Section 4 Machinery arrangements

4.1.1 Piping arrangements for the recovered oil system are to be located outside machinery spaces and are to have no connections to such spaces.

4.1.2 When the ship is in oil recovery mode, means are to be provided to isolate the oil recovery system from any other system to which it may be connected.

4.1.3 For assignment of the notations Oil Recovery or Oil Recovery Ship, ventilation outlets from the recovered oil tanks are to have a minimum height of 2,4 m above deck and be fitted with flame screens. Temporary pipe sections may be used for this purpose. Outlets are to be located not less than a 5 m radius from the nearest air intakes and openings to accommodation and enclosed spaces containing a source of ignition and from deck machinery and equipment which may constitute an ignition hazard.

4.1.4 Each recovered oil tank is to be fitted with suitable means of ascertaining the liquid level in the tank. Sounding pipes or other approved devices are acceptable for this purpose.

4.2.1 Pump rooms are to be fitted with a permanent ventilation system of the mechanical extraction type.

4.2.2 The ventilation system is to be capable of being operated from outside the compartment being ventilated and a notice is to be fixed near the entrance stating that no person is to enter the space until the ventilation system has been in operation for a specified period, sufficient to achieve at least five air changes based on the gross volume of the space.

4.2.3 The ventilation system is to be capable of at least six air changes per hour, based on the gross volume of the space.

4.2.4 Protection screens of not more than 13 mm square mesh are to be fitted outside openings of ventilation ducts, and ventilation intakes are to be so arranged as to minimise the possibility of recycling hazardous vapours from any ventilation discharge opening. Vent exhausts are to be arranged to discharge to a safe place on the open deck and comply with the requirements of Pt 7, Ch 5, 4.2 Pump room for recovered oil 4.2.5.

4.2.5 The vent exhausts from pump rooms are to discharge at least 3 m above deck, and from the nearest air intakes or openings to accommodation and enclosed working spaces, and from possible sources of ignition.

4.2.6 Ventilation fans to be constructed in accordance with Pt 5, Ch 15, 1.8 Cargo pump-room ventilation.

4.2.7 Pump rooms are to have no direct communication with machinery spaces.

4.2.8 The requirements of Pt 7, Ch 5, 4.2 Pump room for recovered oil 4.2.1 to Pt 7, Ch 5, 4.2 Pump room for recovered oil 4.2.6 are not applicable for assignment of the notation Oil Recovery (F.P. >60°C).

4.2.9 Pump rooms for recovered oil on board ships to be assigned the notation Oil Recovery (F.P. >60°C) are to satisfy the relevant requirements of Pt 5, Ch 1, 4.5 Ventilation.

4.2.10 Bilge drainage of the pump room is to be effected by pumps or bilge ejector suctions. For ships of less than 500 gross tons, the pump room bilge may be drained by a hand pump having a 50 mm bore suction.

4.3.1 Where machinery spaces adjacent to recovered oil tanks are permitted by Pt 7, Ch 5, 3.1 Structural arrangement 3.1.7, the ventilation arrangements are to comply with Pt 7, Ch 5, 5.4 Ventilation 5.4.1 and Pt 7, Ch 5, 5.4 Ventilation 5.4.1.(b).

4.4.1 For assignment of the notations Oil Recovery, Oil Recovery Ship or Oil Recovery (F.P. >60°C), the exhaust lines of engines, boilers and equipment containing sources of ignition and the vents of engine crank cases are to be fitted with suitable spark arrestors.

4.4.2 For assignment of the notations Oil Recovery or Oil Recovery Ship, the exhaust lines of engines, boilers and equipment containing sources of ignition and the vents of engine crank cases are to be led to a position outside any hazardous area as defined in Pt 7, Ch 5, 5.3 Hazardous areas.

4.4.3 For assignment of the notation Oil Recovery (F.P. >60°C), the exhaust lines of engines, boilers and equipment containing sources of ignition and the vents of engine crank cases are to be fitted with suitable spark arrestors.

4.5.1 Low sea suctions are to be provided to supply water for the machinery and all fire pumps.

4.5.2 Means are to be provided to enable heating coils in recovered oil tanks and adjacent tanks to be blanked off during recovery operations.

4.5.3 The heating medium supply and return lines are not to penetrate the recovered oil tank plating, other than at the top of the tank, to reduce the possibility of the recovered oil entering the heating system in the event of a failure of the heating pipework within the tank.

4.5.4 If required to facilitate discharge operations, steam returns are to be led to an observation tank which is to be in a well-ventilated and well-lighted part of the machinery space remote from the boilers.