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3. Except as provided in subd. 4., the velocity of flow through any inlet orifice shall be in the range of 5 to 20 feet per second
Note: See ch. SPS 390 Appendix for inlet velocity information.
4. For pools equipped with skimmers the velocity of flow through any inlet orifice shall be in the range of 10 to 20 feet per second.
5. Except for leisure rivers, the minimum number of return inlets shall be based on at least one additional inlet per 300 square feet of pool surface area or fraction thereof.
6. There shall be at least one wall return inlet for each 10 feet of stairway width, recessed bench length or swimout length or width or fraction thereof.
7. Bottom return inlets shall be flush with the basin floor.
8. Bottom return inlets shall be considered to have an area of influence of a radius of 10 feet.
Note: See ch. SPS 390 Appendix for further explanatory material.
9. Wall return inlets may not extend more than one inch into a basin.
10. Except for leisure rivers, there shall be a wall return inlet within 5 feet of each corner of a basin wall.
(c) Suction outlets.
1. Suction system flow through main drains shall be designed to accommodate 100 percent of the circulation flow rate in accordance with all of the following:
a. All basins shall be provided with a suction outlet in the lowest point of the basin in the floor or the wall.
Note: For main drains installed in diving wells, see Figure 390.11-1 and Table 390.11-1.
b. Where 2 or more drains connect within the circulation system, all drains minus any one in the set shall be designed to collectively convey 100 percent of the circulation flow rate.
c. The distance between the bottom of the suction outlet grate and the opening of the suction pipe shall equal or exceed at least 1.5 times the inside diameter of the suction pipe.
2. Suction outlet grates shall comply with at least one of the following requirements:
a. A single grate having at least one dimension of length, width, diagonal or diameter that is at least 36 inches.
b. Two or more grates of any size separated from other suction outlets by at least 3 feet.
3. Suction systems shall be designed so that the maximum flow rates are not exceeded under operating conditions.
4. Suction grates and covers shall be listed as conforming to ASME/ANSI A112.19.8.
5. The maximum opening of any suction grate shall prevent the passage of a ½-inch sphere.
6.
a. Barriers shall be provided on all wave pool caisson walls.
b. Openings in caisson barriers shall prevent the passage of a 4-inch sphere.
7. Vacuum fittings are not permitted within public swimming pools or water attractions.
(d) Surface skimming systems.
1. Surface skimming systems shall be included in the design of and installed to serve all basins.
2. Surface skimming systems shall be designed and constructed to skim the basin surface when the water level is maintained within the operational parameters of the system’s rim or weir device.
3. Skimmers shall be located so as to maintain effective skimming action.
4. Skimmer covers located on a walking surface shall be designed and installed to comply with all of the following requirements:
a. The skimmer cover shall be appropriately seated.
b. The skimmer cover shall be slip resistant.
c. The skimmer cover shall be sufficiently strong so as to withstand normal use.
d. The skimmer cover may not create a tripping hazard.
5. Equalizer lines shall have an anti-entrapment cover or other entrapment protection in accordance with ASME/ANSI A112.19 when suction fittings are located in the wall of a basin.
6. Where automatic skimming devices are used as the sole overflow system, at least one surface skimming device shall be provided for each 500 square feet or fraction thereof of water surface area.
7. Circulation systems shall be designed to carry 100 percent of the rated circulation volume through the skimmers.
8. The flow rate through automatic skimmers shall be no less than 3 gallons per minute per inch of skimmer weir width.
Note: The maximum flow rate through skimmers is determined by the ANSI/NSF 50 rating.
9. Acceptable options for surface skimming systems shall be in accordance with Table 390.14-3.
Table 390.14-3
Acceptable Surface Skimming Systems
- See PDF for table PDF
10. When a gutter skimming system is used, the system shall be connected to a circulation system with an adequate surge capacity to permit all phases of operation.
11.
a. Except as provided in subd. 11. b., a zero-depth trench shall extend continuously from within 3 feet of one wall of the basin to within 3 feet of the opposite wall of the basin.
b. Where the entire perimeter of the basin consists of a zero-depth entry, 50 percent shall be evenly-distributed zero-depth trench.
History: CR 08-056: cr. Register February 2009 No. 638, eff. 3-1-09; correction in (10) (a) made under s. 13.92 (4) (b) 7., Stats., Register February 2009 No. 638; correction in (1), (11) (a) 2., (13) (d) 9. made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672; correction in (10) (a) made under s. 13.92 (4) (b) 7., Stats., Register February 2017 No. 734.
SPS 390.16 Mechanical systems.
(1) Electrical. Electrical components shall comply with the requirements of ch. SPS 316.
(2) Water heaters.
(a) Water heating equipment shall comply with chs. SPS 364 and 365.
(b) A thermometer accurate to within plus or minus 2°F of the operating range shall be installed in the circulation piping.
(c) The thermometer required in par. (b) shall be accessible for reading.
(d) The use of a toxic solution, such as, but not limited to, heat transfer fluid in a single-wall heat exchanger, is prohibited.
(e) Water heaters and hot water storage tanks shall be equipped with temperature and pressure relief valves in accordance with ch. SPS 384.
(3) Illumination.
(a) Artificial lighting shall be provided so that all areas of the pool, including the bottom, shall be visible when the pool or water attraction is used during periods of low illumination.
(b) For outdoor facilities, overhead lighting shall provide a minimum of 3 footcandles of illumination at the water surface and on the deck.
(c) For indoor facilities, overhead lighting shall provide a minimum of 10 footcandles at the water surface and on the deck.
(d)
1. Except as permitted in subd. 2., underwater lighting shall provide a minimum of ½-watt incandescent light per square foot of water surface area or equivalent.
2. If overhead lighting provides a minimum of 15 footcandles illumination at the water surface, no underwater lighting is required.
(e) For exterior facilities, areas that are designed to operate during periods of low illumination shall be provided with sufficient emergency lighting to permit evacuation of the facility.
(f) For exterior facilities, emergency lighting shall activate within 10 seconds of lighting failure.
(4) Water supply.
(a) Water quality. The water supply for all public swimming pools and water attractions shall meet the water quality requirements as listed in ch. SPS 382, Table 382.70-1.
Note: Refer to Appendix A-390.16 (4) for s. SPS 382.70 Table 382.70-1.
(b) Cross connection control. Protection of the potable water supply shall comply with s. SPS 382.41.
(c) Makeup water quality. Makeup water to maintain the water level in all public swimming pools and water attractions and water used as a vehicle for disinfectants or other pool chemicals, for pump priming or for other such additions, shall meet the requirements listed in ch. SPS 382, Table 382.70-1.
Note: Refer to Appendix A-390.16 (4) for s. SPS 382.70 Table 382.70-1.
(d) Spray feature water. Water used for spray features or water falling onto patrons shall be disinfected if supplied from a whirlpool or wading pool basin.
(5) Wastewater disposal. Wastewater discharges shall be in accordance with ss. SPS 382.38 Table 382.38-1 and 382.33.
Note: See ch. SPS 390 Appendix for a reprint of Table 382.38-1.
(6) Equipment room.
(a) An equipment room or equipment enclosure shall be provided to serve all public swimming pools and water attractions.
1. An equipment room shall be ventilated in accordance with ch. SPS 364.
2. An equipment room shall be drained.
3. An equipment room shall be accessible for operation and maintenance of equipment.
(b) The doors to all rooms in which a chlorine gas feeder is located or a cylinder of compressed chlorine gas is located or stored shall be labeled “DANGER-CHLORINE GAS” in clearly readable letters.
History: CR 08-056: cr. Register February 2009 No. 638, eff. 3-1-09; correction in (1), (2) (a), (e), (4) (a), (b), (c), (5), (6) (a) 1. made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 390.17 Sanitizing equipment.
(1) Equipment standards.
(a) Sanitizing equipment shall be certified to comply with the requirements of NSF/ANSI 50.
(b) A chemical system that provides the residual required by ch. ATCP 76 shall be installed when an alternative means of disinfection is proposed.
Note: Alternative disinfection systems include ultraviolet light, ozone and electrolytic chlorine generation, but are not limited to those systems.
(c) Sanitizing equipment shall be capable of introducing a sufficient quantity of a U.S. EPA-approved sanitizer for normal operating procedures.
Note: See ch. ATCP 76 for disinfectant concentration and efficacy requirements.
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.