{"operation":"document","citation":"49 CFR 179.202-4","title":"-4 Thickness of plates.","source_type":"regulation","agency":"Pipeline and Hazardous Materials Safety Administration","status":"current","official":true,"published_on":null,"effective_on":"2026-08-18","summary":"The wall thickness after the forming of the tank shell and heads must be, at a minimum, 9/16 of an inch AAR TC-128 Grade B, normalized steel, in accordance with § 179.200-7(b).\n\n[80 FR 26749, May 8, 2015]","machine_formats":{"json":"https://regulus.evalyn.ai/document/49-cfr-179-202-4.json","markdown":"https://regulus.evalyn.ai/document/49-cfr-179-202-4.md"},"app_url":"https://regulus.evalyn.ai/document/49-cfr-179-202-4","source_url":"https://www.ecfr.gov/on/2026-08-18/title-49/section-179.202-4","body":"The wall thickness after the forming of the tank shell and heads must be, at a minimum, 9/16 of an inch AAR TC-128 Grade B, normalized steel, in accordance with § 179.200-7(b).\n\n[80 FR 26749, May 8, 2015]","truncated":false,"body_characters":204}