{"operation":"document","citation":"21-0035","title":"Momentive Performance Materials — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2021-06-02","effective_on":null,"summary":"21-0035 response to Momentive Performance Materials concerning 173.32, 178.275.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-21-0035.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-21-0035.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-21-0035","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/75101/210035.pdf","body":"<<>>\n\nU.S. Department\nof Transportation\nPipeline and Hazardous\nMaterials Safety\nAdministration\n1200 New Jersey Avenue, SE\nWashington, DC 20590\nJune 2, 2021\nKirsten Pink\nAMR Supply Chain Regulatory Leader\nMomentive Performance Materials\n260 Hudson River Road\nWaterford, NY 12188\nReference No. 21-0035\nDear Ms. Pink:\nThis letter is in response to your April 5, 2021, letter and subsequent email requesting\nclarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable\nto the pressure relief device settings on a Department of Transportation (DOT) Specification 51\nportable tank to be used in the transportation of “UN1993, Flammable liquids, n.o.s., 3, PG II.”\nSpecifically, you state that it is your understanding that the requirements for the setting of\npressure relief devices on DOT Specification 51 portable tanks are found in § 178.275(g)(6).\nYou seek confirmation that the pressure relief device must be set to start to discharge at a\nnominal pressure of 264 psi (~18.2 bar) for a DOT Specification 51 portable tank with a test\npressure of 360 psi (~24.8 bar).\nParagraph (f)(2) of § 173.32 states that a hazardous material may not be loaded in a DOT\nSpecification 51, DOT Specification 60, an IM or UN portable tank unless the portable tank has\na pressure relief device that provides total relieving capacity meeting the requirements of the\nHMR. The requirements for the setting of pressure relief devices for portable tanks intended for\nthe transportation of liquid and solid hazardous materials are specified in § 178.275(g)(6)(ii).\nThis section states that for shells with a test pressure of more than 4.5 bar, the pressure relief\ndevice must be set to start to discharge at 110% of two-thirds of the test pressure.\n\n<<>>\n\nTherefore, the start to discharge setting on a pressure relief device would be 264 psig (~18.2 bar)\nfor a DOT Specification 51 portable tank with a test pressure of 360 psig (~24.8 bar).\nI hope this information is helpful. Please contact us if we can be of further assistance.\nSincerely,\nT. Glenn Foster\nChief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n\n<<>>\n\nLarson\nFrom: INFOCNTR (PHMSA)\nTo: Dodd, Alice (PHMSA)\nCc: Hazmat Interps\nSubject: FW: Momentive - LOI 49CFR Part 178.275\nDate: Wednesday, April 7, 2021 10:02:03 AM\nAttachments: 2021-04-05_Momentive_LOI 49CFR Part 178.275.pdf\n21-0035\nHi Alice,\nPlease see the attached Letter of Interpretation request.\nLet us know if you need anything from us.\nRegards,\n-Breanna\nFrom: Pink, Kirsten [mailto:kirsten.pink@momentive.com]\nSent: Monday, April 5, 2021 3:24 PM\nTo: INFOCNTR (PHMSA) \nCc: Pink, Kirsten \nSubject: Momentive - LOI 49CFR Part 178.275\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.\nDear Sir or Madam,\nPlease find the attached request for regulatory clarification.\nPlease fee free to contact me should you require any additional information.\nBest Regards,\nKirsten Pink\nAMR Supply Chain Regulatory Leader\nMomentive\nKirsten.pink@momentive.com\n(m) 518-441-8998\nThis message, including attached files, is confidential and intended for the addressees. It may contain information that is proprietary, privileged or\nexempt for disclosure under applicable law. Any unauthorized use and dissemination of the information or copying of this message is strictly\nprohibited. Any views, opinions or conclusions expressed in this message are those of the individual sender and do not necessarily reflect the views of\nMomentive or its affiliates. If you received this message in error, please immediately advise the sender by reply email, delete all copies of this message\nand refrain from printing, copying, or disseminating this message or otherwise using the information in it. Thank you.\nAlthough Momentive routinely screens incoming and outgoing mail messages for viruses, addressees should scan this e-mail and any attachments for\nviruses themselves. Momentive does not guarantee in any way the absence of viruses in this e-mail or any attachments and disclaims any liability in\ncase of security problem that this message may cause to any system.\n\n<<>>\n\nMomentive Performance Materials Inc.\n260 Hudson River Road\nWaterford, NY 12188\nmomentive.com\nLarson\n21-0035\n(6) Setting of pressure relief devices. (i) Pressure relief devices must operate only in\nconditions of excessive rise in temperature. The shell must not be subject to undue\nfluctuations of pressure during normal conditions of transportation.\n(ii) The required pressure relief device must be set to start to discharge at a nominal\npressure of five-sixths of the test pressure for shells having a test pressure of not\nmore than 4.5 bar (450 kPa) and 110% of two-thirds of the test pressure for shells\nhaving a test pressure of more than 4.5 bar (450 kPa). A self-closing relief device\nmust close at a pressure not more than 10% below the pressure at which the\ndischarge starts. The device must remain closed at all lower pressures. This\nrequirement does not prevent the use of vacuum-relief or combination pressure relief\nand vacuum-relief devices.\nKirsten Pink","truncated":false,"body_characters":5298}