Section NR 811.81 - Pumps and pressures(1) The booster pumps shall maintain static pressures in the area served within the range of 35 to 100 psi under normal operating conditions.(2) The pump capacities for domestic service only shall be as established in Figure No. 1 in the Appendix, or as justified by additional engineering studies. Fire protection shall be provided if feasible and will require additional engineering studies.(3) Pumping stations which serve more than 50 living units shall be designed such that the peak demand can be met with the largest pump out of service.(4) For pumps not directly supplied by an adjacent reservoir or elevated tank, the suction pressure shall be at least 35 psi when the pumps are supplying design flow rates. An automatic cutoff control shall be provided that will stop the pumps when the suction pressure falls below 20 psi.(5) For pumps supplied by an adjacent but not physically connected reservoir or elevated tank, the suction pressure shall be at least 3 psi under all pumping conditions. An automatic cutoff control shall be provided that will stop the pumps when the suction pressure falls below 3 psi.(6) For those stations servicing a boosted zone without elevated storage, one of the following shall be provided: (a) A continuously running pump to maintain pressure in the boosted zone. A small feed back line or other means shall be provided to prevent the pump from overheating.(b) A single speed pump and one or more hydro-pneumatic tanks with a total gross volume at least ten times the rated gallon per minute capacity of the pump.(c) A pump fitted with a 2 to 3 minute minimum run timer and one or more hydro-pneumatic tanks to prevent frequent pump cycling.(d) A pump controlled by a variable output control device along with one or more hydro-pneumatic tanks having a total gross volume meeting the requirements of s. NR 811.34(6).Wis. Admin. Code Department of Natural Resources NR 811.81
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.