Section 811.32. Submersible vertical turbine pumps.

 

(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:

(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.

(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.

(c) Protective collars and pump bases.

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.

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.

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.

(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.

History: 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 .