Each exhaust pipe from an internal combustion engine which is within reach of personnel must be insulated or otherwise guarded to prevent burns. On a new vessel, each pipe that contains vapor, gas, or liquid that has a temperature exceeding 150 °F (65.5 °C) which is within reach of personnel must be insulated where necessary or otherwise guarded to prevent injury.
source: USCG-2006-24412, 81 FR 40101, June 20, 2016, unless otherwise noted.
cite as: 46 CFR 144.830