Quick Reference-Fire Fighting (Part-4)

QUICK REFERENCE-FIRE FIGHTING (PART-4)

November 16, 2023 Leave a comment

Suction and Delivery Pipes of Pumps Fire Pump (CPWD)

Pump Capacity Suction (Minimum) Delivery (Minimum) 450 LPM 50 mm 50 mm 900 LPM 70 mm 50 mm 1400 LPM 100 mm 100 mm 2280 LPM 150 mm 150 mm 2850 LPM 200 mm 150 mm 4540 LPM 250 mm 200 mm

SELECTION OF ORIFICE PLATE (CPWD)

Pressure Loss Kg/cm2 Diameter of Orifice (mm) 80 MM PIPE 100 MM PIPE 3.5 41.9 3 43 2.5 44.8 2 46.4 1.5 48.9 56.2 1 52.3 57.6 0.9 53.2 59 0.8 54.1 60.4 0.7 55.3 62 0.6 56.6 63.9 0.5 58.2 66.5 0.4 59.8 69.7 0.3 62 74.2 0.2 65 81.1 0.1 82.2

FLANGE THICKNESS (CPWD)

Pipe diameter Flange Thickness 200 mm 24 mm 150 mm and 125 mm 22 mm 100 mm and 80 mm 20 mm 65 mm 18 mm 40 mm and below 16 mm Gasket thickness shall not be less than 3 mm. Mild steel flanges shall be in accordance with Table:17 of IS : 6392

Sprinkler Spacing, Arrangement, Distribution and Locations (CPWD)

(i) Maximum Area Coverage per Sprinkler (a) Ceiling sprinkler 12 m2 (b) Side wall sprinkler : Combustible ceiling 7.5 m2 Non-Combustible ceiling 9 m2 (ii) Maximum Distance between Sprinklers (a) Ceiling sprinkler 3.5 Meter (b) Side wall sprinkler (i) Combustible ceiling 2.7 Meter (ii) Non-combustible ceiling 3 Meter (iii) Minimum Distance between Sprinklers (for Ceiling as well as Sidewall sprinklers) 1.8 Meter Note: In case of intermediate ceiling suspended sprinklers, protecting commodities in racks, distance lower than 1.8 Meter may be considered if necessary. Maximum distance of sprinklers from end walls : it shall not exceed half of the allowable distance between sprinklers Note: For ceiling sprinklers: a) where the external walls are combustible or built with metallic or otherwise or open sided; and in case of open joisted ceilings or where the roof has the rafters exposed, the distance between the boundary and the sprinklers shall not exceed 1.5 Meter. b) Distance shall be measured perpendicular to the wall. Sprinklers shall not be located at a distance less than 100 mm from the wall (for ceiling sprinklers). Sprinklers shall not be located at a distance less than 100 mm from the end wall (for sidewall sprinklers)

Table 9.7 Guidelines for stocking spare sprinkler (CPWD)

HAZARD CLASS All state capitals and within 200 Km Other locations Light 5 sprinklers of each type 15 Moderate/Ordinary 15 sprinklers of each type 25 High & storage 30 sprinklers of each type 50

Sidewall Sprinkler Location in Relation to Obstructions (lighting, fan and similar fixtures) -Facing across the wall ( CPWD-Table 9.2)

Distance (A) between Sprinklers and the Obstruction on Side (mm) Maximum allowable Distance (B) between Deflector above bottom of Obstruction when Sprinkler can be allowed Up to 1200 Not allowed More than 1200 but less than 1500 25 More than 1500 but less than 1650 50 More than 1650 but less than 1800 80 More than 1800 but less than 1950 100 More than 1950 but less than 2100 150 More than 2100 but less than 2250 180 More than 2250 but less than 2400 230 More than 2400 but less than 2550 280 More than 2550 350

Sidewall Sprinkler Location in Relation to Obstructions (lighting, fan and similar fixtures)-Along the same wall (CPWD-Table 9.3 )

Distance (A) Between Sprinklers and the Obstruction on Side (mm) Maximum allowable Distance (B) between Deflector above bottom of Obstruction when Sprinkler can be allowed 100 to 150 25 More than 150 but less than 300 50 More than 300 but less than 450 80 More than 450 but less than 600 115 More than 600 but less than 750 150 More than 750 but less than 900 180 More than 900 but less than 1050 200 More than 1050 but less than 1200 230 More than 1200 but less than 1350 250 More than 1350 but less than 1500 300 More than 1500 but less than 1650 330 More than 1650 but less than 1800 350 More than 1800 but less than 1950 380 More than 1950 but less than 2100 430 More than 2100 but less than 2250 450

Sprinkler Location Below Ceilings [Clause 9.4.7.1],Table 9.1 (CPWD)

Type of ceiling Distance below ceilings (in mm) MIN MAX PREFERRED Combustible, asbestos cement sheets, wired glass and frangible 75 300 150 Combustible with exposed rafters and/or open joists 75 150 Non-combustible – either plane or arched or sloping 75 450 300

No of Sprinkler (NFPA-13)

PIPE SIZE Light hazard (Table 14.5.2.2.1) Ordinary Hazard (Table 14.5.3.4) Extra Hazard STEEL COPPER STEEL COPPER STEEL 25MM 2 Nos 2 Nos 2 Nos 2 Nos 1 Nos 32MM 3 Nos 3 Nos 3 Nos 3 Nos 2 Nos 40MM 5 Nos 5 Nos 5 Nos 5 Nos 5 Nos 50MM 10 Nos 12 Nos 10 Nos 12 Nos 8 Nos 65MM 30 Nos 40 Nos 20 Nos 25 Nos 15 Nos 80MM 60 Nos 65 Nos 40 Nos 45 Nos 27 Nos 85MM 100 Nos 115 Nos 65 Nos 75 Nos 40 Nos 100MM >100 Nos Check System Protection Area & Use Ordinary Haz…