NR 811.31(1)(1) Pump bases. Line-shaft vertical turbine pump base installations shall meet the requirements of this subsection and as shown in Figure Nos. 2 and 3 in the Appendix:

NR 811.31(1)(a)(a) Line-shaft vertical turbine pumps shall be supported by a concrete pump base which is installed to a height at least 12 inches above the pump station floor.

NR 811.31(1)(b)(b) The protective grouted casing of wells shall extend a minimum of one inch above the concrete pump base. If there is also an inner ungrouted casing, the inner casing shall extend a minimum of one inch above the pump base and the protective grouted outer casing shall extend a minimum of 4 inches above the floor and shall be incorporated into the concrete pump base. For these installations, a steel ring shall be welded between the inner and protective casings.

NR 811.31(1)(c)(c) The metal surfaces between the pump head and base plate shall be machined or gasketed to provide a watertight seal. A gasket or sealant shall be provided between the base plate and the concrete pump foundation.

NR 811.31(1)(d)(d) For high-lift line-shaft vertical turbine pumps installed above a reservoir, a steel casing shall be installed within the concrete pump base from the reservoir roof to a height above the pump base to provide a one inch sanitary lip. The requirements of pars. (a) to (c) shall also be met if applicable.

NR 811.31(1m)(1m) Column pipes. Column pipes for lineshaft vertical turbine pumps located within the well casing shall be constructed of steel, stainless steel, or galvanized steel pipe.

NR 811.31(2)(a)(a) Water lubricated pumps are required, except if oil lubricated pumps are necessary to provide positive lubrication. The oil used for pump lubrication shall be an NSF/ANSI Standard 61 approved mineral oil. Oil lubricated pumps may not be installed for wells in unconsolidated formations or for wells with shallow pump settings less than 250 feet.

NR 811.31(2)(b)(b) For water lubricated pumps with static water levels deeper than 50 feet, provision shall be made for prelubricating the column bearings prior to pump startup. All prelubrication water lines shall be equipped with metering and controls to monitor and limit the volume of prelubrication water. At systems where chemical addition is practiced, solenoid valve control of the prelubrication water line shall be provided. If auxiliary power is provided, additional valving of the prelubrication water line shall be provided. When pump backspin is allowed to occur after the motor shuts off, the design engineer for the water system owner shall determine the necessity for lubrication during this period and provide for lubrication if necessary.

NR 811.31 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; CR 22-074: cr. (1m), am. (2) (b) Register January 2024 No. 817, eff. 2-1-24.

NR 811.32(1)(1) Pump bases. If a submersible pump is used, the top of the well casing shall be effectively sealed against entrance of water under all conditions including vibration or movement of conductors or cables. Requirements for the installation of pitless units are provided in s. NR 811.35. Submersible pump installations shall meet the requirements of this subsection and as shown in Figure Nos. 4, 5, and 6 in the Appendix:

NR 811.32(1)(a)(a) Termination above grade. The protective casing shall terminate above grade a minimum of 12 inches above a concrete floor. Submersible pump discharge pipes shall be extended to terminate through the top of the well casing.

NR 811.32(1)(b)(b) Well seals. Well seals shall consist of a sanitary surface plate bolted down with a gasketed or machined seal to a flange welded to the well casing or alternatively, a department approved well seal with one-piece top plate. All openings in the well seal shall be sealed watertight with grommets or compression fittings to prevent the entrance of contaminants.

NR 811.32(1)(c)(c) Protective collars and pump bases.

NR 811.32(1)(c)1.1. The protective casing shall terminate at least 12 inches above the floor and be surrounded by a pump base or a minimum 1.5-inch thick concrete collar. Either the pump base or the concrete collar shall be installed to a height at least 6 inches above the floor.

NR 811.32(1)(c)2.2. If a pump base is installed, any other outer well casing shall be terminated a minimum of 4 inches above the finished floor and incorporated into the pump base.

NR 811.32(1)(c)3.3. A short section of outer well casing may be installed around the protective casing and the annular space between the 2 casings filled with grout to meet the collar requirement of subd. 1.

NR 811.32(2)(2) Drop pipes. Vertical drop pipes for submersible pumps located within the well casing shall be constructed of steel, stainless steel, or galvanized steel pipe. The department shall be contacted to request approval for an alternate minimum 150 psi pressured rated plastic drop pipe material specification which shall be granted if its use can be justified due to a corrosive water condition. All vertical drop pipe material specifications shall meet or exceed the requirements of s. NR 812.28 and the Pipe and Tubing for Water Services and Private Water Mains table found in SPS Table 384.30-7.

NR 811.32 HistoryHistory: CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10; correction in (2) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.

NR 811.33NR 811.33 Motor protection. If backspin can be expected to occur, the motor shall be provided with a time delay or non-reverse ratchet to protect the motor in case the pump controls are energized before the pump stops backspinning.

NR 811.34NR 811.34 Pump variable output control devices. Installations where pumps and pump motors will be physically or electronically controlled by a variable output control device shall meet the following requirements:

NR 811.34(1)(1) Pumping capacity to meet peak demand. The gallon per minute discharge rates of the pump or pumps shall be capable of meeting the peak demand rate when there is no elevated storage and the pressure tank storage volume will be reduced due to the installation of the variable output control device or devices.

NR 811.34(2)(2) High pressure cut-out switch. A high pressure cut-out switch shall be installed on the pump discharge piping to stop the pump motor when a preset maximum discharge pressure is detected if the pump shut-off head at the maximum possible speed will exceed the safe working pressures of the piping and appurtenances.

NR 811.34(3)(3) Pressure relief valve. A pressure relief valve shall be installed on the pump discharge piping sized to allow adequate pressure to be relieved if a malfunction that would cause the pump to discharge at the maximum possible rate would result in pressures exceeding the safe working pressures of the piping and appurtenances.

NR 811.34(4)(4) Backup controls. All water systems supplied by one well or booster pump shall be provided with a redundant means of controlling the operation of the pump motor. Such means may include the installation of an electrical bypass of the variable output control device along with the installation of pressure switches or other department approved installation.