Quick Reference-Fire Fighting (Part-5)

QUICK REFERENCE-FIRE FIGHTING (PART-5)

December 11, 2023 Leave a comment

Fire Pipe Support

Hanger rod diameter (mm) Nominal Pipes Diameter (mm) Spacing between supports (meter) Up to 25MM 8MM 2MM 32 to 50MM 8MM 2.5MM 65 to 80MM 10MM 2.5MM 100MM 12MM 2.5MM 150MM 16MM 3MM 200MM & above 16MM 3MM Extra supports shall be provided at the bends and at heavy fittings like valves to avoid undue stress on the pipes.

Support Spacing for Steel Pipe (ASME B31.1)

Pipe Size Water Gas 25.4 MM 2133.6 MM 2743.2 MM 50.8 MM 3048 MM 3962.4 MM 76.2 MM 3657.6 MM 4572 MM 101.6 MM 4267.2 MM 5181.6 MM 152.4 MM 5181.6 MM 6400.8 MM 203.2 MM 5791.2 MM 7315.2 MM 304.8 MM 7010.4 MM 9144 MM 406.4 MM 8229.6 MM 10668 MM 508 MM 9144 MM 11887.2 MM 609.6 MM 9753.6 MM 12801.6 MM

Thumb Rules for Pipe Support Spacing

As a rule of thumb, the spacing of pipe supports for steel pipes in liquid service, expressed in feet, may be taken as the nominal pipe size, expressed in inches, plus ten. For example, the spacing of pipe supports on a 6″ line will be approximately 6 + 10 = 16 feet

The Minimum Rate of Flow (NBC-2016) (Table 6.10.2.1.3)

Nominal Pipe Size Flow Rate Flow Rate 50 MM 100 gpm 380 L/Min 65 MM 150 gpm 568 L/Min 75 MM 220 gpm 833 L/Min 100 MM 390 gpm 1500 L/Min 125 MM 610 gpm 2300 L/Min 150 MM 880 gpm 3350 L/Min 200 MM 1560 gpm 5900 L/Min 250 MM 2440 gpm 9250 L/Min 300 MM 3520 gpm 13300 L/Min

Size of Mains (NBC-2016) Table 8

Size of the Mains Type of Building Remarks 100 mm with single outlet landing valves (a) Residential building (A): – 1) Dormitories – 2) Apartments – 3) Hotels Up to 45 m height (b) Educational buildings (B) – (c) Institutional buildings (C) Up to 30 m height (d) Assembly buildings (D) – (e) Business buildings (E) Up to 45 m height (f) Mercantile buildings (F) – (g) Industrial buildings (G) Up to 15 m heigh 150 mm with single outlet landing valves a) Hotels Above 45 m height b) Starred hotels c) Institutional buildings (C) Above 30 m height d) Business buildings (E) Above 45 m height e) Industrial buildings (G) Above 15 m height f) Storage buildings (H) Up to 15 m height g) Hazardous buildings (J) Up to 15 m height

Concealed Spaces Fire Protection (CPWD)

9.4.9.1 If the height of the concealed space at roof and floor is not greater than 0.8meter, the spaces shall be sprinkler protected only if they contain combustible materials or are constructed with combustible materials. Electrical cables with voltage less than 250 V, single phase, with a maximum of 15 cables per tray, are allowed. 9.4.9.2 Spaces between roofs and ceiling more than 0.8 m deep shall be sprinkler protected as follows: (i) Concealed spaces less than 5m2 in area shall not require sprinkler protection. (ii) Sprinkler heads shall be provided considering the space as any other area in the building. (iii) Sprinkler heads may be connected individually with the range/distribution pipes below, which shall be sized by taking the room and concealed space sprinklers cumulatively. (iv) Sprinkler heads for concealed space and for the room may be connected with separate range / distribution pipes connected, with common feed pipe. The common feed pipes shall be not less than 65 mm diameter.

Fire Fighting Accessories (CPWD)

Yard Hydrant (External Hydrant) Yard hydrants a ring of pipe shall be laid underground around the building at a minimum distance of 2 Meter but not more than 15 Meter from the building face. All internal risers shall be connected with this ring. The yard hydrants shall be easily accessible and should normally be provided near boundary wall/along road At least one External Hydrant post shall be provided for every 45 Meter All Yard hydrant outlets shall be situated 1 Meter above ground level. The stand posts shall be 80 mm in diameter for single headed hydrants. Underground pipe shall be laid at least 2m away from the face of the building preferably along the roads and foot paths. As far as possible laying of pipes under road, pavement and large open spaces shall be avoided. Pipes shall not be laid under buildings and where unavoidable, these shall be laid in masonry trenches with removable covers and cut-off valves shall be provided at points of entry and exit. Fire Service Inlet In order to facilitate feeding of water in the system by fire service, a 2 or 3 Way 63 mm diameter collecting head shall be provided and connected with each riser/down comer and the ring main with non-return valve and butterfly/sluice valve. This should be located at a place where fire brigade tender can reach. Fire Service connection It is for feeding water to underground storage tank by fire tenders. The static water storage tank shall be provided with a fire brigade collecting head with 4 number 63 mm diameter instantaneous male inlets arranged in a valve box at a suitable point at street level. Fire Brigade draw out collecting head Each of the static water sto…