{"operation":"document","citation":"20-0066","title":"Paul Horgan — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2020-11-23","effective_on":null,"summary":"20-0066 concerning 180.407.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-20-0066.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-20-0066.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-20-0066","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/74566/200066.pdf","body":"<<<PAGE 1>>>\n\nU.S. Department\nof Transportation\nPipeline and Hazardous\nMaterials Safety\nAdministration\n1200 New Jersey Avenue, SE\nWashington, DC 20590\nNovember 23, 2020\nPaul Horgan\n353 Porter St.\nWoodland, CA 95695\nReference No. 20-0066\nDear Mr. Horgan:\nThis letter is in response to your August 20, 2020, email requesting clarification of the\nHazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to the requirements\nin § 180.407 pertaining to testing and inspection of specification cargo tanks. Specifically, you\nask whether inspection of a cargo tank using the wet fluorescent magnetic particle method is\nrequired for MC330 and 331 cargo tanks in dedicated carbon dioxide refrigerated liquid service.\nIn addition, you ask whether carbon dioxide refrigerated liquid is considered a source of stress\ncorrosion cracking in SA 517E type steel, quenched and tempered cargo tanks.\nThe need to use the wet fluorescent magnetic particle method must be determined by the cargo\ntank motor vehicle (CTMV) owner and the Registered Inspector (RI) performing the inspection\nof the CTMV based on knowledge and experience of MC 330 or 331 in this service. As\nprovided in § 180.407(g)(3), the wet fluorescent magnetic particle method must be performed to\ninternally inspect a cargo tank used to transport any hazardous material that may cause stress\ncorrosion cracking prior to and in conjunction with the performance of the pressure test\nrequirements. Furthermore, the CTMV owner and the RI may use publicly available information\nor rely on their operations and maintenance records to aid in determining whether a hazardous\nmaterial may cause stress corrosion cracking and the necessary method for inspection.\nI hope this information is helpful. Please contact us if we can be of further assistance.\nSincerely,\nDirk Der Kinderen\nChief, Standards Development Branch\nStandards and Rulemaking Division\n\n<<<PAGE 2>>>\n\nCasey\n20-0066\nFrom: DerKinderen, Dirk (PHMSA)\nTo: Dodd, Alice (PHMSA)\nCc: Kelley, Shane (PHMSA); Foster, Glenn (PHMSA)\nSubject: FW: Wet Fluorescent Magnetic Particle Testing of MC330/331 Cargo Tanks in Dedicated Carbon Dioxide\nRefrigerated Liquid make with SA 517E, 115KSI steel.\nDate: Tuesday, August 25, 2020 9:42:38 AM\nAttachments: image002.png\nAlice,\nPlease enter into the system as a request for an interpretation. Leonard notes that this was also\nsent to the HMIC so doublecheck our FMP records so we don’t have duplicate interps on this.\nThanks,\nDirk\nFrom: Majors, Leonard (PHMSA)\nSent: Friday, August 21, 2020 1:32 PM\nTo: DerKinderen, Dirk (PHMSA) <Dirk.DerKinderen@dot.gov>\nCc: Freeman, Cheryl (PHMSA) <cheryl.freeman@dot.gov>; Bomgardner, Paul (FMCSA)\n<paul.bomgardner@dot.gov>\nSubject: FW: Wet Fluorescent Magnetic Particle Testing of MC330/331 Cargo Tanks in Dedicated\nCarbon Dioxide Refrigerated Liquid make with SA 517E, 115KSI steel.\nHello Dirk,\nI received the email below from an industry representative. He has a question about the Wet\nFluorescent Magnetic Particle Testing for a MC-330/331 cargo tank motor vehicle. This request was\nalso sent to the PHMSA Information Center. I believe it is in the best interest of the Office of\nHazardous Materials Safety to give a formal response. My concern is any answer provided from PHH-\n22 may be considered guidance or additional regulatory burden.\nPlease let me know if you want to chat on how to handle this issue. FMCSA is aware of these\nquestions.\nThanks,\nLeonard J. Majors\nDivision of Sciences, Engineering and Research\nUS Department of Transportation\nPipeline and Hazardous Materials Safety Administration\n1200 New Jersey Avenue, SE, Washington D.C. 20590\nOffice: 202.366.4545\nPHMSA Home | LinkedIn | Twitter | HAZMAT | OPS\n\n<<<PAGE 3>>>\n\nFrom: Paul Horgan [mailto:hmctman@gmail.com]\nSent: Thursday, August 20, 2020 7:17 PM\nTo: INFOCNTR (PHMSA) <INFOCNTR.INFOCNTR@dot.gov>; Majors, Leonard (PHMSA)\n<leonard.majors@dot.gov>; Bomgardner, Paul (FMCSA) <paul.bomgardner@dot.gov>\nSubject: Re: Wet Fluorescent Magnetic Particle Testing of MC330/331 Cargo Tanks in Dedicated\nCarbon Dioxide Refrigerated Liquid make with SA 517E, 115KSI steel.\nCAUTION: This email originated from outside of the Department of Transportation (DOT). Do not click on links or\nopen attachments unless you recognize the sender and know the content is safe.\nOn Thu, Aug 20, 2020 at 4:06 PM Paul Horgan <hmctman@gmail.com> wrote:\nDoes 180.407(g)(3) below, require wet fluorescent magnetic particle testing of MC330/331\ncargo tanks in dedicated carbon dioxide refrigerated liquid service?\nIs dedicated carbon dioxide refrigerated liquid considered to create stress corrosion\ncracking in SA 517E, 115KSI QT cargo tanks?\nIt appears that pure carbon dioxide does not create stress corrosion cracking without the\npresence of water, oxygen or other contaminants. What is PHMSA's position on the\ndedicated CO2 service in Qt cargo tanks?\nI found a NACE and DOE (OSTI) article on the Stress Corrosion Cracking (SCC) for\ncarbon dioxide (CO2) in reference to pipeline transportation of aqueous solutions of CO2\nand water. They even mention that dehydration of the aqueous solution will eliminate the\nSCC. Another article with CO2, water and carbon monoxide causing SCC.\nHere are links to the articles and the abstract.\nhttps://www.osti.gov/biblio/6698176-internal-stress-corrosion-cracking-aqueous-solutions-\nco-co-sub\nhttps://www.osti.gov/servlets/purl/5870161\nhttps://scholars.uow.edu.au/display/publication97457\nhttps://www.sciencedirect.com/topics/engineering/carbon-dioxide-corrosion\nhttps://www.sciencedirect.com/topics/engineering/carbon-dioxide-corrosion\nInternal stress-corrosion cracking by aqueous solutions of CO and CO2\n\n<<<PAGE 4>>>\n\nAbstract\nBattelle Columbus Laboratories study of stress-corrosion cracking (SCC) of line-\npipe steel in aqueous solutions of CO and CO/sub 2/ revealed that pipeline steels\nare susceptible to SCC at partial pressures of CO/sub 2/ and CO as low as 1 psi\n(6.9 kPa). For SCC to occur, carbon dioxide, carbon monoxide, and water must be\nsimultaneously present. The SCC morphology involves multiple, transgranular\ncracks perpendicular to the direction of maximum tensile stresses in the steel. The\nsurest method for control of CO-CO/sub 2/ SCC is to prevent condensation by\ncontrolling the gas composition and keeping the temperature above the dewpoint.\nAdequate dehydration of the gas prior to injection in the pipeline will prevent\nSCC, even for gas compositions that would promote severe SCC in the presence\nof water. The removal of CO/sub 2/ and CO does not appear to be practical\nbecause of the low levels of these gases that will still support SCC. In current\nindustry practice, carbon dioxide levels are controlled to 10 psi (69 kPa) or less for\ncontrol of general corrosion and pitting; however, no limits on CO have been\nestablished. In the presence of water, small amounts of CO can promote SCC at\nCO/sub 2/ concentrations that are acceptable for general-corrosion considerations.\nOxygen in the gas greatly increases the severity of SCC and should be avoided\n180.407(g)(3) Each MC 330 and MC 331 cargo tank constructed of quenched and\ntempered steel in accordance with Part UHT in Section VIII of the ASME Code\n(IBR, see §171.7 of this subchapter), or constructed of other than quenched and\ntempered steel but without postweld heat treatment, used for the transportation of\nanhydrous ammonia or any other hazardous materials that may cause corrosion\nstress cracking, must be internally inspected by the wet fluorescent magnetic\nparticle method immediately prior to and in conjunction with the performance of the\npressure test prescribed in this section. Each MC 330 and MC 331 cargo tank\nconstructed of quenched and tempered steel in accordance with Part UHT in\nSection VIII of the ASME Code and used for the transportation of liquefied\npetroleum gas must be internally inspected by the wet fluorescent magnetic particle\nmethod immediately prior to and in conjunction with the performance of the\npressure test prescribed in this section. The wet fluorescent magnetic particle\ninspection must be in accordance with Section V of the ASME Code and CGA\nTechnical Bulletin TB-2 (IBR, see §171.7 of this subchapter). This paragraph does\nnot apply to cargo tanks that do not have manholes. (See §180.417(c) for reporting\nrequirements.)\n--\nPaul Horgan\n530-304-4590\n--\nPaul Horgan\n\n<<<PAGE 5>>>\n\n530-304-4590","truncated":false,"body_characters":8393}