Api Oil Water Separator Sizing

Oil water separators are typically the american petroleum institute api also called baffle type american petroleum institute 1990 or the coalescing plate cp type using a gravity mechanism for separation.

Api oil water separator sizing.

The name is derived from the fact that such separators are designed according to standards published by the american petroleum. 0 9860 density of the water s g g cm3 0 0052 viscosity in poise 1 2568 rise rate of oil droplet gpm ft2 calculated 159 13 horizontal surface area area ft2 of the separator needed to achieve desired oil removal performance 0 89 cross sectional velocity ft min. Oil water separator sizing calculation. This guide is intended to assist knowledgeable personnel with sizing a highland tank oil water separator.

Sizing ows calculation per api 421 xls author. 8 16 2016 5 28 46 pm. Oil water separators typically consist of three bays. Oil droplets from 20 to 150 microns in diameter.

Oil droplets 150 microns in diameter and larger. When sizing an ows there are three primary factors to consider. This correlates to a tank size that can be 5 times the size of an equally sized coalescing separator. 33 1 2 types of separator api tanks see figure 33 1 and plate separators are the more efficient oil separators.

The spreadsheet operates on microsoft excel 2003 or later. The api type design relies on a large water volume. An api oil water separator is a device designed to separate gross amounts of oil and suspended solids from the wastewater effluents of oil refineries petrochemical plants chemical plants natural gas processing plants and other industrial oily water sources. Oil water separator oil droplet sizes definitions and meanings.

This calculation is based on the methods proposed. Must be 3fpm note. Api tanks were originally designed by the american petroleum institute api for use in refinery applications but modifications of the design can be used for stormwater treatment. This correlates to a tank size that can be 5 times the size of an equally sized coalescing separator.

Following are the definitions and categories of different oil droplet sizes as defined by the american petroleum institute in the mid 1970 s. Forebay separator section and the. See figure 5 33 and figure 5 34. This design also known as an api separator generally provides a discharge oil concentration of 100 ppm based on a 150 micron droplet size.

This design also known as an api separator generally provides a discharge oil concentration of 100 ppm based on a 150 micron droplet size. The api type design relies on a large water volume. Individual projects must be evaluated to determine the appropriate size and configuration for that site. By inputting the major design criteria you can solve for the separation chambers width to length to depth ratios.