Abstract: A chemical mixing method to safely mix a dry chemical into a solution provides a mixing process with high levels of precision and accuracy. Water may be pumped into a mixing tank through a Venturi tube, which creates a vacuum that may be used to withdraw the dry chemical from the shipping container. The eductor system including the Venturi tube may be thoroughly flushed before the mixing process is finalized, and the effluent from the flushing procedure may be pumped to the mixing tank to recover all measured dry chemical and water.

Abstract: A ball valve with a purging mechanism is used in a method that provides a fluid purge of the valve. The fluid purge may be accomplished by introducing fluid into a housing of the valve and allowing the fluid to pass through the valve and out through an outlet port. The fluid purge eliminates any residual matter from a liquid flow line. The fluid used for the purge is typically nitrogen or clean dry air (CDA).

Abstract: A liquid contaminant separation system that includes a liquid surface skimmer having an interior with a wall perimeter sealed by a vertically sliding float. The float has a tubular body with slots in the tube wall, and a vortex cavity in an upper section thereof. The structure of the float provides for flow of liquid from a supply reservoir through the slots in the float wall, over a top edge of the float into the vortex cavity, and then down into the collection reservoir of the float. The float level is determined by the level of liquid in the collection reservoir. Vertical slots in the wall of the collection reservoir extend above the level of liquid in the supply reservoir. The float body must be sufficiently iong so that lower ends of the slots are blocked by the float body. This ensures that liquid from the supply reservoir will flow into the float only at the top edge of the float, thereby enabling the system to effectively separate the desired liquid from the contaminating liquid.