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

Hydraulic Calculations

Sprinkler Coverage

How it's calculated...

The area that a sprinkler covers seems like a relatively simple thing, and it should be.  Simply put, the area that a sprinkler covers is calculated by multiplying the distance between branch lines by the distance between sprinklers on the branch line.

Let's assume that a building sprinkler system is installed with sprinklers spaced ten (10) feet apart along the branch lines and with branch lines spaced ten (10) feet apart.  That is a sprinkler spacing of 100 square feet per sprinkler, which is acceptable in many occupancies.  Keep in mind that the actual coverage of a sprinkler head is only half the distance between each sprinkler and branch line.  This means the spaces along the walls and in the corners of the building can't exceed half the allowable spacingIn the case of this example, the sprinklers have to be no more than six feet off of the wall, and the piping has to be no more than five feet off the wall..  In some instances, contractors, in an effort to make a sprinkler system "fit", will not adhere to the half-spacing along walls and into corners.  Thus, when the math is done, the spacing Spacing verification is a necessity if reviewing a plan. Start at the corners, and move along the walls before going to different spots in the middle of the floor on the plan. may be greater than what is allowed for the particular hazard or sprinkler type.

System spacing example

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

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