scope:

The scope for additional class notations DPS and DYNPOS provides technical requirements for design, documentation, certification and testing of systems for dynamic positioning for all types of vessel. These rules do not include requirements or recommendations in regard to vessel operation or other characteristics.

Requirements additional to these rules may be imposed by the national authority with whom the vessel is registered and/or by the administration within whose territorial jurisdiction it is intended to operate. Where national legislative requirements exist, compliance with such regulations will also be necessary.

These rules do not give guidance on the suitability of the different intended technical system configurations, with respect to the vessels various industrial mission(s). Reference is given to the recommended practice: DNVGL-RP-E306 Dynamic positioning vessel design philosophy guidelines.

The requirements in these rules are additional to the rules for main class. In particular see the relevant sections of:

- Pt.4 Ch.1 Machinery systems, general

- Pt.4 Ch.2 Rotating machinery, general

- Pt.4 Ch.3 Rotating machinery - drivers

- Pt.4 Ch.4 Rotating machinery - power transmissions

- Pt.4 Ch.5 Rotating machinery - driven units

- Pt.4 Ch.8 Electrical installations

- Pt.4 Ch.9 Control and monitoring systems.

Application

The additional class notations DPS and DYNPOS apply to all vessels with dynamic positioning systems. This section concerns requirements for two different types of class notation; DPS- series and DYNPOS-series, as defined in Table 2. Both series are characterised and structured in line with the IMO MSC/ DYNPOS-series, as defined in Table 2. Both series are characterised and structured in line with the IMO MSC/ Circ.645 Guidelines for vessels with dynamic positioning systems and IMO MSC.1/Circ.1580 Guidelines for vessels and units with dynamic positioning (DP) systems, see Table 1. The two class notation series differ in their specific requirements, and in general the DYNPOS-series notations require a higher degree of availability and robustness than compared to the DPS-series. For example: DYNPOS(AUTS)/DPS(1), DYNPOS(AUTR)/DPS(2) and DYNPOS(AUTRO)/DPS(3) are notations requiring contrasting levels of redundancy and system separation. Qualifier A may be added to certain notations, thus indicating a requirement for annual survey. The detailed differences are shown in the specific requirements given in this section.