Thermoplastics pumps suppliers have launched a new weatherable solar-powered chemical dosing system that features a non-metallic, peristaltic pump for the corrosion-free transfer of caustic and acidic treatment chemicals from an integral thermoplastic storage tank to water and wastewater containment facilities in remote locations.
The pump, Flex-I-Liner model 12, uses a rotor mounted on an eccentric shaft to push fluid trapped between a flexible elastomer liner and a solid plastic body block. The self-priming design means that there are no seals to leak, or valves to clog, and the pump can run dry without damage.
The rigid body block is moulded from solid polypropy- lene, ultrahigh-molecular-weight polyethylene or polytetrafluoro-ethylene, while the flexible liner, made from natural rubber, is moulded from neoprene, Hypalon, Viton or Nordel, eliminating corrosion associated with pumps constructed from stain-less steel and high alloys. This also prevents wicking and delamination associated with fibreglass and plastic-lined metals, says the company.
It is designed to meter a fixed volume of liquid over user-programmed time intervals. A throttling valve on the suction line to the pump allows for flow rate adjustment.

2011-03-21

Back