SPS 382.40(4)(b)2. 2. `Curb stops.'
SPS 382.40(4)(b)2.a.a. Except for water services serving farm buildings and farm houses, a curb stop shall be installed in each water service which connects to a private water main. The curb stop shall be located outside the building served by the water service.
SPS 382.40(4)(b)2.b. b. Except as provided in subd. 2. c., a curb stop shall be installed in each water service which connects to a public water main. The curb stop shall be located between the corporation cock and the property line.
SPS 382.40(4)(b)2.c. c. If a water service 2-1/2" or larger in diameter connects to a public water main, one control valve may serve as the corporation cock and the curb stop. The control valve shall be located not more than 8 feet from the connection to a public water main and shall be accessible for operation.
SPS 382.40(4)(b)3. 3. `Building control valves.' If a water service serves a building, a building control valve shall be provided in the water service as specified in this subsection.
SPS 382.40(4)(b)3.a. a. If the water service connects to a public water supply or to a private water supply which has an external pressure tank, the building control valve shall be installed inside the building and located within 3 feet of developed length from the point where the water service first enters the building. If a water meter is provided, the building control valve shall be located upstream of the water meter.
SPS 382.40(4)(b)3.b. b. If a private water supply includes an internal pressure tank, the building control valve shall be installed inside the building and located within 3 feet of developed length downstream from the internal pressure tank.
SPS 382.40 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.40(4)(c) (c) Water distribution systems.
SPS 382.40(4)(c)1.1. Control valves shall be installed in water distribution systems serving public buildings as specified in this subdivision.
SPS 382.40(4)(c)1.a. a. If a water meter is provided, a control valve shall be installed within 3 feet of developed length downstream from the outlet of the water meter. If bypass piping is provided around a water meter, a control valve shall be installed in the bypass piping.
SPS 382.40 Note Note: See sub. (8) (d) 3. for the requirements relating to the bypassing of water meters.
SPS 382.40(4)(c)1.b. b. A control valve shall be installed in the supply piping to each water heater and water treatment device and in the fixture supply to each plumbing fixture, plumbing appliance and piece of equipment. The control valve may be part of the bypass piping or an internal part of a water treatment device. When the valve is an internal part of the water treatment device, the device shall be removable for service.
SPS 382.40(4)(c)1.c. c. If a hot water circulation system is provided, a control valve shall be installed on both the inlet and outlet piping to the circulation pump. If a hot water circulation system has 2 or more return pipe lines, a balancing control valve shall be installed in each return piping line.
SPS 382.40(4)(c)1.d. d. The water distribution system for buildings with more than 4 dwelling units or living units shall be provided with control valves in such numbers and at such locations so that the water supplied to all the units within the building can be isolated into groups of 4 of less units.
SPS 382.40 Note Note: See sub. (8) (g) for the valve requirements for water temperature control.
SPS 382.40(4)(c)2. 2. Control valves shall be installed in water distribution systems serving one- and 2-family dwellings as specified in this subdivision.
SPS 382.40(4)(c)2.a. a. If a water meter is provided, a control valve shall be installed within 3 feet of developed length downstream from the outlet of the water meter. If bypass piping is provided around a water meter, a control valve shall be installed in the bypass piping.
SPS 382.40 Note Note: See sub. (8) (d) 3. for the requirements relating to the bypassing of water meters.
SPS 382.40(4)(c)2.b. b. A control valve shall be installed in the supply piping to each water heater and water treatment device and in the fixture supply to each water closet, exterior hose bibb, plumbing appliance and piece of equipment. When the valve is an internal part of the water treatment device, the device shall be removable for service.
SPS 382.40(4)(c)2.c. c. If a hot water circulation system is provided, a control valve shall be installed on both the inlet and outlet piping to the circulation pump. If a hot water circulation system has 2 or more return pipe lines, a balancing control valve shall be installed in each return piping line.
SPS 382.40(5) (5)Hot water supply systems.
SPS 382.40(5)(a)(a) General. Water heating systems shall be sized to provide sufficient hot water to supply peak demand.
SPS 382.40 Note Note: Residential exclusion see s. SPS 325.01 (2).
SPS 382.40(5)(b) (b) Temperature maintenance. If the developed length of hot water distribution piping from the source of the hot water supply to a plumbing fixture or appliance exceeds 100 feet, a circulation system or self-regulating electric heating cable shall be provided to maintain the temperature of the hot water within the distribution piping.
SPS 382.40(5)(b)1. 1. If a circulation system is used to maintain the temperature, no uncirculated hot water distribution piping may exceed 25 feet in developed length.
SPS 382.40(5)(b)2. 2. If a self-regulating electric heating cable is used to maintain the temperature, the cable shall extend to within 25 feet of each fixture or the appliance.
SPS 382.40(5)(b)3. 3. Water distribution piping conveying circulated water or served by a self-regulating electric heating cable shall be insulated to limit the heat loss at the external surface of the pipe insulation to a maximum of 25 BTUs per hour per square foot for aboveground piping and 35 BTUs per hour per square foot for underground piping. The maximum heat loss shall be determined at a temperature differential, T, equal to the maximum water temperature minus a design ambient temperature no higher than 65° F.
SPS 382.40(5)(b)4. 4. Water distribution piping served by self-regulating electric heating cable shall be identified as being electrically traced in accordance with ch. SPS 316.
SPS 382.40(5)(b)5. 5. The installation of self-regulating electric heating cable may be subcontracted by a plumber to another trade.
SPS 382.40 Note Note: See A-382.40 (5) for pipe insulation requirements.
SPS 382.40(5)(c) (c) Water heaters. All water heaters and safety devices shall be designed and constructed in accordance with s. SPS 384.20 (5) (p).
SPS 382.40 Note Note: Water heaters are to be installed in accordance with the requirements specified in chs. SPS 361 to 366 and chs. SPS 320 to 325 with respect to energy efficiency, enclosures and venting.
SPS 382.40(5)(d) (d) Safety devices. Water heaters shall be equipped with safety devices as specified in this paragraph.
SPS 382.40(5)(d)1. 1. All pressurized storage-type water heaters and unfired hot water storage tanks shall be equipped with one or more combination temperature and pressure relief valves. The temperature steam rating of a combination temperature and pressure relief valve or valves shall equal or exceed the energy input rating in BTU per hour of the water heater. No shut off valve or other restricting device may be installed between the water heater or storage tank and the combination temperature and pressure relief valve.
SPS 382.40 Note Note: The temperature steam rating of a combination temperature and pressure relief valve is commonly referred to as the AGA temperature steam rating.
SPS 382.40(5)(d)2. 2. All pressurized non-storage type water heaters shall be provided with a pressure relief valve installed at the hot water outlet with no shut off valve between the heater and the relief valve.
SPS 382.40(5)(d)3. 3. Temperature and pressure relief valves shall be installed so that the sensing element of the valve extends into the heater or tank and monitors the temperature in the top 6" of the heater or tank.
SPS 382.40(5)(d)4. 4. A vacuum relief valve shall be installed in each water heater and hot water storage tank which, when measured from the bottom of the heater or tank, is located more than 20 feet above any faucet or outlet served by the heater or tank.
SPS 382.40(5)(d)5. 5. Every relief valve which is designed to discharge water or steam shall be connected to a discharge pipe.
SPS 382.40(5)(d)5.a. a. The discharge pipe and fittings shall be made of a material acceptable for water distribution piping in accordance with s. SPS 384.30 (4) (e) 1.
SPS 382.40(5)(d)5.b. b. The discharge pipe and fittings shall have a diameter not less than the diameter of the relief valve outlet.
SPS 382.40(5)(d)5.c. c. The discharge pipe may not be trapped.
SPS 382.40(5)(d)5.d. d. No valve may be installed in the discharge pipe.
SPS 382.40(5)(d)5.e. e. The discharge pipe shall be installed to drain by gravity flow to a floor served by a floor drain or to a receptor in accordance with s. SPS 382.33 (8). The outlet of the discharge pipe shall terminate within 6" over the floor or receptor, but not less than a distance equal to twice the diameter of the outlet pipe. The outlet of the discharge pipe may not be threaded.
SPS 382.40(5)(d)5.f. f. The discharge pipe for a water heater shall terminate within the same room or enclosure within which the water heater or hot water storage tank is located.
SPS 382.40(5)(e) (e) Controls.
SPS 382.40(5)(e)1.1. All hot water supply systems shall be equipped with automatic temperature controls capable of adjustments from the lowest to the highest acceptable temperature settings for the intended use.
SPS 382.40(5)(e)2. 2. A separate means shall be provided to terminate the energy supplied to each water heater and each hot water circulation system.
SPS 382.40(6) (6)Load factors for water supply systems.
SPS 382.40(6)(a)(a) Intermittent flow fixtures. The load factor for intermittent flow fixtures on water supply piping shall be computed in terms of water supply fixture units as specified in Tables 382.40-1b and 382.40-2 for the corresponding fixture and use. Water supply fixture units may be converted to gallons per minute in accordance with Table 382.40-3 or 382.40-3e.
SPS 382.40(6)(b) (b) Continuous flow devices. The load factor for equipment which demands a continuous flow of water shall be computed on the basis of anticipated flow rate in terms of gallons per minute. - See PDF for table PDF - See PDF for table PDF
a All nonpotable water outlets shall be identified at the point of use for each outlet with the following legends or as otherwise approved by the department.
b Tag should reflect the intended use.
c Serving an individual or similar plumbing fixtures or appliances. - See PDF for table PDF - See PDF for table PDF - See PDF for table PDF
SPS 382.40 Note Note: Values not specified in the table may be calculated by interpolation.
Table 382.40–3e
Conversion of Water Supply Fixture Units to Gallons
Per Minute for Water Treatment Devices
a Serving
an Individual Dwellingb - See PDF for table PDF
SPS 382.40(7) (7)Sizing of water supply piping. The sizing of the water supply system shall be based on the empirical method and limitations outlined in this subsection or on a detailed engineering analysis acceptable to the department.
SPS 382.40(7)(a) (a) Methodology. The determination of minimum pipe sizes shall take into account the pressure losses which occur throughout the entire water supply system and the flow velocities within the water distribution system. Calculations for sizing a water distribution system shall include:
SPS 382.40(7)(a)1. 1. The load factor in water supply fixture units or gallons per minute on the piping;
SPS 382.40(7)(a)2. 2. The minimum pressure available from the water main or pressure tank;
SPS 382.40(7)(a)3. 3. The pressure loss due to the differences in elevation from the:
SPS 382.40(7)(a)3.a. a. Water main or pressure tank to the building control valve; and
SPS 382.40(7)(a)3.b. b. Building control valve to the controlling plumbing fixture;
SPS 382.40(7)(a)4. 4. The pressure losses due to flow through water heaters, water treatment devices, water meters and backflow preventers;
SPS 382.40(7)(a)5. 5. The minimum flow pressure needed at the controlling plumbing fixture; and
SPS 382.40(7)(a)6. 6. The pressure losses due to flow friction through piping, fittings, valves and other plumbing appurtenances. This pressure loss may be calculated in terms of equivalent lengths of piping. The equivalent length of piping to a controlling plumbing fixture, including fittings, valves and other appurtenances, may be obtained by multiplying the developed length by 1.5.
SPS 382.40 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.40(7)(b) (b) Private water mains and water services. Private water mains and water services shall be designed to supply water to the water distribution systems to maintain the minimum flow pressures specified in par. (d), but shall not be less than 3/4" in diameter.
SPS 382.40 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.40(7)(c) (c) Maximum loading. The calculated load on any portion of the water distribution system may not exceed the limits specified in Tables 382.40-4 to 382.40-9.
SPS 382.40(7)(d) (d) Pressure.
SPS 382.40(7)(d)1.1. Except as provided in subd. 1. a. to c., water supply systems shall be designed to provide at least 8 psig of flow pressure at the outlets of all fixture supplies.
SPS 382.40(7)(d)1.a. a. The flow pressure at the outlets of the fixture supplies serving siphonic type urinals, washdown type urinals and washdown type water closets, siphonic type flushometer water closets and campsite water supply hose connections shall be at least 15 psig.
SPS 382.40(7)(d)1.b. b. The flow pressure at the outlets of the fixture supplies serving one piece tank type water closets, pressure balance mixing valves, manufactured homes, and thermostatic mixing valves shall be at least 20 psig.
SPS 382.40(7)(d)1.c. c. The flow pressure at the outlets of the fixture supplies serving blowout type urinals and blowout type water closets shall be at least 25 psig.
SPS 382.40(7)(d)2.a.a. Except as provided in subd. 3., if the water pressure available from a water main or private water supply exceeds 80 psig, a pressure reducing valve and strainer, if a strainer is not a component of the valve, shall be installed in the water distribution system.
SPS 382.40(7)(d)2.b. b. A pressure reducing valve required under subd. 2. a. shall be installed upstream from all plumbing fixtures and plumbing appliances and downstream from the water meter of an utility, if a meter is provided.
SPS 382.40(7)(d)3. 3. A pressure reducing valve shall not be required to be installed in a water distribution system which supplies water directly to a water pressure booster pump.
SPS 382.40(7)(d)4. 4. If the pressure available from the water main or private water supply is inadequate by calculation to provide the minimum pressures specified in subd. 1., a hydropneumatic pressure booster system or a water pressure booster pump shall be installed to increase the supply of water.
SPS 382.40(7)(d)4.a. a. Each water pressure booster pump shall be provided with an automatic low pressure cut-off switch. The cut-off switch shall be located on the inlet side of the pump and shall be set to terminate the energy supplied to the pump when a positive pressure of less than 10 psig occurs.
SPS 382.40(7)(d)4.b. b. A vacuum relief valve not less than one-half inch in diameter shall be installed in each water pressure tank, if the bottom of the pressure tank is more than 20 feet above any water supply outlet served by the pressure tank.
SPS 382.40(7)(e) (e) Maximum velocity. A water distribution system shall be designed so that the flow velocity does not exceed 8 feet per second.
SPS 382.40(7)(f) (f) Minimum sizes.
SPS 382.40(7)(f)1.1. Water distribution piping 1/2" in diameter serving 2 or more plumbing fixtures may not have a load of more than 2 water supply fixture units.
SPS 382.40(7)(f)2. 2. Water distribution piping 1/2" in diameter serving a shower which is not individually pressure balanced or individually thermostatically blended may not serve any additional fixtures.
SPS 382.40(7)(g) (g) Minimum sizes for fixture supplies. Except as provided in subds. 1. to 3., the fixture supplies serving all plumbing fixtures, appliances and pieces of equipment shall be at least 1/2" in diameter.
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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.