606.5.7 Tank drain pipes.
PC § 606.5.7
A valved pipe shall be provided at the lowest point of each tank or tank compartment to permit emptying of the tank. The tank drain pipe shall discharge as required for overflow pipes and shall not be smaller in size than specified in Table 606.5.7. Table 606.5.7Size of Drain Pipes for Water Tanks Tank Capacity(gallons)Drain Pipe(inches)Up to 7501751 to 1,5001 1/21,501 to 3,00023,001 to 5,0002 1/25,000 to 7,5003Over 7,5004 For SI: 1 inch = 25.4 mm, 1 gallon = 3.785 L.
