In general terms, harp screens will screen at double the rate of the equivalent aperture woven wire. They are used for difficult-to-screen materials, where blinding and pegging make screening with square mesh difficult.
Harp screens increase productivity. They make screening of sticky and damp materials possible, where screening with a woven mesh would be impossible.
Why harp screens work;
· Increased open area, up to 90 percent
· No cross wires, therefore no corners for fines to build from
· Smaller diameter wires than mesh, so less surface area for fines to adhere to
Advantages of Harp Screens
When compared to conventional slotted pipe, wedge wire screen flat have superior open area due to their continuous slot openings. The benefits of which will :
•Reduce energy consumption and increase water flow.
•Reduce erosion of entry surfaces and increase well life.
•Allow a uniform and efficient well development.
•Reduce significantly potential pump damage and subsequent maintenance costs.
Uses of Harp Screens
It can use with the deep well pump, dive the water pump, also may use in the water-treating equipment, the environmental protection, the sea water transforms into the industrial water and life use water desalination treatment, running water treatment, water softening treatment, the petroleum industry: The petroleum product terminal filters and the chemical acid, the alkali liquid filters, the ethyl alcohol and so on the organic solution recycling filters.
Until now harp screens have been only available on mobile screening plants. Now, with the introduction of Symphony Wire’s Cross Harp, harp screens can now be fitted to any side-tensioned vibrating screen, without modification to the screen body.
A cross harp wire screen (piano screen) is made up of single strands of straight, highly tensioned wire, connected at either end of the screen with a sheet metal hook. Spacer strips sit over the top of capping rubbers to maintain correct aperture. This produces a long, uninterrupted slot between the capping rubbers.