In new construction how do we field confirm a main drain plumbing in parallel per APSP/ANSI Entrapment 7 standards applied?lets say 75 gpm design flow and 20% ( or 15gpm ) is to flow through a 2" schedule 40 pvc pipe 30 feet from the equipment pad installed at deck level for the main drains. The drains are plumbed in parallel ( entrapment 7 ) 4'ft apart in 2.5" schedule 40 pvc pipe.ie: If a vacuum gauge is installed and running at 4hg and you mat test the second main drain what is the acceptable draw and time the gauge can increase from 4hg?

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