Section 3 Positioning, monitoring and control arrangements
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 7 Other Ship Types and Systems - Chapter 6 Arrangements for Offshore Loading - Section 3 Positioning, monitoring and control arrangements

Section 3 Positioning, monitoring and control arrangements

Parent topic: Chapter 6 Arrangements for Offshore Loading

3.1 General

3.1.1 The requirements of this Section are additional to those given in Pt 6, Ch 1 Control Engineering Systems, and Pt 7, Ch 4 Dynamic Positioning Systems and Pt 7, Ch 8 Positional Mooring and Thruster-Assisted Positional Mooring Systems.

3.1.2 If the ship is fitted with a dynamic positioning system, it is at least to comply with the DP(AM) requirements, see Pt 7, Ch 4 Dynamic Positioning Systems.

3.2 Control station

3.2.1 A control station for offshore loading may be arranged within the bow area or on the navigation bridge. All operations concerning positioning of the ship and monitoring of mooring and loading parameters are to be capable of being performed from this station.

3.3 Instrumentation

3.3.1 Bow/stern mooring instrumentation is to monitor:

  1. Mooring line traction.

  2. Chain stopper.

  3. Data logger system for recording of mooring and load parameters.

3.3.2 The mooring system is to be provided with a tension meter capable of continuously indicating the tension during the bow loading operation. Consideration may be given to waiving this requirement for ships fitted with a dynamic positioning system.

3.3.3 Bow/stern/submerged turret loading instrumentation is to be provided as follows:

  1. Indicator for loading connector coupling position.

  2. Cargo valve position indicators.

  3. Cargo tank level indicators and high level alarm.

  4. A system for automatic transfer of signals from the control and safety system, to enable personnel on the offshore terminal to effect control of cargo transfer pump(s) and closing of valve(s) on the terminal.

3.4 Emergency disconnect arrangements for pipeline and mooring

3.4.1 In addition to any automatic disconnection systems, a manually operated backup emergency disconnection system is to be provided. This system is to make possible individual operation of the chain stopper and coupling by-pass locks located in the bow control station.

3.4.2 Where an emergency quick-release system is fitted for the mooring system, an equivalent arrangement is to be provided to release the cargo loading hose outboard of the ship.

3.5 Communication

3.5.1 Main and emergency means of communication are to be provided between the bow control station and the offshore loading terminal. The communication equipment is to be intrinsically-safe.

3.5.2 Continuous communication is to be maintained between the control station and the offshore terminal at all times.

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