3.1 System arrangements
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.601 – Fire Protection in Machinery Spaces – (Adopted on 29 January 1993) - Annex 1 - F35 Rev.2 1991 - Fire protection of machinery spaces - 3 Thermal oil installations - 3.1 System arrangements

3.1 System arrangements

  .1 The inlet and outlet valves of oil-fired thermal oil heaters and exhaust-fired thermal oil heaters shall be controllable from outside the compartment where they are situated. As an alternative, an arrangement for quick gravity drainage of the thermal oil contained in the system into a collecting tank is acceptable.

  .2 Heating of liquid cargoes with flash points below 60°C shall be arranged by means of a separate secondary system, located completely within the cargo area.

However, a single circuit system may be accepted on the following conditions:

  • system is so arranged that a positive pressure in the coil shall be at least 3 m water column above the static head of the cargo when circulating pump is not in operation,
  • the thermal oil system expansion tank shall be fitted with high and low level alarms,
  • means shall be provided in the thermal oil system expansion tank for detection of flammable cargo vapours. Portable equipment may be accepted.
  • valves for the individual heating coils shall be provided with locking arrangement to ensure that the coils are under stake pressure at all times.

  .3 The thermal oil circulating pumps shall be arranged for emergency stopping from a position outside the space where they are situated.

  .4 Vents from expansion tanks and thermal oil storage tanks of thermal oil heating plants shall be led to open deck.

Parent topic: 3 Thermal oil installations
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