Hi: I am trying to find if a 4" main is adequate for a dry system to serve a parking garage. Here is what I am calculating. Would appreciate any feedback:
The area of application would be 1500 SF, which needs to increase by 30% as per Section 11.2.3.2.5, to 1950 SF. Water demand = 1950 x .15 = 293 GPM Add 250 hose allowance: 293 + 250=543 GPM Velocity at 4" main and 543 GPM =13.7 FPS, therefore ok Thank you Ramez
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