The selection of shaker screens to meet different operational condition

July 28, 2012 - PRLog -- Screening Surface: Screening surfaces used in solids control equipment are generally made of woven wire screen cloth, in many different sizes and shapes. The following characteristics of screen cloth are important in solids applications.

Screens may be constructed with one or more layers. Non-layered screens have a single screen cloth mounted in a screen panel. These screens will have openings that are regular in size and shape. Layered screens have two or more screen cloths, usually of different mesh, mounted in a screen panel. These screens will have openings that vary greatly in size & shape.

Mesh is defined as the number of openings per linear inch. Mesh, can be measured by starting at the center of one wire and counting the number of openings to a point one inch away.

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Size of openings: is the distance between wires in the screen cloth & is usually measured in fractions of an inch or microns.
Screens of the same mesh may have different sized openings depending on the diameter of the wire used to weave the screen cloth.
The smaller the diameter of the wire results in larger screen openings allowing larger particles to pass through the screen. The larger the diameter of the wire, the smaller the particles that will pass through the screen

But Remember: It is the size of the opening in a screen not the mesh count that determines the size of the particles separated by the screen.
Percent of area: is the amount of the screen surface, which is not blocked by wire. The greater the wire diameter of a given mesh screen, the less open space between the wires. For example; a 4 mesh screen made of thin wire has a greater percent of opening than a 4 mesh screen made of thick wire.

The purpose of vibrating the screen in solids control is to tumble the solids particles to separate fluids from solids and increase through put capacity. This vibrating action causes rapid separation of whole mud from the oversize solids, reducing the amount of mud lost with the solids.

For maximum efficiency, the solids on the screen surface must travel in a predetermined pattern. For example; some devices use elliptical motion and others use Linear motion to increase efficiency. The combined effect of the screen and vibration result in the separation and removal of oversized particles from drilling mud.


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