Clasification Society Provisional Rules - Provisional Rules for the Construction and Classification of Submarine Pipelines, January 2008 - Chapter 1 Provisional Rules for the Construction and Classification of Submarine Pipelines - Section 14 Operation and repairs
Section 14 Operation and repairs
14.1 Operation procedures
14.1.1 A written operation procedure is to be prepared and issued prior to the pipeline being put into operation. One operation may, where applicable, cover several pipelines of the same type.
14.1.2 Where one pipeline forms part of a system covering other lines, platforms, terminals etc. the operating procedure is to embrace those parts of the entire system which are relevant to the operation of the line.
14.1.3 In order to minimise the risk of damage to the pipeline, it is the Owners'/ Operators' responsibility to ensure that supply boat approach routes to the installation are to be strictly controlled. A mooring procedure is to be produced which clearly indicates safe and hazardous anchoring areas.
14.1.4 Operation procedures are to be written in English with translations into other languages as necessary for the operating personnel involved.
14.2 Control and monitoring
14.2.1 Control of the pipeline is to be effected from a clearly defined control centre, provided with sufficient instrumentation to indicate the conditions at each end of the pipeline and to ensure effective control and shutdown.
14.2.2 Where more than one control centre is provided e.g. at both ends of the pipeline, the arrangements are to be such that only one control centre can start up the pipeline at a given time. Clear indication is to be provided to show which centre is in control.
14.2.3 Two independent means of voice communication are to be provided between both ends of the pipeline and the control centre(s).
14.2.4 Alarms displayed in a control centre are to be audible and visual. An alarm event recorder is to be provided.
14.2.5 Means are to be provided for the monitoring of leaks and ensuring the integrity of the pipeline, and consideration should be given to the:
- continuous mass balance of the pipeline;
- continuous volumetric balance corrected for temperature and pressure of the pipeline;
- continuous monitoring of rate of change of pressure;
- continuous monitoring of rate of change of flow;
- low-pressure alarms;
- high-flow alarms;
- reverse flow alarms.
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