Temporary refuge shelter (TR), Safe haven cabin, toxic gas refuge, H2S temporary refuge shelter
Why is the temporary refuge (TR) shelter needed?
The Temporary Refuge (T.R.) shelter 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 TR shelter or safe haven cabin should be provided on all offshore installations. The TR 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 or called as safe haven cabin.
Temporary Refuge (TR) shelter, safe haven cabin, toxic gas refuge, H2S temporary refuge shelter
The buildings meet all the requirements of a Temporary Refuge (TR) including but not limited to HVAC shutdown in case of potential toxic gas intrusion, fire damper closure activated by Gas Detectors in case of fire, air locks on doors, and minimum breathable air concentration by air cylinders enough for two hours, and meet requirements of BP GP 44-30, Design and Location of Occupied Buildings in Onshore Facilities. The Temporary Refuges is located to ensure the safety of personnel during the period of time that covers the call to muster until an incident has been investigated and controlled, or successful evacuation of the installation has been completed. The TR shelter have adequate medical and welfare facilities, as well as emergency communications.
The TR shelter is designed for external installation to TR areas with a supply duct to the TR area interior. The TR shelter control panel is designed to be installed internally within the TR area. When the TR shelter is operational the shelter is designed as a fail-safe system, i.e. should the shelter sustain damage or an air seal leaks, then clean air will leak out of the shelter rather than contaminated air being drawn in. TR has the double function as dayroom during normal operation and as Temporary Refuge in case of emergency. During normal operation, the TR shelter is ‘dead’ and closed by gas-tight dampers. It comes operational for emergency situations in emergency.
Operation sequence of TR during emergency situation
Main design features of temporary refuge shelter (TR)
The Temporary Refuge (T.R.) shelter 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 TR shelter or safe haven cabin should be provided on all offshore installations. The TR 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 or called as safe haven cabin.
Temporary Refuge (TR) shelter, safe haven cabin, toxic gas refuge, H2S temporary refuge shelter
The buildings meet all the requirements of a Temporary Refuge (TR) including but not limited to HVAC shutdown in case of potential toxic gas intrusion, fire damper closure activated by Gas Detectors in case of fire, air locks on doors, and minimum breathable air concentration by air cylinders enough for two hours, and meet requirements of BP GP 44-30, Design and Location of Occupied Buildings in Onshore Facilities. The Temporary Refuges is located to ensure the safety of personnel during the period of time that covers the call to muster until an incident has been investigated and controlled, or successful evacuation of the installation has been completed. The TR shelter have adequate medical and welfare facilities, as well as emergency communications.
The TR shelter is designed for external installation to TR areas with a supply duct to the TR area interior. The TR shelter control panel is designed to be installed internally within the TR area. When the TR shelter is operational the shelter is designed as a fail-safe system, i.e. should the shelter sustain damage or an air seal leaks, then clean air will leak out of the shelter rather than contaminated air being drawn in. TR has the double function as dayroom during normal operation and as Temporary Refuge in case of emergency. During normal operation, the TR shelter is ‘dead’ and closed by gas-tight dampers. It comes operational for emergency situations in emergency.
Operation sequence of TR during emergency situation
- Fire and gas detection system send an alarm
- All the personnel run to the muster point near the TR
- 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).
Main design features of temporary refuge shelter (TR)
- Designed for an atmosphere during environmental contamination from poisonous gases
- To provide protection against fire and contaminated environment
- Resist to external Heat Stress due to fire caused by inflammable gas
- To provide recovery to people on board (POB) in case of detection of gas mix including at least: Hydrogen Sulphide, Sulphur Bioxide, inflammable gas such as Methane, Butane, Propane, non-flammable gases as Nitrogen, Carbon Dioxide, Oxygen Deficiency, hazardous exhaust and Temporary smoke with particles suspension
- To provide temporary medical assistance to injured personnel who cannot use standard means of survival
- To provide temporary medical assistance to personnel hosted inside the hospital
- Completely automatically shut down auxiliary systems and dampers of the system after detecting poisonous gases in the outside environment
Key specifications
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Temporary refuge TR shelter, safe haven cabin, toxic gas refuge, H2S temporary refuge shelter
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