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The hydraulically remote area is not always a perfect square, and in non-gridded and non-looped systems, it is configured quite easily. Assume that the remote area is calculated to contain 21 sprinklers... it is impossible to have a square remote area with that number of sprinklers.
A short note on remote area determination...
To calculate the number of sprinklers, simply divide the hydraulic design area by the spacing of the sprinklers in the system. In other words, in the last example, the remote design area was 3,000 sq. ft., and each sprinkler was spaced to cover 120 sq. ft. per sprinkler. 3,000 sq. ft. divided by 120 sq. ft. per sprinkler = 24 sprinklers.
This example works out to a whole number, but this isn't always the case. For example, if the remote area was 1,500 sq. ft., and the spacing per head was 120 sq. ft., then the remote area would contain 12.5 sprinklers. This means that 13 sprinklers are calculated, as the number is always rounded up.
© Hughes Associates,Inc. 2012