Quick Reference-Fire Fighting (Part-2)

QUICK REFERENCE-FIRE FIGHTING (PART-2)

Size of the Mains for Fire Fighting as per Type of Building ( IS 3844 )

Mains of Fire Fighting Type of Building Building Height 100 mm single outlet landing valves I) Residential buildings (A) a) Lodging housing 15 Meter to 45 Meter b) Dormitory 15 Meter to 45 Meter c) Family private dwellings 15 Meter to 45 Meter d) Apartment houses 15 Meter to 45 Meter e) With shopping area not exceeding 250 m2 15 Meter to 45 Meter f) Hotel buildings up to 3 star grade 15 Meter to 24 Meter and area not exceeding 600 m2 per floor 100 mm single outlet landing valves II) Educational buildings (B) Above 15 m but not exceeding 35 m 101 mm single outlet landing valves III) Institutional buildings (C) Above 15 m but not exceeding 35 m 100 mm single outlet landing valves a) For hospitals and sanatorium with beds not exceeding 100no’s Above 15 m but not exceeding 25 m 100 mm single outlet landing valves b) For custodial places and mental institutions Above 15 m but not exceeding 35 m 100 mm single outlet landing valves IV) Assembly buildings (D) Above 15 m but not exceeding 24 m and total floor area not exceeding 500 m2/floor 100 mm single outlet landing valves V) Business buildings (E) Above I5 m but not exceeding 24m 100 mm single outlet landing valves VI) Mercantile buildings (F) Above 15m but not exceeding 24 m 100 mm single outlet landing valves VII) Industrial buildings (G) Above 15 m but not exceeding 24 m 150mm with twin outlet landing VIII) All buildings classified under(I) To (IV) Above 45 m 150mm with twin outlet landing IX) All buildings classified under( v) above with shopping area not exceeding 250 m2 Above 24 m 150mm with twin outlet landing X) All buildings classified under (vi) above Above 24 m and area exceeding 600 m2 150mm with twin outlet landing XI) Hotel buildings of 4 star and 5 star grade Above 15 m 150mm with twin outlet landing XII) All buildings classified under II and III above Above 25 m/35 m as applicable 150mm with twin outlet landing XIII) All buildings classified under IV above Above 25 m and area exceeding 500m2/floor 150mm with twin outlet landing XIV) All buildings classified under V above Above 24 m 150mm with twin outlet landing XV) All buildings classified under VI above Above 24 m but not exceeding 35 m 150mm with twin outlet landing XVI) All buildings classified under VII above Above 24 m but not exceeding 35 m 150mm with twin outlet landing XVII) All storage buildings (H) Above 10 m but not exceeding 24 m

As per (IS 3844)

Type of Riser Internal hydrants form part of any of the following systems a) Dry-riser system, b) Wet-riser system, c) Wet-riser-cum-down-comer system d) Down-comer system. Dry-Riser System ( for Cold Region ) Dry-riser main system can be installed in buildings under Group A (iI, ii, ii, iv ), where the height of building is above 15 m but not exceeding 24 m up to terrace level and where the water supply for firefighting is immediately available either through the underground water storage tank/tanks or through water mains/town’s main Dry-riser system does not include hose reel, hose cabinets, fire hose and branch pipes. Wet-Riser System Wet-riser system should be provided in the types of buildings according to the provision mentioned. The system should consist of a pipe or number of pipes depending on the area and height of the buildings permanently charged with water under pressure with landing valves, hose reel, hose, branch pipe, etc, at every floor level A provision of pressure differential switch to start the pump automatically, so that water under pressure is advisable for operational hydrant, hose reels, etc, as soon as the water is drawn from hydrant landing valves causing drop in pressure. The system also incorporates a stand-by pump to come into operation automatically when the normal power supply source fails. The distribution of wet-riser installation in the building should be so situated as not to be farther than 30 m from any point in the area covered by the hydrant and at a height of 0.75 m to 1 m from the floor. The rising mains should not be more than 50 m apart in horizontal. Fire service inlet with gate and non-return valve to charge the riser in the event of failure of the static pump directly from the mobile pump of the tie services should: be provided on the wet-riser system. The, fire service inlet for 100 mm internal diameter rising main should have collecting head with 2 numbers of 63 mm inlets and for 150 mm rising main, collecting head with 4 numbers of 63 mm inlets should be provided. For wet-risers down-comer system, two pumps of different capacities one for the wet-riser and the other for down-comer system should be installed. The pumps should be fed from normal source of power supply and also by an alternative source in case of failure of normal source. For a wet-riser system, two automatic pumps s…