An underground metro station needs a highperformance
outdoor fire hydrant system. As a result, the Technical Code for Fire Protection
Water Supply and Hydrant Systems (hereinafter referred to as the
specification) is thoroughly examined. A new classification method for outdoor
fire hydrants, water supply types, and rescue types is proposed. Some new
understandings about the firefighting and rescue requirements in the
specification are put forward as follows: (1) the design flow of an outdoor
fire hydrant should be guaranteed; (2) the design flow of an outdoor fire hydrant
should be supplied to the fire site on time; and (3) the conditions for
firefighters should be provided. The antecedents and consequences of the
building′s firewater volume, water composition, and
function are analyzed. On this basis, a new understanding of the design water
volume of an outdoor fire hydrant in an underground station has advanced, that
is, it should be determined in principle following the specification, but can
be reduced to at least 20 L/s for a single water source underground stations with particularly difficult
conditions. Meanwhile, to meet the firefighting and rescue requirements, new
requirements have been put forward for the design innovation of various
firefighting facilities, including: (1) For single water source underground stations
that cannot be equipped with outdoor firefighting water tanks, the firefighting
water tanks should be designed according to the standards for outdoor
firefighting water tanks. (2) For underground stations with a single water
supply, the two water pump adapters must be designed within 15~40 m of the fire tank, and the parking
and operation space of fire engines must be considered. The number of water
pump adapters should be strictly controlled. Meanwhile, the waterpump adapter and necessary outdoor fire hydrants for the water
supply should be installed. Outdoor fire hydrants and outdoor fire tanks
serving the same function should not be shared across the main road. Similarly,
water pump adapters and corresponding outdoor fire hydrants or fire tanks for
water supply should not be designed across the main road. (3) It is recommended
to set rescue outdoor fire hydrants within 5~40 m of each entrance and exit.