API 12J 2008 PDF

API Spec 12J. Specification for Oil and Gas Separators, Eighth Edition. standard by American Petroleum Institute, 10/01/ View all product details. Find the most up-to-date version of API SPEC 12J at Engineering Organization: API. Publication Date: 1 October Status: active. Page Count: The API 12J [7] recommends ranges of KS –values for vertical and horizontal gas -liquid separators. Per API 12J, “the maximum allowable superficial velocity, calculated form the above factors, is .. October, 8. PF

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This is typically characterized by a K S —value, as shown in Equation 2. Historically the Souders-Brown equation has been employed as it can provide reasonable results and is easy to use, but has shortcomings in terms of quantifying separator performance. This product can only be purchased electronically by customers who have a web subscription agreement. The benefits of a subscription: Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter.

Table 6 provides vane pack performance characteristics [3, 5, 8]. NOK 1 ,00 excl. Once the maximum, V Gmaxgas velocity through the vessel is determined by Equation 6, one can calculate the required minimum cross sectional area of vessel for gas flow by the following equation.

API 12J Spec for Oil and Gas Separators – PDF Free Download

The horizontal separator sizing is a trial-and-error procedure. There are two methods for sizing gas-liquid separators: Separators covered by this specification may be vertical, spherical, or single or double barrel horizontal.


The vane-pack manufacturer should be contacted for specific information. Once the maximum gas velocity, V Gmaxthrough the vessel is determined by Equation 2, apk can calculate the minimum vessel diameter, D min by Equation 3.

As presented in the Appendix, substitution of expressions for the drag and gravity forces in Equation 1, the maximum allowable gas velocity, V Gmaxwhich prevents entrainment of liquid is obtained. The K s method, Equation 2, is an empirical approach to estimate the maximum allowable gas velocity to achieve a desired droplet separation.

The design parameter, K Sin the Souders-Brown equation is an empirical parameter and is a key factor for the sizing the gas-liquid separators vessel diameter as well as for determination of the mist extractor diameter. The SBA is limited in that it is based on the average droplet size, but cannot quantify the amount of liquid droplets exiting the gas gravity section and mist extractor section.

These spi are approximate only. The drag force, F Dis exerted by flow of gas and gravity force, F Gis exerted by the weight of droplet. For more information about these services, visit our website at http: Monitoring Standards monitoring is a free service designed for you who wish to be alerted of changes to or new editions of the standards required in your work.

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We will consider both vertical and horizontal gas-liquid separators. The vane bend angles force the gas to change direction while the higher density liquid droplets tend to travel in a straight-line path, and impact the surface of the vane where they are collected and removed from the gas flow.


K S as a function of pressure and liquid droplet size for vertical separators with no mist extractor devices [5]. If we consider a spherical liquid droplet with a diameter of D P in the gas phase two forces as shown in Figure 1 act on it.

Gas-Liquid Separators Sizing Parameter

In the following sections, we will discuss three sources. For the higher liquid load applications, i. The volume of spherical droplet, V Dis calculated by.

Most importantly — mist extractor type and design e. If we consider a spherical liquid droplet with a diameter of, D Pin the gas phase two forces as shown in Figure 1 act on it. Mesh pad K Apii deration factors as a function of pressure [5].

Gas-Liquid Separators Sizing Parameter

Mist extractor capacity is defined by the gas velocity at which re-entrainment of the liquid collected in the device becomes appreciable. Sizing of the horizontal separators are more complicated. For vertical separators with no mist extractor devices, Chap 11, Vol 2 of the Gas Conditioning and Processing book presents K S as a function of pressure and liquid droplet size [5]. You need to log in before adding standards to the monitoring service. The Design Parameter, K S.