{"operation":"document","citation":"23-0065","title":"W. R. Grace & Co. — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2024-04-16","effective_on":null,"summary":"23-0065 response to W. R. Grace & Co. concerning 178.275.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-23-0065.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-23-0065.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-23-0065","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-05/230065.pdf","body":"<<<PAGE 1>>>\n\nU.S. Department\nof Transportation\nPipeline and Hazardous\nMaterials Safety\nAdministration\nApril 16, 2024\n1200 New Jersey Avenue, SE\nWashington, DC 20590\nMr. Paul Errichetti\nSr. Mgr., Fleet and Dangerous Goods\nW. R. Grace & Co.\n7500 Grace Drive\nColumbia, MD 21044\nReference No. 23-0065\nDear Mr. Errichetti:\nThis letter is in response to your July 7, 2023, letter requesting clarification of the Hazardous\nMaterials Regulations (HMR; 49 CFR Parts 171-180) applicable to pressure relief devices on\nspecification Department of Transportation (DOT) 51 portable tanks. In your letter, you state that\nyou have a fleet of DOT 51 portable tanks—comprised of both 250 gallon and 430 gallon\ncapacities—with a test pressure of 300 psig and a maximum allowable working pressure\n(MAWP) of 200 psig. Specifically, you ask whether the required pressure relief devices may\nstart to discharge at less than 110% of two-thirds of the test pressure.\nThe answer is no. As provided by § 178.275(g)(6)(ii)—and described in a previous Letter of\nInterpretation (LOI) Ref. No. 21-0035—the required pressure relief devices must be set to start\nto discharge at a nominal pressure of five-sixths of the test pressure for shells having a test\npressure of not more 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). Since the applicable portable tanks have a\ntest pressure of more than 4.5 bar (450 kPa), the start to discharge pressure for the pressure relief\ndevices is required to be set at 110% of two-thirds of the test pressure (220 psig).\nI hope this information is helpful. Please contact us if we can be of further assistance.\nSincerely,\nSteven W. Andrews Jr.\nActing Chief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n\n<<<PAGE 2>>>\n\nPollack\n23-0065\nFrom: INFOCNTR (PHMSA)\nTo: Dodd, Alice (PHMSA)\nCc: Hazmat Interps\nSubject: FW: LOI for 49 CFR 178.275(g)(6)(ii)\nDate: Friday, July 14, 2023 10:56:17 AM\nAttachments: DOT-PHSMA LoI 49CFR178.275(g)(6)(ii) - 07Jul2023.pdf\nHi Alice,\nPlease see the attached interpretation request.\nLet us know if you need anything.\nRegards,\n-Breanna\nFrom: Errichetti, Paul <Paul.Errichetti@grace.com>\nSent: Friday, July 7, 2023 11:11 AM\nTo: INFOCNTR (PHMSA) <INFOCNTR.INFOCNTR@dot.gov>\nSubject: LOI for 49 CFR 178.275(g)(6)(ii)\nCAUTION: This email originated from outside of the Department of Transportation (DOT). Do\nnot click on links or open attachments unless you recognize the sender and know the content\nis safe.\nHi,\nPlease find attached a request for a formal letter of interpretation.\nIf you have questions with regards to this request please contact me via email or my mobile number\nlisted below in my signature.\nThanks,\nPaul Errichetti | Senior Manager, Fleet & Dangerous Goods\nW. R. Grace & Co – Conn. | 7500 Grace Drive, Columbia, MD 21044, USA | T +1 410.531.8215 | M +1\n732.306.0683 | paul.errichetti@grace.com\nTHIS EMAIL AND ANY ATTACHED FILES ARE CONFIDENTIAL AND MAY BE LEGALLY PRIVILEGED. If you are not the addressee, any disclosure,\nreproduction, copying, distribution, or use of this communication is strictly prohibited. If you have received this transmission in error please notify the\nsender immediately and then delete this email.\nOur privacy policy can be found here. At any time, you may change your preferences or remove your data by clicking here. Unsubscribe\n\n<<<PAGE 3>>>\n\nPaul Errichetti\nSr. Mgr., Fleet and Dangerous Goods\nT +1 410.531.8215\nM +1 732.306.0683\nPaul.Errichetti@grace.com\nW. R. Grace & Co.-Conn.\n7500 Grace Drive\nColumbia, MD, USA, 21044\nJuly 7, 2023\nMr. Shane Kelley\nDirector, Standards and Rulemaking Division\nU.S. DOT/PHMSA (PHH-10)\n1200 New Jersey Avenue\nSE East Building, 2nd Floor\nWashington, DC 20590\nDear Mr. Kelley:\nI am contacting the agency on behalf of WR Grace with this formal request for a letter of interpretation regarding the Hazardous\nMaterials Regulations 49 CFR 178.275(g)(6)(ii).\nWe have a fleet of 250 gallon and 430 gallon DOT 51 portable tanks. The tanks have a test pressure of 300 psig and a maximum\nallowable working pressure of 200 psig. Based on the referenced above code, the pressure relief device on these tanks should start to\ndischarge at 220 psig.\nQuestion: Can we set the pressure relief device on these tanks to start to discharge at 200 psig versus 110% of two-thirds of the test\npressure which noted above would be 220 psig?\nIf you have any questions or need clarification to my questions, please feel free to contact me by cell phone at (732) 306-0683 or via\nemail at Paul.Errichetti@grace.com.\nSincerely,\nPaul Errichetti\nPaul Errichetti\nSr. Mgr., Fleet and Dangerous Goods\n1 grace.com","truncated":false,"body_characters":4702}