API Oil Water Separator

API oil water separator is a gravity-based separation system. It is designed as per API 421using Stokes’s Law. The specific gravity difference leads to the settlement of heavier solids at the bottom of the separator. Oil rises to form the top layer; heavy suspended particles from the bottom layer and the middle layer are formed by water. The top oil layer is skimmed off using a chain scraper system, slotted pipe skimmer, or a rotary skimmer. The bottom sediment layer is removed by chain and scraper arrangement (or similar device). Dimensions of API pits are specifically designed to ensure oil molecules reach the top surface of fluid before reaching the end of the pit.

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API Oil Water Separator Overview

Our API 421 oil water separator is designed to separate oil and water by means of gravity. It works on the principle of Stokes’s Law. The density difference separates oil and water whereas sludge settles at the bottom. It is highly efficient, easy to operate, and service.

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API Oil Water Separator Specifications

Flow rate

5 m3/h to 7500 m3/h

MOC of API tank

RCC/ MSEP

MOC of Skimmer Belt

SS304/ SS316/ MSEP


Capacity of Belt Skimmer

10 LPH to 500 LPH

MOC of Chain Scraper

SS304/ SS316/ Delrin/ UHMWPE/ MSEP

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Application areas of API Oil Water Separator

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Industries Using API Oil Water Separator