Electric oil heaters not required to be certified by the above are to have their housing design submitted for review.
13.7.4(b) Fuel oil temperature control. All heaters are to be fitted with a fuel oil temperature indicator and a means of temperature control.
13.7.4(c) Heating media and electric heating. The provisions of 4-6-4/13.5.7(c), (d) and (e) are also applicable to fuel oil heaters.
13.7.4(d) Relief valves. Relief valves are to be fitted on the fuel oil side of the heaters. The discharge from the relief valve is to be arranged to discharge back to the storage tank or other suitable tank of adequate capacity.
13.7.4(e) 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.