Located behind 6066 Pine Ridge is a 30,000 Imperial gallon (about 136,000 litres or 136 cubic meters) concrete reservoir and a small building housing a pressurizing system for the benefit of houses at the top of the subdivision.
Recharging the pressure tanks.
Equipment includes 1 Grundfoss 2 hp vertical axis pump connected to 2 WellMate WM450 pressure tanks. The pump maintains a line pressure of between 40 and 60 psi. There is a small pressure relief valve (PRV) on the line into each tank to help protect the tank from pressure transients. These PRVs are not adjustable. There is also a 3/4 hp backup pump.
The big pump is controlled by a 40A start relay in the duplex box. Original relays were Siemens .... which are now obsolete. Replaced with Eaton C25DNF240A purchased from Amazon.com during the summer of 2017.
Under normal conditions, the large pump should run for about 5 minutes to bring the pressure in the tanks up to to 60 psi and should remain off for about 12 minutes. Significant variation from that could indicate a problem. This "rule of thumb" needs to be tested and adjusted so it's appropriate and relevant for the season, number of households, etc.
The main service items here are the pumps, air precharge in the pressure tanks and the small check valves in the lines into and out of the pumps. There is also a large 6-inch check valve on the main water line that was replaced in the spring of 2007 and again in October, 2009. A spare valve is kept in the pump house. This large check valve's function is to allow large volumes of water to be pulled through the lines to fire hydrants but will keep pressurized water from leaking back into the reservoir. If the valve is leaking, a slight hissing noise will be heard coming from the valve and the resulting loss in pressure will cause the pressurizing pump to cycle on and off more often.
A generator is also on site which will run the small emergency pump and provide building heat and light in the event of a power outage.