Watec was one of North America’s early adapters of axial piston pump technology. They specified their first APP pump in 2005 for a private water plant on Lopez Island in the San Juan archipelago in Washington state and installed it in 2006. More than a decade later, the pump is still running without any maintenance whatsoever. The same plant now supplies a small community water system serving several adjacent properties.
Watec purchased its first Danfoss pump, an APP 7.2, in 2005. It completed construction of the 12 gallon-per-minute plant in 2006. “It was our first APP plant,” says Evers, “and it was a pioneering project back then – for us, the client and for the region. We designed and built everything on our own, and are happy to say the original design and components have stood the test of time quite well.”
Since the installation was completed in 2006 it has evolved from a single-property plant into a small community water system that supplies surrounding properties as well. “The plant has produced several million gallons a year for many years now, and we have not touched the pump once for maintenance,” says Evers. “It looks and acts brand new. Unlike other pumps that
have run that many hours, it still performs without any leakage or pressure drops.” Evers credits the APP’s low pulsation for reducing maintenance of the rest of the plant. “The smoothness of this pump at different speeds is amazing,” he says. “There is no hammering at all. Increasing and decreasing pressure gradually is a lot easier on the rest of the plant, too, and we expect to get 10-15 years out of our membranes. Low maintenance costs alongside very low energy costs have meant extremely competitive total costs of ownership for the plant.”
