Class notation for Dynamic Positioning with a redundant DP system and an independent joystick system back-up and an additional DP emergency control centre.
The Dynamic Position (DP) system is regarded as being the complete installation necessary for dynamically positioning vessels, and includes a power system, thrusters, DP-control system and the independent joystick system. The class notation requires a back-up dynamic positioning control system in an emergency dynamic positioning control centre, designed with physical separation of components that provide redundancy. The class notation correlates to IMO equipment class 3 for vessels with Dynamic Positioning System.
The notation ensures that the vessel has a system that is sufficient to meet class requirements and IMO guidelines for Dynamic Positioning systems. This notation enables the customer to offer services in operations requiring Dynamic Positioning equipment class 3.
The following documentation is applicable:
Instrumentation and automation; dynamic positioning control and monitoring systems, independent joystick system, thrusters, mode control selection, position reference systems and sensors, power management system
DP control centre and DP emergency control centre arrangement and layout documentation
Failure mode and effect analysis and test program
Programs for test and trials
Electric power system documentation; such as electrical load calculation during dynamic positioning operation
Documentation for cable layout and arrangement of equipment together with documentation for watertight partitions and passive fire protection
Calculation of the environmental regularity number evaluation, ie, the ability to keep in position relative to weather conditions
The scope related to the DP notation covers certification of the DP systems, verification/review of the related machinery systems and extensive testing of the DP functionality. The notation includes FMEA (Failure Mode and Effect Analysis) requirements, and the scope includes a through review of the FMEA and subsequent testing.