Section 8 Monitoring and alarms
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 6 Steering Systems - Chapter 1 Steering Gear - Section 8 Monitoring and alarms

Section 8 Monitoring and alarms

Parent topic: Chapter 1 Steering Gear

8.1 Monitoring and alarms

8.1.1 Alarms and monitoring requirements are indicated in Vol 2, Pt 6, Ch 1, 8.1 Monitoring and alarms 8.1.2 to Vol 2, Pt 6, Ch 1, 8.1 Monitoring and alarms 8.1.4 and Table 1.8.1 Alarms.

Table 1.8.1 Alarms

Item Alarm Note
Angular position of the
steering mechanism 		—


Failure

Indication, see Vol 2, Pt 6, Ch 1, 8.1 Monitoring and alarms 8.1.2

See Vol 2, Pt 6, Ch 1, 8.1 Monitoring and alarms 8.1.4
Steering power units, power Failure —
Earthing on AC and DC circuits Fault If galvanically isolated from the ship’s network
Data communication Error Where the data deviates from expected value, sequence or timing
Steering motors Overload Single phase For alarm and running indication locations, see Vol 2, Pt 6, Ch 1, 7.1 Electric power circuits, electric control circuits, monitoring and alarms 7.1.4 and Vol 2, Pt 6, Ch 1, 7.1 Electric power circuits, electric control circuits, monitoring and alarms 7.1.5
Control system Failure See Vol 2, Pt 6, Ch 1, 8.1 Monitoring and alarms 8.1.4
Control system power Failure —
Steering gear hydraulic oil tank level Low Each reservoir to be monitored. For alarm locations, see Vol 2, Pt 6, Ch 1, 7.1 Electric power circuits, electric control circuits, monitoring and alarms
Auto pilot Failure Running indication
Hydraulic oil temperature High Where oil cooler is fitted
Hydraulic lock Fault Where more than one system (either power or control) can be operated simultaneously each system is to be monitored, see Note 1
Hydraulic oil filter differential pressure High When oil filters are fitted
Note 1. This alarm is to identify the system at fault and to be activated when (for example):
  • Position of the variable displacement pump control system does not correspond with given order; or
  • incorrect position of 3-way full flow valve or similar in constant delivery pump system is detected.

8.1.2 The angular position of the steering mechanism is to:

  1. Where the main steering unit is power operated, be indicated at the control station, and other positions as applicable. The angular indication is to be independent of the steering unit control system; and is to indicate any abnormal responses or malfunctions. The logic of such feedback and indications is to be consistent with the other alarms and indications so that in an emergency operators are unlikely to be confused.

  2. Be recognisable in the steering unit compartment, if applicable.

8.1.3 The alarms described in Table 1.8.1 Alarms are to be indicated on the navigating bridge and the additional locations described and are to be in accordance with the alarm system specified by Vol 2, Pt 9, Ch 7 Control, Alerts and Safety Systems

8.1.4 Steering control systems are to be monitored and an audible and visual alarm is to be initiated on the navigation bridge in the event of:

  • failure of the control system, including command and feedback circuits; or
  • unacceptable deviation between the rudder order and actual rudder position and/or unacceptable delay in response to changes in the rudder order.
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