Should water mist be used for protection of gas turbine, diesel engine, gas engine, emergency generator enclosures or rooms and pump rooms on the FPSO?
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The Emergency Generator Room should be designed in accordance with NFPA 2001: "Clean Agent Fire Extinguishing Systems" and complies with Class Rules and SOLAS requirements. The system will include a time delay prior to discharge with alarm and warning lights to allow personnel to evacuate the area prior to discharge.
High expansion foam system should be used instead of water mist for the Pump Room which will be designed in accordance with NFPA 11: "Low, Medium and High Expansion Foam Systems" and complies with Class Rules and SOLAS requirements. The following design and operational elements should be incorporated:
Solubility charts of following inert gasses in Water at Atmospheric Pressure (101.3kPa) are shown below: Gas Name Formula Molecular Weight …