By definition, every particle of the D100 size or coarser will be discarded. b. In practice some portion of solids finer than 172µ may be removed.
The API Screen Number is a single number which defines solids separation potential under specific test conditions. It does NOT define how a screen will operate on a shaker in the field as this will depend upon several other parameters such as fluid type & properties, shaker design, operating parameters, ROP, bit type, etc.
The API Screen Number corresponds to the API defined range of sizes into which the D100 value falls.
a. The D100 cut point of a screen is the particle size at which no particles will pass through the screen. b. D100 is a single number determined from a prescribed laboratory procedure – the results of the procedure should yield the same value for any given screen. c. The D100 should not be compared [...]
The non-blanked area of a screen describes the net unblocked area in square feet (ft²) or square meters (m²) available to permit the passage of fluid.
Conductance, measured in kilodarcies per millimeter (kD/mm), defines a Newtonian fluid’s ability to flow through a unit area of screen in a laminar flow regime under prescribed test conditions. All other factors being equal the screen with the higher conductance number should process more flow.
The D100 cut point of a screen is the particle size at which no particles will pass through the screen.
The D50 cut point of a screen is the particle size at which half of those particles reporting to the screen will pass through the screen and half will be retained.
Mesh, as it relates to a piece of woven wirecloth, is a measure of the number of holes in a linear inch (such as 100 mesh) or in a linear inch in each direction (such as 100 x 60 mesh).
API Screen Number is determined using a specific test procedure (asset out in API RP 13C).The test a specifically graded sample of Aluminum Oxide which is passed through a stack of sieves including the test sieve and mounted on a Tyler Ro-Tap®. The method determines the D100 cut point of the test screen and relates [...]