Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 811 - Requirements For The Operation And Design Of Community Water Systems › Subchapter V - Pumping Equipment and Appurtenances › Section NR 811.37 - Pump discharge lines

Current through June 24, 2024
Pump discharge lines shall meet the requirements of this
					 section and as shown in Figure Nos. 8 and 9 in the Appendix.
(1) BURIED LINES. Adequate positive pressure
				  shall be maintained on all buried piping. Pump suction and discharge lines that
				  are to be buried shall be designed so that the line is under a continuous
				  pressure head that is higher than the elevation of the ground surface under all
				  operating conditions. Lines where a positive pressure head that is higher than
				  the elevation of the ground surface cannot be maintained may be installed if
				  the lines are encased for their entire length in a watertight pipe conduit or a
				  tunnel. Buried lines that, under all operating conditions, are not under a
				  positive pressure head that is higher than the elevation of the ground surface
				  and are not encased for their entire length in watertight pipe conduit or a
				  tunnel are not permitted.
(2) ABOVE
				  GRADE PIPING MATERIALS. Above grade pump discharge line piping materials shall
				  meet the requirements of s.
				  NR 811.28 (5)
				  (b).
(3) LOCATION OF APPURTENANCES. Pump discharge
				  piping containing appurtenances such as valves, sampling faucets, water meters,
				  and other equipment shall be located above the ground surface.
(4) PUMP-TO-WASTE. All wells and high-lift
				  pump stations shall be provided with a means to pump to waste. This shall be a
				  plugged tee or blind flange or a shut-off valve followed by a hose connection
				  installed on the pump discharge piping inside the pump station. For municipal
				  and subdivision water systems, a valve and hydrant may be installed outside the
				  pump station on the buried pump discharge piping.
Note:
It is recommended that pump-to-waste
					 fittings installed inside the pump station be installed as close as possible to
					 the well or pump head in order to minimize the piping and appurtenances that
					 water to be wasted will be pumped through. The department recommends a valve
					 and hydrant be installed outside the pump station on the buried pump discharge
					 piping for municipal and subdivision water systems.
(5) PUMP DISCHARGE PIPING APPURTENANCES. The
				  following appurtenances shall be provided for pump discharge piping in addition
				  to the means for pumping the well to waste required in sub. (4). Additional
				  requirements for the installation of pump discharge piping and appurtenances
				  for pitless unit installations are given in s.
				  NR
				  811.35.
(a)
Air-vacuum and air relief valves.
The connecting and discharge
				  lines for all air-vacuum and air relief valves shall be constructed of copper,
				  ductile iron, steel, or stainless steel and shall face downward and terminate
				  with a 24-mesh corrosion resistant screen, at least 24 inches above the floor.
				  For line-shaft vertical turbine pump discharge pipes, an air-vacuum relief
				  valve shall be installed between the pump and the check valve. For well
				  line-shaft vertical turbine pump discharge pipes that discharge directly to
				  reservoirs, the air relief valve is not required but a vacuum relief valve and
				  a check valve are required. The installation of an air-vacuum relief valve is
				  not required for submersible pump installations when check valves are installed
				  at the pump and above grade, and there are no weep holes in the pump drop pipe
				  unless entrained air in the well water or pressure surges are a concern and the
				  installation of an air relief valve is necessary or required by the
				  department.
(b)
Sampling
				  faucet.
All pump discharge piping shall contain one or more sampling
				  faucets meeting the following requirements:
1.
				  A water sampling faucet shall be installed and located upstream of any chemical
				  addition or water treatment equipment to allow for the collection of raw water.
				  If possible, the faucet shall be located prior to any above grade check
				  valve.
2. If chemical addition,
				  water treatment, or water storage is installed, a second entry point sampling
				  faucet shall be installed as far downstream of the chemical injection, water
				  treatment, or water storage as practical. If necessary to obtain a water sample
				  representing finished water quality, a water service lateral shall be brought
				  back into the building and fitted with a sampling faucet after being connected
				  to the building discharge water main outside the building.
3. All sampling faucets shall be installed to
				  terminate a minimum of 12 inches above the floor, have a down-turned smooth-end
				  spout, be constructed of metal, have a minimum spout diameter of 0.25 inches,
				  be installed directly on the piping conveying the water whenever possible, and
				  be located in an area accessible for sampling.
(c)
Check valve or other type of
				  automatically closing valve.
A check valve shall be provided except if
				  prohibited at pitless unit installations under s.
				  NR 811.35
				  (5). Where extreme surge pressures occur,
				  slow opening valves, voltage ramped motors, or other means of surge protection
				  shall be provided.
(d)
Meters.
All municipal well pump discharge pipes, all
				  other-than-municipal well pump discharge pipes with pumps discharging at a rate
				  greater than or equal to 70 gallons per minute or if chemical addition is
				  practiced, all groundwater reservoir high-lift pumps if chemical addition is
				  practiced, and all surface water low-lift and high-lift combined pump discharge
				  pipes shall be provided with water meters to determine the quantity of water
				  discharged.
Note:
It is recommended that an hour meter be
					 installed for any pump motor where the pump discharge piping will not be
					 provided with a water meter.
(e)
Shut-off valve.
A
				  shut-off valve shall be provided.
(f)
Pressure gauge.
A
				  pressure gauge shall be provided.
(g)
Chemical injection tap.
A chemical injection tap allowing chemical injection, shall be provided and
				  installed in accordance with s.
				  NR 811.39 (2)
				  (f).