(a) Suction outlets for pools, spas and similar installations shall: - (i) Be designed to protect against entrapment, hair entrapment or entanglement hazard;
- (ii) Not constitute a hazard to the user; and
- (iii) Protect against evisceration.
(b) Suction outlets other than skimmer throats shall: - (i) Be provided with anti-vortex covers, or grates that have been tested by a nationally recognized testing laboratory and comply with ASME/ANSI A.112.19.8M R96, Suction Fitting for Use in Swimming Pools, Wading Pools, Spas, Hot Tubs, and Whirlpool Bathtub Appliances.
- (A) The installation of the anti-vortex covers or grates shall be according to manufacturer's specifications; and
- (B) A minimum of two (2) hydraulically balanced suction outlets (suction fittings) with anti-vortex covers or grates shall be provided per pool or spa pump suction line.
- (I) Multiple sets of pump suctions shall be permitted into two (2) or more suction outlets as long as they are hydraulically balanced and meet the requirements of these Regulations.
- (II) The distance between the suction fittings shall be three (3) to five (5) feet for suction outlets less than twelve (12) inches by twelve (12) inches and/or one-hundred forty-four (144) square inches.
- (III) All suction outlets larger than twelve (12) inches by twelve (12) inches and/or one-hundred forty-four (144) square inches on any pool or spa shall have a minimum of two (2) hydraulically balanced suction outlets (main drains) with a separation distance of three (3) feet or more in the lowest point of the pool or spa floor.
- (IV) The spacing of the suction outlets (main drains) shall not be:
- (1.) Greater than twenty (20) feet on centers; or
- (2.) More than fifteen (15) feet from each side wall.
- (V) No means of isolating suction outlets is permitted which could allow one (1) suction outlet to serve as the sole source of water to a pump.
- (VI) A single pipe to sump suction outlet that serves two (2) or more suction outlets may be valved to shut off the flow to the pump.
(c) Water velocity through suction outlet grates shall not: - (i) Exceed one and one half (1½) feet per second.
(d) Water velocity through anti-vortex suction outlet covers shall not: - (i) Exceed six (6) feet per second.
- (A) Suction outlets with velocities exceeding one and one half (1½) feet per second are permitted, provided each suction outlet has a cover that has been tested and approved for such velocities by a nationally recognized testing laboratory and complies with ASME/ANSI A.112.19.8M R96, Suction Fitting for Use in Swimming Pools, Wading Pools, Spas, Hot Tubs, and Whirlpool Bathtub Appliances.
- (B) The maximum velocity in the pump suction hydraulic system shall not exceed six (6) feet per second when one-hundred (100) percent of the pump flow comes from the main drain system.
- (C) The flow through the open area of the remaining suction grate outlet or outlets shall not exceed one and one half (1½) feet per second and shall meet ASME/ANSI A.112.19.8M R96, Suction Fitting for Use in Swimming Pools, Wading Pools, Spas, Hot Tubs, and Whirlpool Bathtub Appliances.
010-4 Wyo. Code R. § 4-17