Case study 01/2011 ©2011 PAX Water Technologies, Inc. 1 Standpipes are one of the most problematic tank geometries to mix. Inlet velocities are typically small in magnitude and horizontal in direction. The substantial majority of water in the standpipe must remain in the tank to produce and maintain pressure head in the distribution system, so there is often a hard limit (typically 70-90 percent of capacity) below which the operators canno

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