{"operation":"document","citation":"11-0158","title":"Corrosion Testing Laboratories, Inc. — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2012-04-23","effective_on":null,"summary":"11-0158 response to Corrosion Testing Laboratories, Inc. concerning 173.137.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-11-0158.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-11-0158.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-11-0158","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2011/110158.pdf","body":"<<<PAGE 1>>>\n\n.J.S. Department\n, )f r ronsoortation\n,;;peiine and Hazardous\nJ'laterials Safety\n\\dministrotion\n.-~ ':evv Jt~rsev ... ~v8nue :::·.E\n• /,;:,n,nc;ton C~l; __ l):j'J()\nAPR 2 3 2012\nMr. Bradley D. Krantz\nV .P. of Laboratory Services\nCorrosion Testing Laboratories, Inc.\n60 Blue Hen Drive\nNewark, DE 19713\nRef. No. 11-0158\nDear Mr. Krantz:\nThis responds to your June 28,2011 request for clarification on§ 173.137(c)(2) of the\nHazardous Materials Regulations (HMR; 49 CPR Parts 171-180). Specifically, you ask if you\nare to use only the corrosion rate criterion stated in § 173.13 7 for determining metal corrosivity\nor are you to use both the corrosion rate and the localized corrosion rate criteria of the UN\nMethod.\nYou may use the UN Manual of Tests and Criteria or other equivalent methods. In a final rule\npublished December 20, 2004 under Docket HM-215G (69 FR 76155), we revised the language\nin§ 173.137 (c)(2) mandating the corrosion test in the UN Manual of Tests and Criteria as the\nonly acceptable test method for determining the corrosivity of a material. That was not our\nintent. In a final rule published December 29,2006 under Docket HM-2151 (71 FR 78596), we\nrevised the language in § 173.13 7( c)(Z) to specify that corrosivity may be determined in\naccordance with methods described in the UN Manual of Tests and Criteria, as well as other\nequivalent methods, such as those described in ASTM G 31-72.\nI hope this answers your inquiry. If you need additional assistance, please contact this office at\n(202) 366-8553.\nSincerely,\nBen Supko\nActing Chief, Standards Development Branch\nStandards and Rulemaking Division\n\n<<<PAGE 2>>>\n\nc\n~ Corrosion Testing Laboratories, Inc.\nJune 28, 2011\nCharles Betts\nDivision Director, Office of Hazardous Materials Standards\nU.S. DOT/PHMSA (PHH-1 0)\nEast Building\n1200 New Jersey Avenue, SE\nWashington, DC 20590-0001\nDear Mr. Betts\nI am writing to obtain your assistance with respect to the testing requirements described in 49\nCFR 173.13 7 (c) (2), Class 8 -Assignment of packing group.\nMy request concerns the criteria to be used for the metal corrosion test. The CFR states a\ncorrosion rate criterion (6.25 mm per year based on mass loss) but the referenced protocol, UN\nManual of Tests and Criteria Part 37, states a corrosion rate (general, based on mass loss) and a\nlocalized corrosion (depth of pitting) criteria.\nAs an independent testing laboratory we ha'-:\"e had the opportunity to perform a number of these\ntests. In 2005, when there was a change in the recommended test protocol from ASTM 31 to the\nUN Method, the CFR stated that the UN Method \"must\" be used. As such, we understood this to\nmean that the criteria of the UN Method (both general corrosion rate and pitting depth) were to\nbe used as well. In 2007, one of my colleagues had an informal discussion with a representative\nof the DOT and he confirmed our interpretation that the localized corrosion criterion of the UN\nmethod is to be included along with the corrosion rate criterion when evaluating the test results.\nSince then, the wording of paragraph (2) was changed to \"The corrosion may be determined in\naccordance with the UN Manual of Tests and Criteria or other equivalent test methods\" Are we\nto use only the corrosion rate criterion stated in 49 CFR 173.137 for determining metal\ncorrosivity or are we to use both the corrosion rate and the localized corrosion rate criteria of the\nUN Method?\nAny clarification you can provide will be greatly appreciated.\nSincerely,\n13ooi-h6\nIs 113·! 37 (c':f3)\nPa.c/<.'~4 &roup \\I-OT5g\n~L~\nV.P. ofLaboratory Services\n60 Blue Hen Drive, Newark, DE !97!3 USA\n(302) 454-8200 • fax (302) 454-8204 • e-mail ctl@corrosionlab.com\na Subsidiary ojCorrosion Probe, Inc.\n12 INDUSTRIAL PARK ROAD • P.O. BOX 178 • CENTERBROOK, CT 06409-0178\nPHONE: (860) 767-4402 • FAX: (860) 767-4407 www.cpiengineering.can","truncated":false,"body_characters":3870}