basic sediment and water
basic sediment and water[′bā·sik ′sed·ə·mənt ən ′wȯd·ər]
Oil, water, and foreign matter that collects in the bottom of petroleum storage tanks. Abbreviated BS&W. Also known as bottoms; bottom sediment; bottom settlings; sediment and water.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.