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(a) A pump suction compound gauge shall be included in all circulation systems.
(b) A pump discharge gauge shall be located upstream of all throttling valves.
(c) A filter pressure gauge shall be included serving all filters in circulation systems.
(d) A flow meter capable of displaying flow during filtration shall be included in all circulation systems.
(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.
(10) Filters.
(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. ATCP 76.
(b) Maximum flow rate.
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.
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.
(c) Pressure release.
1. Pressure-type filters shall be provided with a means to permit the release of internal pressure.
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.
3. Separation tanks used in conjunction with a filter tank shall comply with subd. 2.
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.”
(11) Circulation piping.
(a) Circulation piping shall be listed as meeting one of the following methods:
1. ANSI/NSF 50 by a listing agency acceptable to the department.
2. Chapter SPS 384.
(b) All circulation piping shall be listed to withhold a pressure 50 percent greater than the maximum design pressure.
(12) Pumps and motors.
(a) All circulation pumps shall be capable of providing the design flow rates at one of the following minimum total dynamic heads:
1. Eighty feet for diatomaceous earth filters.
2. Seventy feet for sand or cartridge filters.
3. Fifty feet for vacuum filters.
4. A maximum total dynamic head value recommended by the filter manufacturer that allows the filter to function under all operating conditions.
(b) Pumps located below the waterline of a basin shall have isolation valves installed on suction and discharge lines.
(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.
(d) Intake strainers shall be provided upstream of all circulations pumps on pressure filter systems.
(e) Mechanical seals shall be corrosion resistant.
(13) Return inlets and suction outlets.
(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.
(b) Return inlets.
1. Return inlets shall be designed and installed so as to not constitute a hazard to the patron.
Note: An example of an inlet installation constituting a hazard to a patron is an inlet installed on a racing lane cross.
2. There shall be at least 2 inlets per circulation system.
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.
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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.