Scenario 1: The flow test performed indicated the available water supply was approximately 1620 gpm at a residual pressure 20 psi with a static pressure of 80 psi. Our sprinkler system design criteria are based on a NFPA 13 occupancy hazard classification of Ordinary Hazard Group 2. The design density is 0.20 gpm/sf over a design area of 1,500 square feet with a hose stream allowance of 250 gpm. The hydraulic calculation indicated a sprinkler demand of 360 gpm at a residual pressure of 50 psi at the base of the sprinkler riser, Point 1 on Figure 1. Adding the 250 gpm hose stream allowance to the sprinkler flow at the same pressure results in a total demand of 610 gpm at 50 psi. This is shown as Point 2 on Figure 1. Is the water supply adequate to support the sprinkler demand? Before we make that evaluation, the sprinkler calculation must be completed.
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