Facts & Figures Book - KPI-JCI

Washin g/Classifyin gGPM column may also be extended to any other unitdesired; e.g., cubic feet per second.NOTE:1) The equation is based on U.S. Gallon and std. (short) ton of2,000 lbs.2) The difference in result by using 2.65 or 2.70 SG Solids isnegligible compared to the inaccuracy usually inherent ingiven quantities.3) For sea water, use SG 1.026. In this case, the difference isappreciable.CONVERSION FACTORSTo Obtain Multiply By Based OnTPH Cu. Yd/Hr. 1.35 Sand 100#/cu. ft., dry.Short TPH Long TPH 1.12 2240 lb. tonShort TPH Metric TPH 1.1023 Kilo = 2.2046 lb.U.S. GPM British GPM 1.201U.S. GPM Cu. Ft./Min. 7.48U.S. GPM Cu. Ft./Sec. 448.5The third consideration is that of viscosity. Viscosity canbe compared to friction in that it is a resistance to movementbetween liquid particles and between solid andliquid particles.In a continuous process, such as in the production of fineaggregates, the slurry flows into and out of the classifyingtank at a measurable rate, which determines its velocityof flow through the tank. The solids settle out, due totheir weight, at a speed that is expressed as rate of fallor settling. It is the interrelationship between these twomovements which governs the path of the falling particle.FEEDOVERFLOWDABCDEDIAGRAM OF FORCESVOGLALBLCLDLEHORIZONTAL TRAVEL OF FALLINGSAND PARTICLESPATH OF PARTICLESettling From A Surface CurrentIn the figure above, directions of the current and of the free fall of the particle are atright angles. The actual path of a falling particle is a parabola; the height of fall (D)and the length of horizontal travel (L) are determined by use of well-known formula.This is called settling from a surface current.116