StacksVerified U.S. regulatory reference

49 CFR §179.12

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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.
  2. (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.