Section 3 Control and supervision of machinery

3.1.1 When machinery, as defined in Pt 6, Ch 1, 1.2 Plans 1.2.2, is fitted with automatic or remote controls so that under normal operating conditions it does not require any manual intervention by the operators then it is to be provided with the arrangements specified in Pt 6, Ch 1, 3.2 Engines for propulsion purposes. Alternative arrangements which provide equivalent safeguards will be considered.

3.1.2 Means are to be provided to prevent leaks from high pressure fuel oil injection piping for main and auxiliary engines dripping or spraying onto hot surfaces or into machinery air inlets. Such leakage is to be collected and, where practicable, led to a collector tank(s) fitted in a safe position. An alarm is to be provided to indicate that leakage is taking place. These requirements may also be applicable to high pressure hydraulic oil piping depending upon the location.

3.2.1 The following systems are to be provided with alarms:

3.2.2 In the case of the lubricating oil system, in addition to the alarm indication as required by Pt 6, Ch 1, 3.2 Engines for propulsion purposes 3.2.1, at complete loss of lubricating oil the engine is to be stopped automatically or alternatively a second and separate alarm is to be provided giving audible and visual warning in the wheelhouse and in the engine room. The circuit and sensor employed for the automatic stop or alarm are to be additional to the alarm circuit and sensor required by Pt 6, Ch 1, 3.2 Engines for propulsion purposes 3.2.1.

3.2.3 In the case of cooling system(s), in addition to the alarm indication as required by Pt 6, Ch 1, 3.2 Engines for propulsion purposes 3.2.1, a shutdown system for excessively high temperature may be fitted which is to be independent of the alarm system.

3.2.4 Prolonged running in a restricted speed range is to be prevented automatically; alternatively, indication of restricted speed ranges is to be provided at each control station.

3.3.1 A system of water level detection is to be fitted which will operate alarms and shut off automatically the oil supply to the burners when the water level falls to a predetermined low level.

3.3.2 The fuel oil is to be shut off automatically from the burners, and alarms are to operate on flame failure and failure of combustion air supply detected by either low pressure at the fan outlet or stopping of the fan motor.

3.3.3 Combustion spaces are to be purged automatically before re-ignition takes place in the event of a flame out on all burners.

3.3.4 For cargo heating systems, circulation pumps are to stop automatically in the event of low level and in the event of low pressure of thermal fluid circulation.

3.4.1 The following systems for auxiliary engines of more than 37 kW (50 shp) are to be provided with alarms:

*These alarms may be combined with an automatic shutdown system, if fitted. Automatic shutdowns for these items are not to be fitted on emergency engines.

3.5.1 The following systems are to be provided with alarms:

3.6.1 Preferred alarms and safeguards are indicated in Pt 6, Ch 1, 3.6 Controllable pitch propellers and transverse thrust units 3.6.2.

3.6.2 In the case of main propulsion systems, means are to be provided to prevent the engines and shafting being subjected to excessive torque due to changes in propeller pitch; alternatively an engine overload indicator may be fitted at each station from which it is possible to control the pitch of the propeller.

3.6.3 Where transverse thrust units are remotely controlled, means are to be provided at the remote control station to stop the propulsion unit.

3.6.4 The following systems are to be provided with alarms:

3.7.1 For power operated steering gear, safeguards and alarms are to be provided as indicated in Pt 6, Ch 1, 3.7 Steering gear 3.7.2 and Pt 6, Ch 1, 3.7 Steering gear 3.7.5.

3.7.2 Provision should be made at the bridge to ensure that the steering gear may be rapidly and effectively transferred to an alternative power and control system, which may be manual.

3.7.3 Where the alternative steering gear system is also power operated, this system should be independent of the main power system.

3.7.4 The control system for the alternative steering gear system required by Pt 6, Ch 1, 3.7 Steering gear 3.7.2 is to be independent of the main steering gear control system.

3.7.5 The following systems are to be provided with alarms:

3.8.1 Where a tank supplying lubricating oil to the sternbush is fitted, it is to be located above the load waterline and is to be provided with a low level alarm.

3.9.1 For a general description and definitions of Liftable wheelhouse systems, see Pt 3, Ch 13, 1 General requirements.

3.9.2 Liftable wheelhouse systems are to be provided with starting and stopping arrangements designed to prevent abrupt accelerations and decelerations when moving the wheelhouse.

3.9.3 Duplicated, independent power supplies, valves, pumps (if required) and hoses to permit emergency lifting and lowering in the event of failure of a duplicated item are to be provided, see also Pt 6, Ch 1, 3.9 Liftable wheelhouse systems 3.9.4.

3.9.4 Easily accessible controls for emergency lifting and lowering is to be provided in the wheelhouse which are to be independent from the main controls.

3.9.5 Cable routing of controls is to be carried out in a reliable way avoiding any possible damage during the operation of the ship or wheelhouse.

3.9.6 Any movement of the wheelhouse is to engage an audible alarm.

3.9.7 Permanent warning notices are to be displayed at accesses to the columns and at control stations indicating potential danger to personnel in the columns due to lifting or lowering movements.

3.9.8 Controls are to be failsafe.

3.9.9 Sufficient cable length should be provided to enable unobstructed movements of the cables when moving the columns. The occurrence of sharp bends in the cables and the possibility of cable damage is to be prevented. Cables are to be suitable for the intended purpose.