(4) Except as provided in Sentence (6), every circulation system in a public spa shall be served by a minimum of two suction or gravity outlets, (a) that are interconnected to a full size manifold, and (b) except as provided in Sentence (5), that are separated by a clear distance of not less than 900 mm. (5) If compliance with Clause (4)(b) is impracticable because of dimensional restrictions at the bottom of the public spa , the outlets may be located on two different planes of the public spa if, (a) at least one of the outlets through which the public spa can be emptied to a full-size manifold is located on the bottom of the public spa , and (b) the bottom of all outlets, other than skimmers, are not more than 75 mm from the floor of the public spa . (6) A circulation system in a factory-built public spa may be served by a built-in suction or gravity outlet with multiple openings that are connected to a full-size manifold. (7) All fittings at or below the water surface that allow water or air or both to be passed to or from the public spa shall be securely held in place by corrosion resistant fastening that requires a tool for removal and is galvanically compatible with the fittings and grilles or covers. (8) Except as provided in Sentence (9), all suction or gravity fittings installed at or below the water line of a public spa shall, (a) have a maximum opening of 7 mm in one direction, and (b) be designed so that the flow of water through the openings does not exceed 0.45 m/s. (9) Sentence (8) does not apply to suction and gravity outlets that are equipped with anti-entrapment covers that comply with the requirements of ASME A112.19.8, “Suction Fittings for Use in Swimming Pools, Wading Pools, Spas, and Hot Tubs”. (10) The calculation of water velocities for the purposes of Clause (8)(b) and Sentences (11) and (12) and the calculation of water flow rates for the purposes of Sentence (9) shall be based on the assumption that all possible sources of suction flow are present at the same time. (11) The water velocity in a suction pipe shall not exceed 1.8 m/s. (12) The water velocity in a pressure pipe shall not exceed, (a) 3.0 m/s for plastic piping, and (b) 1.8 m/s for copper piping. 233
(13) Every suction system that serves a public spa shall be equipped with a vacuum relief mechanism that shall include, (a) a vacuum release system, (b) a vacuum limit system, or (c) other engineered systems that are designed, constructed and installed to conform to good engineering practice appropriate to the circumstances. (14) Equipment shall be installed to continuously disinfect the water in a public spa by means of a chlorination, hypochlorination or bromination system that is capable of regulating the dosage of chlorine or bromine. (15) If a two-speed pump is utilized for a public spa , the filter and heater shall be sized to accommodate the maximum pump output, without exceeding the manufacturer’s design flow rate of the filter element or heater and without by-passing the filter element.
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- Fall '16
- Drinking water, Water supply network, Division B