SPS 390.14(1) (1)Turnover rate. Circulation system equipment shall be designed to produce a turnover rate as specified in Table 390.14-1 or Table 390.14-2.
SPS 390.14 Note Note: See ch. SPS 390 Appendix for further information.
Table 390.14-1
Maximum Turnover Ratesa - See PDF for table PDF
a Calculate an average turnover time for multi-sectional basins.
b For pool types not listed herein, contact the department.
c Based on flow and pressure drop with a clean filter condition.
d Or as otherwise approved by the department.
Table 390.14-2
Therapy/Exercise Turnover Times - See PDF for table PDF
N/A Not applicable
a The number of persons is equal to the posted patron load.
SPS 390.14 Note Note: A therapy area within a multi-section pool having a temperature of < 93 oF is considered to be an activity pool.
SPS 390.14(2) (2)Separate systems. The circulation system shall be separate for each public swimming pool or water attraction.
SPS 390.14(3) (3)Separation from slides and play features.
SPS 390.14(3)(a)(a) Except as provided in pars. (b) and (c), public swimming pool or water attraction circulation systems may not serve slide or spray features.
SPS 390.14(3)(b) (b) A maximum of 10 percent of the required circulation system rate may be provided for the lubrication of slides or to spray features.
SPS 390.14(3)(c) (c) Flow in excess of the required circulation rate may serve slides and spray features.
SPS 390.14(4) (4)Accessibility. Circulation system equipment, including but not limited to pumps, skimmers, filters, gauges, meters and thermometers, shall be readily accessible for inspection, repair or replacement.
SPS 390.14(5) (5)Component standards. Equipment that is within the scope of ANSI/NSF 50, circulation system components and related materials, shall be listed by an acceptable listing agency to meet ANSI/NSF 50 or equivalent.
SPS 390.14(6) (6)Installation.
SPS 390.14(6)(a)(a) Pool equipment and related piping shall be supported to prevent damage from misalignment and settling.
SPS 390.14(6)(b) (b) Pool equipment shall be installed in accordance with manufacturer's printed instructions and as specified in this chapter. If there is a conflict between the manufacturer's printed instructions and requirements of this chapter, the requirements of this chapter shall take precedence.
SPS 390.14(7) (7)Velocities and pipe sizing requirements.
SPS 390.14(7)(a)(a) Velocities in the circulation system may not exceed:
SPS 390.14(7)(a)1. 1. Ten feet per second in discharge piping other than copper.
SPS 390.14(7)(a)2. 2. Eight feet per second in copper discharge piping.
SPS 390.14(7)(a)3. 3. Six feet per second in suction piping.
SPS 390.14(7)(a)4. 4. One and one-half feet per second through suction grates.
SPS 390.14(7)(b) (b) Pool piping shall be sized to permit the rated flows for filtering and cleaning without exceeding the maximum design head of the pump.
SPS 390.14(8) (8)Gauges and flow meters.
SPS 390.14(8)(a)(a) A pump suction compound gauge shall be included in all circulation systems.
SPS 390.14(8)(b) (b) A pump discharge gauge shall be located upstream of all throttling valves.
SPS 390.14(8)(c) (c) A filter pressure gauge shall be included serving all filters in circulation systems.
SPS 390.14(8)(d) (d) A flow meter capable of displaying flow during filtration shall be included in all circulation systems.
SPS 390.14(9) (9)Testing. Circulation system piping that is installed onsite shall be subjected to an induced static hydraulic pressure test at 25 pounds per square inch for at least one hour.
SPS 390.14(10) (10)Filters.
SPS 390.14(10)(a)(a) Design. Filters shall be specified so that when operated and maintained in accordance with the manufacturer's printed instructions, the system provides the water clarity required in ch. DHS 172.
SPS 390.14(10)(b) (b) Maximum flow rate.
SPS 390.14(10)(b)1.1. Filters other than high rate sand filters shall be specified so that the maximum flow rate does not exceed those under ANSI/NSF 50.
SPS 390.14(10)(b)2. 2. High rate sand filters shall be specified so that the maximum flow rate does not exceed 15 gallons per minute per square foot or bed surface area.
SPS 390.14(10)(c) (c) Pressure release.
SPS 390.14(10)(c)1.1. Pressure-type filters shall be provided with a means to permit the release of internal pressure.
SPS 390.14(10)(c)2. 2. Filters incorporating an automatic air vent as the principal means of air release shall have a lid that provides a slow and safe release of pressure as a part of the design and have manual air release in addition to the automatic release.
SPS 390.14(10)(c)3. 3. Separation tanks used in conjunction with a filter tank shall comply with subd. 2.
SPS 390.14(10)(c)4. 4. The following statement shall be placed within the area of the air release so as to be clearly visible: "WARNING. DO NOT START UP THE SYSTEM AFTER MAINTENANCE WITHOUT FIRST OPENING THE AIR RELEASE AND PROPERLY ASSEMBLING THE FILTER AND SEPARATION TANK."
SPS 390.14(11) (11)Circulation piping.
SPS 390.14(11)(a)(a) Circulation piping shall be listed as meeting one of the following methods:
SPS 390.14(11)(a)1. 1. ANSI/NSF 50 by a listing agency acceptable to the department.
SPS 390.14(11)(b) (b) All circulation piping shall be listed to withhold a pressure 50 percent greater than the maximum design pressure.
SPS 390.14(12) (12)Pumps and motors.
SPS 390.14(12)(a)(a) All circulation pumps shall be capable of providing the design flow rates at one of the following minimum total dynamic heads:
SPS 390.14(12)(a)1. 1. Eighty feet for diatomaceous earth filters.
SPS 390.14(12)(a)2. 2. Seventy feet for sand or cartridge filters.
SPS 390.14(12)(a)3. 3. Fifty feet for vacuum filters.
SPS 390.14(12)(a)4. 4. A maximum total dynamic head value recommended by the filter manufacturer that allows the filter to function under all operating conditions.
SPS 390.14(12)(b) (b) Pumps located below the waterline of a basin shall have isolation valves installed on suction and discharge lines.
SPS 390.14(12)(c) (c) Pumps located above the waterline of the pool shall be self-priming or the system shall be designed to provide a means for priming.
SPS 390.14(12)(d) (d) Intake strainers shall be provided upstream of all circulations pumps on pressure filter systems.
SPS 390.14(12)(e) (e) Mechanical seals shall be corrosion resistant.
SPS 390.14(13) (13)Return inlets and suction outlets.
SPS 390.14(13)(a)(a) Inlets and outlets shall be provided and arranged to produce a uniform circulation of water and maintain the distribution of sanitizer residual throughout the pool.
SPS 390.14(13)(b) (b) Return inlets.
SPS 390.14(13)(b)1.1. Return inlets shall be designed and installed so as to not constitute a hazard to the patron.
SPS 390.14 Note Note: An example of an inlet installation constituting a hazard to a patron is an inlet installed on a racing lane cross.
SPS 390.14(13)(b)2. 2. There shall be at least 2 inlets per circulation system.
SPS 390.14(13)(b)3. 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
SPS 390.14 Note Note: See ch. SPS 390 Appendix for inlet velocity information.
SPS 390.14(13)(b)4. 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.
SPS 390.14(13)(b)5. 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.
SPS 390.14(13)(b)6. 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.
SPS 390.14(13)(b)7. 7. Bottom return inlets shall be flush with the basin floor.
SPS 390.14(13)(b)8. 8. Bottom return inlets shall be considered to have an area of influence of a radius of 10 feet.
SPS 390.14 Note Note: See ch. SPS 390 Appendix for further explanatory material.
SPS 390.14(13)(b)9. 9. Wall return inlets may not extend more than one inch into a basin.
SPS 390.14(13)(b)10. 10. Except for leisure rivers, there shall be a wall return inlet within 5 feet of each corner of a basin wall.
SPS 390.14(13)(c) (c) Suction outlets.
SPS 390.14(13)(c)1.1. 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:
SPS 390.14(13)(c)1.a. a. All basins shall be provided with a suction outlet in the lowest point of the basin in the floor or the wall.
SPS 390.14 Note Note: For main drains installed in diving wells, see Figure 390.11-1 and Table 390.11-1.
SPS 390.14(13)(c)1.b. 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.
SPS 390.14(13)(c)1.c. 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.
SPS 390.14(13)(c)2. 2. Suction outlet grates shall comply with at least one of the following requirements:
SPS 390.14(13)(c)2.a. a. A single grate having at least one dimension of length, width, diagonal or diameter that is at least 36 inches.
SPS 390.14(13)(c)2.b. b. Two or more grates of any size separated from other suction outlets by at least 3 feet.
SPS 390.14(13)(c)3. 3. Suction systems shall be designed so that the maximum flow rates are not exceeded under operating conditions.
SPS 390.14(13)(c)4. 4. Suction grates and covers shall be listed as conforming to ASME/ANSI A112.19.8.
SPS 390.14(13)(c)5. 5. The maximum opening of any suction grate shall prevent the passage of a ½-inch sphere.
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