Arrangement in a fire water system

Abstract

An arrangement in a fire water system, especially for an offshore platform, wherein the system comprises one or more fire water pumps ( 6 ) connected through a pipe system ( 2 - 5 ) to a number of deluge valves ( 812 ) coupled to associate with pipe stretches leading to respective fire sections. The arrangement comprises a distribution manifold ( 2 ) having an upstream side ( 3 ) which is in open connection with the fire water pumps ( 6 ) and with a buffer tank ( 7 ) for water, and having a downstream side ( 4 ) connected to the deluge valves ( 12 ) which are coupled to said pipe stretches, and there is also provided a gas supply means ( 10 ) connected to the buffer tank ( 7 ) and having a pressure which is sufficient to see to it that the water pressure at the upstream side of the distribution manifold does not sink below a predetermined level after activation of the deluge valves ( 12 ). The distribution manifold ( 2 ) and the deluge valves ( 12 ), preferably also the buffer tank ( 7 ) and the gas supply means ( 10 ), are arranged as an integrated unit within a delimited area which may advantageously be constituted by a container ( 1 ).

1 . Arrangement in a fire water system, especially for an offshore platform ( 20 ), wherein the system includes one or more fire water pumps ( 6 ) connected through a pipe system ( 2 - 5 ) to a number of deluge valves ( 12 ) coupled to associate pipe stretches ( 23 ) leading to respective fire sections ( 22 ), characterised in that it comprises a distribution manifold ( 2 ) having an upstream side ( 3 ) which is in open connection with fire water pumps ( 6 ) and with a buffer tank ( 7 ) for water, and having a downstream side ( 4 ) connected to the deluge valves ( 12 ) which are coupled to said pipes stretches ( 23 ), and that there is also provided a gas supply means ( 10 ) connected to the buffer tank ( 7 ) and having a pressure which is sufficient to see to it that the water pressure at the upstream side of the distribution manifold does not sink below a predetermined level after activation of the deluge valves ( 12 ), said distribution manifold ( 2 ) and the deluge valves ( 12 ), preferably also the buffer tank ( 7 ) and the gas supply means ( 10 ), being arranged as an integrated unit within a delimited area.  
     
     
         2 . Arrangement according to  claim 1 , characterised in that the distribution manifold ( 2 ) and the deluge valves ( 12 ) are mounted within a container ( 1 ) constituting the delimited area, the deluge valves ( 12 ) being coupled to respective outlets ( 14 ) from the container ( 1 ) to said pipe stretches ( 23 ).  
     
     
         3 . Arrangement according to  claim 2 , characterised in that also the buffer tank ( 7 ) and the gas supply means ( 10 ) are installed in the container ( 1 ).  
     
     
         4 . Arrangement according to  claim 2  or  3 , characterised in that also the fire water pumps ( 6 ) are installed in the container ( 1 ).  
     
     
         5 . Arrangement according to  claim 3  or  4 , characterised in that the buffer tank ( 7 ) comprises a number of tubular containers.  
     
     
         6 . Arrangement according to one of the claims  2 - 5 , characterised in that the container ( 1 ) is heated.  
     
     
         7 . Arrangement according to one of the claims  2 - 6 , characterised in that the container ( 1 ) is fire insulated.