{"operation":"document","citation":"98-0286","title":"Polar Service Centers — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1999-07-02","effective_on":null,"summary":"98-0286 response to Polar Service Centers concerning 172.102.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-98-0286.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-98-0286.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-98-0286","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/1998/980286.pdf","body":"<<<PAGE 1>>>\n\nUS. Department\nof Transportation\n400 Seventh Streel, S.W.\nResearch and\nWashington, D.C. 20590\nspecial Programs\nAdministration\nJUL\n21999\nMi. Mark Hughes\nPolar Service Centers\nRef. No.\n98-0286\n120 Cedar Springs Road\nSpartansburg, SC 29302\nDear Mr. Hughes:\nThis is in response to your letter dated September 21, 1998,\nand further clarifies our letter of September 4, 1998,\nMC 307 cargo tanks under the Hazardous Materials Regulations\nregarding a suitable corrosion allowance for sulfuric acid in\n(HMR; 49 CFR Parts 171-180).\na certain unlined 316 SS MC 307 cargo tank approved for\nSpecifically, you asked whether\nsulfuric acid in all concentrations meets the allowance\nspecified in special provision B84 (S 172.102).\nconcentrations up to 65.25% and does not apply to\nSpecial provision B84 applies only to sulfuric acid in\nmetallic lining or a suitable corrosion allowance as stated in\nconcentrations greater than 65.25%. The requirements for non-\nspecial provision B84 do not apply to sulfuric acid in\nconcentrations above 65.25%\nIn reference\n'assumed that the original\" design minimum thickness was not\nto the September 4, 1998 letter we sent you, we\ngreater, than 3/16\".\nminimum, thackness, and the designer's corrosion allowance\nThe cargo tank designer's calculated\nshould be used to determine whether or not the remaining\ncorrosion allowance is suitable. i*\nI hope this satisfiesiyour request.\nSincerely,\nDelmer\nF. BiLlings\nChief,\nStandards Development\nOffice of Hazardous Materials Standards\n172.102\n980286","truncated":false,"body_characters":1522}