Specifications for setting the shutdown levels of the emergency shutdown system

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Regarding the shutdown levels, offshore platforms generally have four levels established: this requirement is mainly specified in the <<Safety Rules for Offshore Fixed Platforms>>. But I’m not sure if there are any guidelines regarding level settings. PS: There are four levels of emergency shutdown for offshore platforms: It is recommended to use the following shutdown levels and corresponding shutdown procedures, but platform operators can determine different shutdown levels and their respective procedures based on specific circumstances. Unit shutdown: It is possible to shut down a single device or a series of devices. Unit shutdown can be achieved automatically or manually. Production shutdown: It is possible to shut off the main valves and wing valves of the wellhead production tree; all equipment involved in production can be turned off, or the crude oil export pipelines can be closed. Production shutdown can be initiated by important monitoring signals from the production system, signals indicating low gauge pressure, signals indicating low pressure in subsea pipelines, signals indicating high pressure in production pipelines, signals of power supply system failures, and signals indicating that all wellhead valves have been closed. Fire shutdown can be triggered directly by a fire detected by the wellhead fusible plug circuit, or it can be initiated automatically as a result of a fire and abnormal conditions detected by combustible gas detectors, or manually after manual confirmation. The fire shutdown should result in: production shutdown, shutdown of all surface safety valves, opening of pressure relief valves, and shutdown of underground safety valves. However, the fire-fighting equipment, communication equipment, boundary lights on the helipad, obstacle lights, fog horns, emergency lighting, as well as power generation and supply equipment must remain in working condition. Final shutdown: In the event of force majeure, before evacuating personnel from the platform, a final shutdown must be carried out.