What are the key factors to consider when selecting a DP class and redundancy level for your vessel?

1 DP Class

DP class defines the level of reliability and performance of a DP system. It also indicates the consequences of a single point of failure, such as loss of position, damage, or pollution. The International Maritime Organization (IMO) has established three DP classes: DP-1, DP-2, and DP-3. DP-1 has the lowest reliability and no redundancy. DP-2 has higher reliability and redundancy in the main components, such as power, thrusters, and control systems. DP-3 has the highest reliability and redundancy in all subsystems, including the compartments and fire zones. The DP class you need depends on the type and complexity of your operation, the environmental conditions, and the regulatory requirements.

2 Redundancy Level

Redundancy level refers to the ability of a DP system to cope with failures and faults without losing position. It is related to the DP class, but it also depends on the design and configuration of your vessel. Redundancy level can be expressed as N, N+1, or N+2, where N is the minimum number of components required for normal operation. For example, N+1 means that there is one spare component available in case of failure. The redundancy level you need depends on the risk and impact of losing position, the frequency and duration of failures, and the cost and availability of spare parts.

3 Power Management

Power management is the process of distributing and controlling the electrical power supply for the DP system and other loads on board. Power management is crucial for maintaining the stability and efficiency of the DP system, as well as avoiding blackouts and overloads. Power management can be done manually or automatically, depending on the DP class and redundancy level. For example, DP-1 vessels usually have manual power management, while DP-2 and DP-3 vessels have automatic power management with different modes and settings. The power management you need depends on the power demand and consumption of your vessel, the power generation and distribution capacity, and the safety and environmental standards.

4 Thruster Configuration

Thruster configuration is the arrangement and orientation of the thrusters and propellers on your vessel. Thruster configuration affects the maneuverability and performance of your vessel, as well as the environmental forces and loads acting on it. Thruster configuration can be fixed or variable, depending on the type and size of your vessel. For example, fixed thrusters are mounted on the hull or on pods, while variable thrusters can be rotated or tilted to change their direction and thrust. The thruster configuration you need depends on the shape and weight of your vessel, the water depth and current, and the wind and wave conditions.

5 Control System

Control system is the software and hardware that monitors and controls the DP system and other functions on your vessel. Control system includes sensors, computers, displays, joysticks, alarms, and communication devices. Control system enables you to set and adjust the position and heading of your vessel, as well as to detect and respond to errors and faults. Control system can be simple or complex, depending on the DP class and redundancy level. For example, simple control systems have one or two control stations, while complex control systems have multiple control stations and backup systems. The control system you need depends on the accuracy and stability of your position and heading, the availability and reliability of your data and signals, and the usability and functionality of your interface.

6 Operator Competence

Operator competence is the skill and knowledge of the DP operator who operates and supervises the DP system and other operations on your vessel. Operator competence is vital for ensuring the safety and efficiency of your vessel, as well as for preventing and managing incidents and emergencies. Operator competence can be acquired through training, certification, and experience, depending on the DP class and redundancy level. For example, DP-1 operators need basic training and certification, while DP-2 and DP-3 operators need advanced training and certification. The operator competence you need depends on the complexity and responsibility of your operation, the frequency and severity of challenges and risks, and the quality and support of your organization.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?