In addition L82 paragraph 199 states that changes in MAOP are also notifiable under PSR.
SOL must be notified under PSR regulation 20, schedule 4 and regulation 22, schedule 5. It is intended to redraft this paragraph when the guidance is revised. For the reasons stated above this is an incorrect interpretation. L82 paragraph 54 can be interpreted to imply that MAOP is the same as SOL. The SOL, above which the pressure must not rise under any circumstances, is therefore higher than MAOP. The pipeline can therefore, for limited periods, see pressures above MAOP and still be in code. The recognised standards allow short excursions of pressure above MAOP. Note: SOL for pressure and MAOP are not the same The MAOP is used by the HSE for land use planning purposes. The guidance document L82 paragraph 199 states changes in the MAOP are notifiable. Schedule 5 of PSR specifies as a notifiable event, changes in the SOLs. The guidance document L82 paragraph 52 states that the pipeline operator should ensure that the pipeline is operated within the SOLs. PSR Regulation 11 states the pipeline operator shall ensure that no fluid is conveyed in a pipeline unless the SOLs of the pipeline have been established and that a pipeline is not operated beyond its SOLs.
This is acceptable so long as the SOL is established in compliance with the recognised design standard/code being adopted for the pipeline and in line with the guidance provided below. This document only deals with the pressure SOL.Īlso, it is important to note that the determination of a pipeline pressure safe operating limit (SOL) can vary between recognised pipeline standards/codes. In some cases SOLs will also take into account such matters as fluid velocities and any limits set on the composition of the fluid. The pipeline's SOLs may be specified in terms of maximum operating pressure and maximum and minimum temperature. This document details how the Pipeline Safety Regulations 1996 (PSR) term Safe Operating Limit (SOL) for pressure and the PSR Guidance document (L82) term Maximum Allowable Operating Pressure (MAOP) translate into the pressure terms used in the recognised standards for the UK sector, both onshore and offshore. Pipeline Pressure Limits - Pipelines Safety Regulations 1996 Scope
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