Section NR 811.31 - Line-shaft vertical turbine pumps(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: (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.(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.(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.(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. (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.(2) PUMP LUBRICATION. (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.(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.Wis. Admin. Code Department of Natural Resources NR 811.31
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.Amended by, CR 22-074: cr. (1m), am. (2) (b) Register January 2024 No. 817, eff. 2/1/2024