13.5.5(b) Fuel oil temperature control. All heated fuel oil tanks located within machinery spaces are to be fitted with a temperature indicator. Means of temperature control are to be provided to prevent overheating of fuel oil, in accordance with 4-6-4/13.5.5(a).
13.5.5(c) Temperature of heating media. Where heating is by means of a fluid heating medium (steam, thermal oil, etc.), a high temperature alarm is to be fitted to warn of any high medium temperature. This alarm may be omitted if the maximum temperature of the heating medium can, in no case, exceed 220°C (428°F).
13.5.5(d) Steam heating. To guard against possible contamination of boiler feed water, where fuel oil tanks are heated by steam heating coils, steam condensate returns are to be led to an observation tank, or other approved means, to enable detection of oil leaking into the steam system.
13.5.7(e) Electric heating. Where electric heating is installed, the heating elements are to be arranged to be submerged at all times during operation, and are to be fitted with an automatic means of preventing the surface temperature of the heating element from exceeding 220°C (428°F). This automatic feature is to be independent of the fuel oil temperature control and is to be provided with manual reset.
13.5.7(f) ACC, ACCU or ABCU notation. For vessels whose propulsion machinery spaces are intended for centralized or unattended operation (ACC, ACCU or ABCU notation), see 4-9-3/15.1.3.