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API RP 13C Explanation

API RP13C includes a number of subjects relating to fluids treatment systems. When it comes to shale shaker screen, it only apply to screen testing (cut point and conductance), classification and labeling.


1. What does the API Screen Number tell us?

The API Screen Number corresponds to the API defined range of sizes into which the D100 value falls.


2. What does the API Screen Number NOT tell us?

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 when actual use it, as this depends on several other factors such as fluid type & properties, shaker design, operating parameters, ROP, bit type, etc.


3. Can a screen with a D100 of 172μ remove solids finer than 172μ?

Theoretically every particle of the D100 size or coarser will be discarded. In practice, parts of solids finer than 172μ may be removed.


4. Should I use the old screen number or the new API Screen Number when ordering screens for replacement?

As most of companies are changing their part numbers to show their conformance to RP13C, we think it is better to specify the RP13C value you want.


5. Should I change a finer screen now if what used to be called “ 200 mesh screen” is now labeled as “ API 120” ?

We advise you choose the screens that work best in the applications regardless of what the new API Screen Number happens to be.


6. What is the practical value of RP13C to the end user?

RP13C provides an unequivocal procedure and benchmark for comparing different screens. While the primary intent of RP13C is to provide a standard measuring system for screens.



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