Clarifiers and Screens

Clarifiers and screens are used to remove solids from liquids through gravity settling or mechanical screening processes. Wastewater clarifiers are also used for clarification of bio-solids prior to discharge to the fields. Clarifiers and screens perform primary functions in wastewater treatment systems. Treatment equipment such as clarifiers and screens, comminutors, and grit chambers are used as wastewater first enters the treatment plant. API separators are used in the treatment of refinery wastewater that has been contaminated by oil and oil-bearing sludge. In an API separator, wastewater is collected in a pretreatment section that allows sludge removal, and then further treatment processes are used to more completely remove entrained oil in all forms. API is an acronym for the American Petroleum Institute.

Water clarifiers, similar to clarifiers and screens, assist in optimizing a treating system by improving efficiency and helping to purify produced water to meet effluent water specifications. A water clarifier consist of special blends of polymers, coagulants, surfactants, and metal salts which work in conjunction with process systems to remove oil and water soluble organics (WSOs) from the water. These types of clarifiers and screens reduce the turbidity or cloudiness of the water and remove particulate matter that could plug up down-hole production or disposal formations. Oil/water separators (OWS) are specialty tanks designed to separate free oil, grease and settleable solids from water. After separation, clean water is discharged to a storm sewer, while the separated oil is retained in the tank for proper disposal at a later time. Oil/water separator applications are generally for rainwater runoff and equipment wash downs.

With clarifiers and screens, close tolerance tubing provides excellent flow properties and is ideal for operations requiring precise transfer levels. Tubing manufactured to meet very close dimensional tolerances is measured as it is being extruded to ensure it remains within the specified dimensions. In order to achieve tubing close tolerance not obtainable from production type tube mills, custom tubing is made by a number of different processes, such as gun drilling or trepanning from solid bar stock, to achieve closer tolerances and better finishes.

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