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Abstract

In a standpipe/wet riser system, landing valves are the terminating fixed components to which firefighters connect flexible hoses and nozzles. Traditionally, landing valves are simple isolating valves, but pressure-reducing valves are now available. A landing valve with an integrated fixed-ratio pressure-reducing devices has been used in Hong Kong. This Note examines the water pressure available at the landing valves in a proposed standpipe/wet riser installation in an example tall residential building in Hong Kong, under various operating conditions. Improvements to the relevant Hong Kong code of practice are recommended. The Note further details the locations in a building where pressure-reducing landing valves have been used inappropriately, and indicates issues to be addressed in their application.

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References

Hong Kong Fire Service Department Code of practice for minimum fire service installations and equipment (1994)

BS5041: Part 1: Specification for landing valves for wet risers (London: British Standards Institution ) (1987)

Cheung K.P. , Ching W.Y. , Lam W.H. and Fong K.M. A report on the hydraulic performance of fire fighting nozzle, flexible hose, fire hydrant, fire service inlet (Department of Mechanical Engineering, Hong Kong Polytechnic University) (1989)

Council on Tall Buildings and Urban Habtitat Fire safety in tall buildings Com. 8A pp 47-60 (New York: McGraw Hill) (1992)

Cheung K.P.

Boosting water from fire appliances to fire fighting systems in tall buildings

Proc. Fifth World Cong. Council on Tall Buildings and Urban Habitat pp775-789 (May 1995)

Landing valves with integrated fixed-ratio pressure reducing devices in tall buildings

Abstract

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References