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NOTE: This is an unformatted excerpt from our online fire protection training library.

Hydraulic Calculations

Special Design Approaches

Exposure Protection & Water Curtains

When exposure protection is applied to the outside of a building or structure, piping has to be calculated to provide a minimum 7 psi for each sprinkler that faces the exposure.  Exposure systems can be wet pipe, dry pipe or deluge systems.  And, they can be supplied from piping in the buildingIf exposure sprinkler systems are connected to the in-building sprinkler system, the building system hydraulic calculations must include flow and pressure for the exposure piping system(s). that is part of a building sprinkler system. 

A word about Exposure Protection...

Water curtains are similar to exposure systems, but have different applications. Sprinklers for water curtains are designed on the basis of flowing three (3) gpmEach sprinkler in the water curtain has to flow a minimum of 15 gpm, however. for each linear foot that they cover. Water curtains can use either open nozzles or sprinklers, or closed sprinklers. If the water curtain employs closed sprinklers, the number of sprinklers calculated is the number equivalent to one branch line in the longest side of the most remote area of the building's sprinkler system sprinkler hydraulic design area. These are also often used to protect windows in fire resistance rated wall assemblies.

As with exposure protection, if the water curtain is supplied from the building sprinkler system, the hydraulics for the water curtain are calculated within the design for the building's sprinkler system.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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