NR 812.32(5)(b)3.b.b. Oil lubricated lineshaft turbine pumps may be used for potable wells when the pumping water level is deeper than 250 feet except when the pump operation is expected to lower the water level in the well to a depth less than 5 feet above the bottom of the well casing pipe. Oil lubricated lineshaft turbine pumps may be used for wells provided the lubricants are USDA or FDA approved food contact grade formulations.

NR 812.32(6)(a)(a) Pressurized. Discharge lines from lineshaft turbine pumps that are maintained under system pressure at all times shall contain an air-vacuum relief valve preceding a check valve. A well vent shall be installed in the pump base. High capacity well pump installation is depicted in Figure 3 of ch. NR 812 Appendix.

NR 812.32(6)(b)(b) Nonpressurized. Discharge lines from lineshaft turbine pumps shall contain an UL approved check valve and an air-vacuum relief valve near the pump, and prior to any buried portion of discharge pipe. When water is pumped to a pond or other body of water, the end of the pump discharge pipe shall be extended at least 2 feet above the highest elevation of the water in the pond or other body of water.

NR 812.32(7)(a)(a) Hand pump heads shall be designed and fabricated so there are no unprotected openings, other than the spout, to the interior of the pump. The water spout shall turn downward and be closed on top. If a separate watertight port is provided for priming, it shall be sealed watertight when not being used. Unsealed openings may not exist in the pumpbase. If the pump is installed outside, a concrete crack-free watertight pump platform at least 6 feet in diameter shall be provided. The top of this platform may be at ground grade, but in any case the platform shall be mounded so that water does not accumulate around the well. If excess water flow from the pump spout is channelized, it shall be directed to a point at least 8 feet from the well with a drain pipe or watertight channel.

NR 812.32(7)(b)(b) Hand pumps shall be connected firmly to the well casing pipe by threading in small diameter well casing pipe or by bolting the pumpbase flange to a well casing pipe flange with a gasket to seal the top of the casing. Other types of hand pump bases may be used if they meet the approval requirements specified in s. NR 812.091 for vermin-proof caps and seals.

NR 812.32(9)(b)(b) Unprotected suction lines. An off-set shallow well pump may not be connected directly to the buried pipe exiting a pitless adapter or unit of a flowing well or to a pipe extending out of the seal at the top of the well and redirected back into the ground. Buried piping from the flowing well shall discharge to a surge tank having either an overflow pipe or an air-vacuum relief valve installed in the top of the tank. A booster pump shall be connected to the surge tank and discharge into a pressure tank.

NR 812.32(9)(c)1.1. When a flowing well is placed in use, the flow from the well shall be regulated by means of a control valve with a screened outlet or with a restricting orifice to prevent waste of water. The control valve shall be restricted as much as possible and closed if the flow ceases.

NR 812.32(9)(c)2.2. A controlled overflow pipe or other means shall be installed for a flowing well to prevent damage from overflowing water or to prevent freezing of the top of the well.

NR 812.32(9)(c)3.3. When necessary, overflow piping shall be installed to prevent flow of water up the outside of the well casing pipe or to prevent freezing of water inside the casing. When installed, the flow of water from the discharge pipe shall be limited to a minimum so as to preserve groundwater and water pressure. The overflow pipe shall be installed to extend through the well cap or seal or shall extend off a surge tank in the basement. The overflow pipe may be attached to the outside wall of the well casing pipe if both the point of exit from the well casing pipe and the terminus of the overflow are at least 12 inches above the ground grade and the connection to the well casing pipe is watertight. The overflow pipe shall terminate at least 2 pipe diameters above any drain inlet at the well site, in a building or in a building basement. If the overflow is installed at the well head, the overflow shall extend at least 2 feet above the regional flood elevation and a free air gap of at least 2 pipe diameters above the drain shall be provided. The receiving drain shall discharge to the ground or to a gravel pocket at a point at least 8 feet from the well. A funnel receptacle shall be installed on the inlet of the drain to accept all of the overflow water, to prevent splashing and prevent ponding of water around the well casing pipe. If a pump is installed in the well and the well stops flowing during pumping, a screen shall be installed on the overflow pipe.

NR 812.32 HistoryHistory: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (2) (a) 1. and 5., (6) (b) and Figure 32, renum. (4) (b), (6) (c), (7) and (8) to be (4) (b) 1., (7) to (9) and am. (7), (9) (c) 2. and 3., cr. (1) (a) 6., (d) and (4) (b) 2., Register, September, 1994, No. 465, eff. 10-1-94; correction in (4) (b) 1. c. made under s. 13.93 (2m) (b) 7., Stats., Register, May, 2000, No. 533; correction in (4) (b) 1. c. made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672; reprinted to reinsert omitted text in (4) Register January 2012 No. 67; CR 13-099: am. (1) (a) (intro.), cr. (1) (e), (f), am. (2) (b), cr. (4) (c), (d), am. (5) (b) 3. b., (6) (b), (9) (c) 3., cr. (9) (d) Register September 2014 No. 705, eff. 10-1-14; correction in (9) (d) title made under s. 13.92 (4) (b) 2., Stats., Register September 2014 No. 705; CR 18-095: am. (1) (a) 2., (c), (2) (a) 1., 3., r. (2) (a) 5., am. (2) (b), (3), (5) (b) 2. a. to d., (6) (a), (7), (9) (d) Register June 2020 No. 774, eff. 7-1-20; correction in (1) (a) 1. to 4., (c) made under s. 35.17, Stats., Register June 2020 No. 774.

NR 812.33(1)(a)(a) General. Tanks relying on expansion of a flexible membrane within a restricting container, rather than on a water to air interface to provide pressure in the water system, may be used. All pressure tanks for storing potable water under pressure, including those having an air space for expansion, shall be identified by seal, label or plate indicating the manufacturers name and model number and shall meet the following specifications:

NR 812.33(1)(a)1.1. Pressure tanks to be buried shall be constructed of steel, fiberglass or other comparable non-metallic composite material. Steel tanks with metallic discharge piping, meeting the requirements of s. NR 812.28, shall be used in contaminated soil areas. Steel tanks to be buried shall have a minimum wall thickness of 0.25 inches. Fiberglass or other non-metallic tanks to be buried shall have the structural strength to prevent collapse of the tank. Manufacturer’s instructions shall be followed. All buried tanks shall be back-filled in place with sand, compacted in place. Steel pitless receiver tanks, when they are part of approved pitless units attached directly to the well casing pipe, shall also have a minimum wall thickness of 0.25 inches. Any air unloader pipe, tank air valve or any other pipe connection extending up to the ground surface shall be steel pipe meeting the requirements of s. NR 812.28 and shall terminate at least 12 inches above ground grade.

NR 812.33 NoteNote: The department recommends that a surface air check kit be installed for a buried pressure tank to check, maintain and adjust the air pressure pre-charge of the tank. Also, in uncontaminated soil areas, pipe and pipe connections to the tank should be made with flexible pipe and fittings meeting the requirements of s. NR 812.28 to minimize strain or pressure on the tank or the tank fittings.