Definition(s)
Hot Surfaces
Hot surfaces means surfaces with a temperature of less than 220°C including steam systems with a pressure of less than 2.3 N/mm2, thermal oil systems, exhaust gas piping and oilfired and exhaust gas boilers.
Source: IMO MSC.1/Circ.1321, Guidelines for measures to prevent fires in engine-rooms and cargo pump-rooms, 11 June 2009, International Maritime Organization. Regulatory Guidance