We have a fire pump room which is very constrained.
NFPA 20 (Edition 2016), A.22.214.171.124 (2) For horizontal split-case fire pumps, there should be a distance of not less than 10 diameters of suction pipe for side connection (not recommended) to the fire pump suction flange.
The main pumps have a capacity of 3000 gpm (two are electrically-driven and two are diesel-driven) with two jockey pumps at 300 gpm capacity. All are in one room. Pumps suction and discharge pipe size is 12" as per Table 4.27 (a).
In this scenario, what is the meaning of 10 diameters - is it 10 times of suction size diameter of pump (means 10x12= 120") or something else?
Why is this requirement only limited to suction and why not for discharge side as there is tapping for pressure monitoring? Any thought would be much appreciated.
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