{"data":{"id":"us/49-cfr-179.12","jurisdiction":"us","citation":"49 CFR 179.12","heading":"Interior heater systems.","body":"(a) Interior heater systems shall be of approved design and materials. If a tank is divided into compartments, a separate system shall be provided for each compartment.\n(b) Each interior heater system shall be hydrostatically tested at not less than 13.79 bar (200 psig) and shall hold the pressure for 10 minutes without leakage or evidence of distress.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart B—General Design Requirements"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"53268bf9ded55bf159186f80b3cbb2d9cb0f2cda613058c416140b82865d064f","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.11","next":"us/49-cfr-179.13"},"notice":"GroundRules: Original legal text. Not legal advice."}