API-421
The API-421 uses a variety of innovative technology (such as velocity-Head Diffusers, Reaction-Jets, Flight Rake System, Corrugated Plate Packs, Oil-Skimming Devices, etc.) to remove oil from wastewater onshore.
API-421 SKIMMER
The ESI API-421 Separator is a gravity-type oil-water separator designed for use in petroleum refineries. Design criteria is based on the American Petroleum Institute's (API) Publication 421, "Design and Operation of Oil-Water Separators". Our API-421 Separator includes Diffusers, Reaction-Jets, Sludge Hopper, Flight & Rake System, Corrugated Plate Packs, Oil-Skimming Devices, etc. These internal components reduce flow turbulence, distribute the flow evenly, and help coalesce and remove the oil.
The following parameters are required for proper sizing and design:
| Qm = Design flow (maximum wastewater flow). T = Lowest wastewater temperature. Sw = Specific gravity of the wastewater. |
μ = Absolute/dynamic viscosity of the wastewater. So = Specific gravity of the oil-fraction. D = Diameter of the oil globule to be removed. |
Additional design constraints are as follows:
Vh = Horizontal Velocity should be ≤3ft/minute or 15x the oil globule rate of rise (Vt), whichever is smaller.
d = Separation Depth should be 3-8 feet.
Depth (separator) to width (separator) ratio should range from 0.3 to 0.5.
Separator width is usually 6-20 feet.
Two Channels are usually provided for servicing or cleaning one channel while the other is in service.
Length to width ratio (L/B) should be ≥5.
API-421 SEPARATOR PACKAGE INCLUDES
Engineered for Specific Application
Inlet Distribution System
Solids Collection and Removal
Oil Collection and Removal
Secondary Oil Removal with Optional Plate Pack