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| Alternative Study on Gas Extinguishing Systems for an Underground Transportation Junction Terminal |
| LIU Xue － zhi，LAN Ting － ting，LIU Lu，GENG Guang － jin |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China |
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Abstract Research purposes: The junction terminal project of urban rail transit has the characteristics of large construction area，functional diversity，many gas extinguishing systems for the electric equipment rooms and huge investment and so on． The gas extinguishing system is an indispensable subsystem of the fire protection system． This paper studies the feasibilities of IG 541 and FM 200 gas extinguishing systems for the large underground transportation junction terminal from the aspects of their fire extinguishing performance，impact on the environment，safety，demand of gas cylinder room，investment，maintenance and the delivery distance of the fire fighting pharmaceuticals，for the purpose of providing the reference to the similar works．
Research conclusions: Through the engineering example，the calculation，analysis，comparison and summary were made for the IG 541 ( Inergen) and heptafluoropropane ( FM 200) systems． Compared with the FM 200，the IG 541 system has the features of small area occupied by the gas cylinder，the flexible combination and distribution，long gas transmission distance，high safety，less impact on environment by extinguishing agent，and low operation cost． As the filling pressure of the IG 541 system is big，the system＇s spray equipment that can prevent the mistaken spray is very important． In addition，the concentration of extinguishing agent used for the electric equipment room where man often stays should be appropriate; Both systems are suitable for the underground project，but they also have the shortcomings that the the big area is needed for the cylinders and the systems are decentralized． These should be improved．
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Received: 21 January 2011
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2011, Vol. 28 
