tapered. Each is specific to the size it is designed for.\nObviously these types oftaps are designed to remove metal and cut new threads.\nThe regulations do not specifically permit, nor do they prohibit the use ofthread\ntaps for cleaning purposes. CGA C-6 - 1993 Standard for Visual Inspection of\nSteel Compressed Gas Cylinders, Seventh Edition also does not address the\nproper method for cleaning internal threads, or the use ofthread taps as cleaning\ntools.","truncated":false,"body_characters":6273}