The Temporary Refuge (T.R.) shelter (or safe haven shelter, toxic gas refuge) is a safe and sealed area for the people protection during environmental contamination from poisonous gases which can be present in operating areas where oil and/or gas research, extraction and pre- production are performed. The temporary emergency shelter should be provided on all offshore installations. It is required to have a defined performance standard related to its survivability when exposed to a major accident that includes, but is not limited to, ingress of smoke, flammable and toxic gas. HVAC forms an essential part of this. As the TR is the last space for the crew before abandoning the vessel, rig or platform, the HVAC system should create and maintain a comfortable and safe indoor condition free of any explosive and/or toxic gas-air mixtures. The air quality and pressure inside the TR-zone is than of top priority. This can be created by the special TR pressurisation shelter.
Temporary refuge shelter, safe haven, toxic gas refuge, H2S temporary refuge, TR, TGR, SIP
- Fire and gas detection system send an alarm
- All the personnel run to the muster point near the TR Complex
- The TR F&G system run the emergency sequence operation, close the F&G dampers and lock the external doors
- The diesel generators stop and the electric power is supplied by batteries
- The HVAC system is switched from “fresh air” mode to “full recirculation” mode.
- Is activated the compressed air pressurisation system and the BA system.
- The air lock BA washing system is ready to start
- The air lock doors are unlocked for the first mustering sequence
- A predetermined number of personnel go inside the air lock (the TR doors are still closed)
- Start the BA washing sequence inside the air lock (the air lock doors are now closed)
- A toxic gas analyser verify the absence of gas (if the gas is revealed, start an additional washing sequence)
- The TR rooms doors can be opened.
- Start another mustering sequence (during the mustering, people outside the TR complex waiting for their turn are connected with the outdoor BA Cascade system)
- People inside the TR rooms take their sit or their numbered position, waiting for the rescue vehicle or for the end of the alarm.
- In case of TR evacuation (at the end of the 2 or 3 hours of emergency capacity of the TR), will start the disembarking sequence (through the air lock with only 1 washing sequence).
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