Section
1 General
1.1 Application
1.1.1 The requirements of this Chapter apply to units with installed dynamic
positioning systems, and are additional to those applicable in other Parts of these
Rules.
1.1.2 A unit provided with a dynamic positioning system in accordance with
these Rules will be eligible for an appropriate class notation which will be
recorded in the Class Direct website.
1.1.3 Requirements, additional to these Rules, may be imposed by the National
Authority with whom the unit 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 is also necessary.
1.1.4 For the purpose of these Rules, dynamic positioning means the provision
of a system with automatic and/or manual control capable of maintaining the heading
and position of the unit during operation within specified limits and environmental
conditions.
1.2 Classification notations
1.2.3 Additional descriptive notes may be entered in the Class Direct website,
indicating the type of position reference system, control system, etc.
1.3 Information and plans required to be
submitted
1.3.2 Details of the limits of the area of operation and heading deviations,
together with proposals for redundancy and segregation provided in the machinery,
electrical installations and control systems, are to be submitted. These proposals
are to take account of the possible loss of performance capability should a
component fail or in the event of fire or flooding, see also
Pt 3, Ch 9, 1.3 Information and plans required to be submitted 1.3.6 and Pt 3, Ch 9, 4 Class notation DP(AA) and Pt 3, Ch 9, 5 Class notation DP(AAA).
1.3.3 Where a common power source is utilised for thrusters, details of the
total maximum load required for dynamic positioning are to be submitted.
1.3.4 Plans of the following, together with particulars of ratings in
accordance with the relevant Parts of the Rules, are to be submitted for:
- Prime movers, gearing, shafting, propellers and thrust
units.
- Machinery piping systems.
- Electrical installations.
- Pressure vessels for use with dynamic positioning system.
1.3.5 Plans of control, alarm and safety sytems, including the following, are
to be submitted:
- Functional block diagrams of the control system(s).
- Functional block diagrams of the position reference systems and
the environmental sensors.
- Details of the electrical supply to the control system(s), the
position reference system(s) and the environmental sensors.
- Details of the monitoring functions of the controllers, sensors
and reference systems, together with a description of the monitoring
functions.
- List of equipment with identification of the manufacturer, type
and model.
- Details of the control systems, e.g., control panels and
consoles, including the location of the control stations.
- Test schedules (for both works’ testing and sea trials) that are
to include the methods of testing and the test facilities provided.
1.3.6 For assignment of a DP(AA) or DP(AAA) notation, a Failure
Mode and Effects Analysis (FMEA) is to be submitted, demonstrating that adequate
segregation and redundancy of the machinery, the electrical installation and the
control systems have been achieved in order to maintain position in the event of
equipment failure, see
Pt 3, Ch 9, 4 Class notation DP(AA), or fire or flooding, see
Pt 3, Ch 9, 5 Class notation DP(AAA). The FMEA is to take a formal and
structured approach and is to be performed in accordance with an acceptable and
relevant National or International Standard, e.g., IEC 60812.
1.3.7 Where the DP notation is to be supplemented with a Performance
Capability Rating (PCR), see
Pt 3, Ch 9, 1.2 Classification notations 1.2.2, the following information is to be submitted
for assignment of a PCR:
- Lines plan.
- General arrangement.
- Details of thruster arrangement.
- Thruster powers and thrusts.
1.3.8 Details of the intended modes of operation are to be submitted. As a
minimum these are to include:
- a description of all the intended operating modes;
- details of the system configuration required for each mode of
operation. When applicable, this is to include the configuration needed to
meet the FMEA requirements of Pt 3, Ch 9, 1.3 Information and plans required to be submitted 1.3.6; and
- the procedures which are to be followed in each operating mode
during normal and abnormal conditions.
1.3.9 A set of the operation and maintenance manuals is to be placed and
retained on board the unit.
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