NR 812.31(3)(a)3. 3. Welding a pipe nipple, having threads on one end, beveled on the other end and meeting the requirements specified in s. NR 812.11 (6), to the cut off top beveled end of the well casing pipe and threading a full-length standard recessed coupling watertight to the threaded end of the unit and to the nipple. The top of the well casing pipe and the bottom of the pipe nipple to be welded shall both have beveled ends. If the pitless unit has female threads, the unit may be threaded watertight directly to the threaded end of the nipple.

NR 812.31(3)(a)4. 4. Reaming out the threads of a full standard recessed coupling, at least 1/3 the length of the coupling, and welding the coupling to the top of the cut-off well casing pipe with a fillet weld on the inside or the outside contact surface of the coupling.

NR 812.31(3)(b) (b) When installing a factory assembled pitless unit, the following restrictions shall be followed:

NR 812.31(3)(b)1. 1. The threaded lower end of a pitless unit may not be welded to the cut-off end of a well casing pipe.

NR 812.31(3)(b)2. 2. The threaded ends of a short model, factory-assembled pitless unit may not be welded to the top of a cut-off well casing pipe nor to the section of riser pipe extending from the unit to ground grade, except that the unit may be welded to the cut-off well casing pipe and to the riser pipe if the ends of the unit, the well casing pipe, and the riser pipe are cut and beveled according to par. (a) 1.

NR 812.31(3)(b)3. 3. Factory-assembled pitless units, including those fabricated with pitless receiver tanks, may not be connected to the well casing pipe by means of a compressible joint.

NR 812.31(4) (4) Pitless unit and pitless adapter connections to thermoplastic well casing pipe.

NR 812.31(4)(a) (a) Steel well casing pipe, pitless units or pitless adapters may not be welded after they are attached to thermoplastic well casing pipe. The thermoplastic coupling shall be threaded onto the pitless unit before it is solvent cemented to the top of the thermoplastic well casing pipe. Pitless unit connections for thermoplastic well casing pipe are depicted in Figure 2.

NR 812.31(4)(b) (b) Only approved lubricant specifically intended for use with thermoplastic well casing pipe may be used with threaded couplings used for pitless units and pitless adapters. A threaded joint shall be tightened no more than one full turn using a strap wrench.

NR 812.31(4)(c) (c) Threaded couplings may only be used for installation of pitless units or pitless adapters after placement of the well casing pipe.

NR 812.31(4)(d) (d) The portion of the well casing pipe above a short length pitless unit shall be steel or thermoplastic well casing pipe meeting the requirements specified in s. NR 812.11.

NR 812.31(4)(e) (e) When thermoplastic well casing pipe is extended above the ground surface, the thermoplastic pipe shall be of the type with inhibitors recommended for use in direct sunlight or shall be contained in a pumphouse or in an oversized steel pipe extending from below the frost depth to the top of the thermoplastic pipe.

NR 812.31(4)(f) (f) A permanent tag bearing the message “plastic well casing pipe” shall be attached to the top of the well.

NR 812.31(5) (5) Pitless receiver tanks. Pitless receiver units shall be approved for use under s. NR 812.091.

NR 812.31(5)(a) (a) Steel buried tanks that are part of a pitless unit shall have a minimum wall thickness of 1/4-inch and shall have an identifying seal, label, or plate showing the manufacturer’s name and model number.

NR 812.31(5)(b) (b) An approval under s. NR 812.09 shall be obtained for the installation of a buried pitless receiver tank having a gross volume greater than 1,000 gallons.

NR 812.31 History History: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (intro.), (1), (2) (a), (b) and (d), (3) (a) 3., (5) (a) and Figure 28, cr. (5) (intro.), Register, September, 1994, No. 465, eff. 10-1-94; CR 13-099: am. (2), (4) (e) Register September 2014 No. 705, eff. 10-1-14; CR 18-095: am. (2) (a), (c), (3) (a) (intro.), 3., (b) (intro.), (4) (a), (d), (e), (5) Register June 2020 No. 774, eff. 7-1-20; correction in (1) made under s. 35.17, Stats., Register June 2020 No. 774; CR 21-070: am. (2) (a) Register July 2022 No. 799, eff. 8-1-22.

NR 812.32 NR 812.32 Pumps.

NR 812.32(1) (1) General pump installation requirements.

NR 812.32(1)(a) (a) Pump installations shall be carried out so the pump installation will be:

NR 812.32(1)(a)1. 1. Installed so it and its surroundings are in a sanitary condition.

NR 812.32(1)(a)2. 2. Properly sized to provide the volume of water necessary, where obtainable, for an adequate water supply.

NR 812.32(1)(a)3. 3. Designed to meet the well characteristics and not exceed the yield of the well except when the available aquifer is low producing.

NR 812.32(1)(a)4. 4. Installed for operation without priming or breaking suction.

NR 812.32(1)(a)5. 5. Installed in such manner as to provide adequate protection against contamination of the water supply from any surface or subsurface sources.

NR 812.32(1)(a)6. 6. Installed in a manner so that it is accessible for maintenance, repair and removal.

NR 812.32(1)(b) (b) Pump motor lubricant or coolant oil shall be USDA or FDA approved food contact grade formulations.

NR 812.32 Note Note: Such formulations are usually based on National Formulary, white food grade mineral oil or inhibited propylene glycol with FDA approved components.

NR 812.32(1)(c) (c) Every pump shall be installed with an above-ground discharge, an approved subsurface pitless adapter or pitless unit, or an approved subsurface well casing pipe connection.