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Revised API Designation System API RP 13C (ISO 13501)
Shale shaker screens made of two or three layers of screen cloth of different mesh sizes present openings that cannot be easily characterized. A technique to describe these openings has been adopted by the API as the ‘‘Recommended Practice for Designations of Shale Shaker Screens,’’ API RP 13C. This recommended practice supersedes the second edition (1985) of API RP 13E, which was valid for only single-layer screens.

The new designation system was chosen to convey information on screen opening size distribution and the ability of non-vibrating screens to pass fluid. Information for each of the following is legibly stamped on a tag attached to the screen panel in such a way as to be visible after the screen is installed on the shale shaker:

Manufacturer’s designation
API number

The ‘‘mesh’’ designation is now called an API number so that the new designation will be more rig-user friendly. Rig crews recognize ‘‘mesh size’’ even though they may not actually know the definition. The change is necessary, since the API Recommended Practices were converted to International Standards Organization (ISO 13501).

Fluid Systems is pleased to announce availability of API RP 13C (ISO 13501) compliant shaker screens. Compliance means that Fluid Systems screens meet the American Petroleum Institute’s (API) new recommended practice for shaker screen testing and labeling.
Screen Panels Product Catalog
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