{"operation":"document","citation":"23-0106","title":"ATECH Engineering — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2024-05-31","effective_on":null,"summary":"23-0106 response to ATECH Engineering concerning 178.61.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-23-0106.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-23-0106.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-23-0106","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-06/230106.pdf","body":"<<<PAGE 1>>>\n\nU.S. Department\nof Transportation\nPipeline and Hazardous\nMaterials Safety\nAdministration\n1200 New Jersey Avenue, SE\nWashington, DC 20590\nMay 31, 2024\nEdward Mansell\nATECH Engineering\n116 W. Wakefield Ave.\nSikeston, MO 63801\nReference No. 23-0106\nDear Mr. Mansell:\nThis letter is in response to your December 18, 2023, letter requesting clarification of the\nHazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to cylinder\nspecifications. Specifically, you ask questions about the requirements for the heads on\nDepartment of Transportation (DOT) 4BW welded steel cylinders with electric-arc welded\nseams found in § 178.61(b)(2).\nWe have paraphrased and answered your questions as follows:\nQ1. You ask whether the heads on DOT 4BW welded steel cylinders with electric-arc welded\nseams need to meet the specification requirements in Table 1 of Appendix A to Part\n178—Specifications for Steel.\nA1. Per the requirements of § 178.61(b)(2), the heads for DOT 4BW welded steel cylinders\nwith electric-arc welded seams must conform to the specifications in Table 1 of\nAppendix A to Part 178—Specifications for Steel, or the alternative specification\nrequirements for heads as provided in § 178.61(b)(2).\nQ2. You ask for confirmation that the composition limit for “Carbon” indicated in Table 1 of\nAppendix A to Part 178—Specifications for Steel, is a maximum limit for each grade.\nYou also ask whether there is any relation to the requirements in § 178.61(b)(2).\nA2. Table 1 of Appendix A to Part 178—Specifications for Steel, lists three grades for steel,\nwith ranges or maximum composition limits of “Carbon” for each grade. Grade 1 lists a\nminimum and a maximum composition limit for “Carbon”, while grade 2 and grade 3 list\nonly the maximum composition limit for “Carbon”. The steel requirements in\n§ 178.61(b)(1) apply to all parts (shell and heads) of the cylinders whereas § 178.61(b)(2)\n\n<<<PAGE 2>>>\n\nprovides alternative steel composition for the construction of heads on DOT 4BW\ncylinders.\nQ3. You ask whether the low carbon steel for the heads of DOT 4BW cylinders referenced in\n§ 178.61(b)(2) is the same steel referenced in Table 1 of Appendix A to Part 178—\nSpecifications for Steel.\nA3. The answer is no. The term “low carbon steel” listed in § 178.61(b)(2) is not a reference\nto the steel in Table 1 of Appendix A. If low carbon steel, as referenced in\n§ 178.61(b)(2), is used to make DOT 4BW cylinder heads, it must comply with the\nalternative steel composition requirements as detailed in the same subparagraph.\nAdditionally, the thickness of such heads must be determined by using a maximum wall\nstress of 24,000 psi in the formula described in § 178.61(f)(2).\nI hope this information is helpful. Please contact us if we can be of further assistance.\nSincerely,\nSteven Andrews\nActing Chief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n\n<<<PAGE 3>>>\n\nJacobson\n23-0106\nFrom: INFOCNTR (PHMSA)\nTo: Dodd, Alice (PHMSA)\nCc: Hazmat Interps\nSubject: FW: Intrepretation Please\nDate: Tuesday, December 26, 2023 3:04:53 PM\nAttachments: STEEL-INTERPRETATION 12182023.pdf\nHi Alice,\nPlease see the attached interpretation request.\nLet us know if you need anything.\nRegards,\n-Breanna\n-----Original Message-----\nFrom: edmansell@atechengineering.com <edmansell@atechengineering.com>\nSent: Tuesday, December 19, 2023 11:08 AM\nTo: PHMSA HM InfoCenter <PHMSAHMInfoCenter@dot.gov>\nSubject: Intrepretation Please\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.\nGood morning,\nAttached is an official request for interpretation, please confirm you have received in good order.\nKind regards,\nEd Mansell\n417-300-5205\n\n<<<PAGE 4>>>\n\n116 W. Wakefield Ave.\nSikeston, MO 63801\nPhone: 417-300-5205\nedmansell@atechengineering.com\nDecember 18, 2023\nU.S. DOT PHMSA Office of Hazardous Materials Standards\nAttn: PHH-10\nEast Building 1200 New Jersey Avenue, SE.\nWashington, DC 20590-0001\nphmsa.hm-infocenter@dot.gov\nRE: Request for Interpretation\nWe are asking for confirmation, on official letterhead, that the steel for heads under 49CFR §178.61\n“Specification 4BW welded steel cylinders with electric-arc welded seam”:\nA. Need to meet with 49 CFR Appendix A to Part 178 -Specifications for Steel Table 1?\nB. Confirm that carbon percent is the maximum, as indicated in Appendix A to Part 178 -Specifications\nfor Steel Table 1, for each case and there is no restriction or relation with the §178.61(b)(2) below?\nC. Confirm that the low carbon steel referenced in §178.61(b) (2) below, is not the steels reference in 49\nCFR Appendix A to Part 178 -Specifications for Steel Table 1?\n49CFR §178.61 Specification 4BW welded steel cylinders with electric arc welded seam.\nb) Steel.\n(1) The steel used in the construction of the cylinder must be as specified in table 1 of appendix A to this\npart. The cylinder manufacturer must maintain a record of intentionally added alloying elements.\n(2) Material for heads must meet the requirements of paragraph (b)(1) of this section or be open hearth,\nelectric or basic oxygen carbon steel of uniform quality. Content percent may not exceed the following:\nCarbon 0.25, Manganese 0.60, Phosphorus 0.045, Sulfur 0.050. Heads must be hemispherical or\nellipsoidal in shape with a maximum ratio of 2:1. If low carbon steel is used, the thickness of such heads\nmust be determined by using a maximum wall stress of 24,000 psi in the formula described in paragraph\n(f)(2) of this section.\nKind regards,\nEdward Mansell","truncated":false,"body_characters":5627}