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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One can also use the appropriate value of K S to size the mist extractor in the vessel. This is typically characterized by a K S —value, as shown in Equation 2. Mist extractor manufacturer’s recommended minimum distances upstream 12i downstream of the wire mesh between gas inlet and outlet nozzles should be provided for full utilization of the mist extractor.

Want more content like this? Each segment was fitted to a linear equation in the form of Equation 7 and its regressed coefficients e and f are presented in Tables 3A and 3B for FPS and SI units, respectively.

Most mist extractors have limitations on the amount of entrained liquid droplets that can be efficiently removed from the gas, thus the importance of the gas gravity section to remove the liquids to an acceptable level upstream of the mist extractor.

This ensures that you are always up-to-date and saves you both time and money. This specification covers minimum requirements for the design, fabrication, and plant testing of oil and gas separators and oil-gas-water separators that are used in the 12n of oil and gas, and are located at some point on the producing flow line between the wellhead and pipeline.

Mist extractor capacity is defined by the gas velocity at which re-entrainment of the liquid collected in the device becomes appreciable. 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 effective length and actual lengths are calculated by Equation 5. The primary separation mechanism is liquid impingement onto the wires, followed by coalescence into droplets large enough to disengage from the mesh pad.

Assume vane-pack K S — value decline with pressure as shown in Table 5.

Once the maximum gas velocity, V Gmaxthrough the vessel is determined by Equation 2, one can calculate the minimum vessel diameter, D min by Equation 3. These parameters are approximate only. The K s method, Equation 2, is an empirical approach to estimate the maximum allowable gas velocity to achieve a desired droplet separation.

168710339 API 12J Spec for Oil and Gas Separators

In this TOTM, we will focus on the application of Souders-Brown approach in gas-liquid separators and present diagram, simple correlations and tables to estimate the Souders-Brown equation constant, K S the so called sizing parameter.

The drag force, F Dis exerted by flow of gas and gravity force, F Gis exerted by the weight of droplet. 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. For more information about these services, visit our website at http: Knowing the actual gas flow rate through the vessel, one can use K S parameter to determine the maximum allowable gas velocity through the vessel and determine the required separator diameter.

For practical applications, the first term on the right hand side is replaced by K S. If the calculated value of K SH by Equation 4 is greater than the maximum value of 0.

In the December tip of the month TOTM [1], we discussed troubleshooting of gas-liquid separators for removal of liquids from the gas stream leaving the separator. We will consider both vertical and horizontal gas-liquid separators.

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 zpi. Start Webshop Product catalog Product presentation.

Gas-Liquid Separators Sizing Parameter

There are several sources that one can look up the K S —values for different 12h. The curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns. These values are presented in Table 1. Sizing of three-phase gas-liquid hydrocarbon-liquid water separators are more complicated and will be discussed in another TOTM.


Table 4 provides a summary of mesh pad characteristics and performance parameters.

K S as a function of pressure and liquid droplet size for vertical separators with no mist extractor devices [5]. PetroSkills offers consulting 200 on this 208 and many others. The performance of a gas-liquid separator is highly dependent on the value of K S ; therefore, the choice of appropriate K S —values is important.

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Gas-Liquid Separators Sizing Parameter

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Table 6 provides vane pack xpi characteristics [3, 5, 8]. This is particularly important for separators handling higher liquid loads. 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. Subscription – always available and updated A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.

The two curves for micron droplet size in Figure 2 were divided into 4 and 2 segments based on pressure range for the lower and upper curves, respectively. In the following sections, we will apii three sources. Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter. For scrubber applications with apii liquid loadings, the K S —values will be primarily dependent 208 the mist extractor type, and the gas gravity separation section becomes less important.

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