Section 6 Performance Capability Rating (PCR)
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 4 Dynamic Positioning Systems - Section 6 Performance Capability Rating (PCR)

Section 6 Performance Capability Rating (PCR)

Parent topic: Chapter 4 Dynamic Positioning Systems

6.1 Requirements

6.1.1 Where the DP notation is to be supplemented with a Performance Capability Rating (PCR) (see Pt 7, Ch 4, 1.2 Classification notations 1.2.2), the calculation will be carried out using the information specified in Pt 7, Ch 4, 1.3 Information and plans required to be submitted 1.3.7.

6.1.2 Two rating numerals are calculated:

  1. The first numeral represents the percentage of time that the ship can remain on station when subjected to a set of standard environmental conditions (North Sea fully developed) with all thrusters operating.

  2. The second numeral represents the percentage of time that the ship can remain on station when subjected to a set of standard environmental conditions (North Sea fully developed) with the most effective thruster being inoperative.

A typical rating might be (95), (70).

6.1.3 In calculating the PCR, the following parameters are considered:

  1. Thruster force vectors.

  2. Thruster/thruster, thruster/hull and thruster/current interactions.

  3. Sea current loads on the ship.

  4. Wind force on the ship.

  5. Wave drift force on the ship.

6.1.4 Where the ship has been subject to alteration or addition, which may affect the performance characteristics of the DP system, the PCR is to be recalculated.

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