SC Swimming Pool Practice Questions - South Carolina Swimming Pool Contractor Examination Exam

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R.61-51.C.29 requires a minimum of two main drains, interconnected, with spacing that is not greater than 20 feet nor less than 3 feet on center, and not more than 15 feet from any side wall. What additional hydraulic rule applies to each outlet grate?

Each grate may be sized for 10 percent of the recirculation flow Each grate must be sized for 100 percent of the recirculation flow, and velocity through the open area must not exceed 1-1/2 feet per second (6 feet per second if anti-vortex fittings are used) Grates may be removable without tools A single drain is acceptable if it has a hydrostatic relief valve

Correct Answer:

Each grate must be sized for 100 percent of the recirculation flow, and velocity through the open area must not exceed 1-1/2 feet per second (6 feet per second if anti-vortex fittings are used)

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