StacksVerified U.S. regulatory reference

46 CFR §177.970

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Piping, including valves, pipe fittings and flanges, conveying vapor, gas, or liquid, the temperature of which exceeds 65.5 °C (150 °F), must be suitably insulated where necessary to prevent injuries.