What is API Screen Number?

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 it to the D100  of an ‘equivalent’ standard ASTM test sieve.

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