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606.5.4.2 Drain Pipes for Emptying Tanks
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Each tank or tank compartment shall be provided, at its lowest point, with a valved pipe to permit emptying the tank. The drain pipe shall discharge as required for the overflow pipe, and shall be at least 4 inches (102 mm) in diameter.
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NYC Plumbing Code 2014 > 6 Water Supply and Distribution > 606 Installation of the Building Water Distribution System > 606.5 Water Pressure Booster Systems > 606.5.4 Overflows > 606.5.4.2 Drain Pipes for Emptying Tanks
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Reference Standard 16 Plumbing and Gas Piping [PDF] (page 33)
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