Requirements for installation of Fire Sprinkler

MEP Engineering March 06, 2019
Requirements for installation of Fire Sprinkler: From NFPA tables according to hazard We get four important notes which used in our design. Maximum spacing between two sprinkler,Minimum spacing between two sprinkler,Maximum spacing between sprinkler and wall,Minimum spacing between sprinkler and wall.

Requirements for installation of Fire Sprinklers

What is the requirements for installation of  Fire sprinkler ?

From NFPA tables according to hazard We get four important notes which used in our design: 
  • Maximum spacing between two sprinkler equal to (4.6 m).
  • Minimum spacing between two sprinkler equal to (1.8m)
  • Maximum spacing between sprinkler and wall equal to ( Half of the space between two sprinkler )=(4.6/2 = 2.3 m).
  • Minimum spacing between sprinkler and wall equal to 10..2 cm.for easy maintenance.

Protection areas per sprinkler and maximum spacing  (SSU/SSP)

Protection areas per sprinkler and maximum spacing (SSU/SSP)

Protection areas per sprinkler and maximum spacing  (SSU/SSP)


water sprinkler data & distribution

water sprinkler data & distribution

water sprinkler data & distribution

Area of sprinkler operation (ft^2) and Density(gpm/ft^2)

Area of sprinkler operation (ft^2) and Density(gpm/ft^2)
Area of sprinkler operation (ft^2) and Density(gpm/ft^2)

Sprinkler distribution light hazard .at density =.1 gpm/ft^2

  • Area of sprinklers operation =1500 ft^2
  • Protection area per sprinkler = 225 ft^2
  • Number of working sprinklers = 1500/225 = 6.666 = 7 sprinklers 
Sprinkler distribution ordinary hazard at density = .15 gpm/ft^2
  • Area of sprinklers operation =1500 ft^2 
  • Protection area per sprinkler =130ft^2
  • Number of working sprinklers=1500/130 =12 sprinklers 

Return bend

  • To prevent sediment buildup,return bends shall be installed in all shipboard sprinkler systems where pendent-type or dry pendent -Type sprinklers are used in wet systems.
  • Consideration shall be given concerning the intrusion of saltwater into the system.
  • Specifically, sprinklers shall not be rendered ineffective by corrosion related to saltwater entrapment within the return bend.

Pendent sprinkler
Pendent sprinkler

Pendent sprinkler installation

Pendent sprinkler installation
Pendent sprinkler installation


Required sprinkler working pressure


Required sprinkler working pressure
Required sprinkler working pressure

 Note:for SI units, gpm=3.785 L/min, 1psi=0.0689 bar .

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