API Sand : Solid particles in a drilling fluid that are too large to pass through a U.S.S. No. 200 screen (74 micron equivalent). See: API RP 13B. (Bul 13C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}