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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Gas-Liquid Separators Sizing Parameter

NOK 1 ,00 excl. The horizontal separator sizing is a trial-and-error procedure. For the higher liquid load applications, i. Mesh pads K S and performance parameters [3, 5, 8] Notes: For more information about such agreements, or product availability as hardcopy, please contact us by phone 67 83 87 00 or email salg standard. Substitution of Equations 3 and 4 into Equation 1 and solving for the gas maximum velocity.

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.

The curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns. This is particularly important for separators handling higher liquid loads.

The maximum xpi superficial velocity or other design criteria should be considered for other type mist extractor. In the case of demisting cyclones, the vendor should be consulted in regards to performance for the current operations of interest.

Want more content like this? Start Webshop Product catalog Product presentation. 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.

The mist extractor is the final gas cleaning device in a conventional separator.


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

The effective pai and actual lengths are calculated by Equation 5. For horizontal separators, the sizing depends on in addition to the droplet size, density of gas and liquid phases, and gas velocity separator effective length, L eand the depth available for gas flow, h Gi.

The drag force, F Dis exerted by flow of gas and gravity force, F Gis exerted by weight of droplet. The drag force, F Dis exerted by flow of gas and gravity force, F Gis exerted by the weight spi droplet.

Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter. These values are presented in Table 1.

API Spec 12J : 2008

K 12jj as a function of pressure and liquid droplet size for vertical separators with no mist extractor devices [5]. Its value depends on several factors including:.

For scrubber applications with low liquid loadings, the K S —values will be primarily dependent on the mist extractor type, and the gas gravity separation section becomes less important.

The last row of Table 2 provides the average absolute percent deviation AAPD of the predicted K S by zpi proposed correlation from the 200 values of Figure 2 values. References [] provide mesh pad examples. The benefits of a subscription: The selection, and design to a large degree, determine the amount of liquid carryover remaining in the gas phase.

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. Table 5 was originally developed for mesh pads, but is used as an approximation for other mist extractor types. 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.

Once the maximum, V Gmaxgas velocity through the vessel is determined by Equation 6, one can calculate the required minimum cross sectional area of appi for gas flow by the following equation. The Design Parameter, K S. Knowing the actual gas aoi 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.


These parameters are aip only. 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.

Specification for Oil and Gas Separators, 8th Edition:

Mist extractor manufacturer’s recommended minimum distances upstream and downstream of the wire mesh between gas inlet and outlet 12 should be provided for full utilization of the mist extractor. Mesh pads are the most common type of mist extractors used in vertical separator applications. Sizing of three-phase gas-liquid hydrocarbon-liquid water separators are more complicated and will be discussed in another TOTM.

Most importantly — mist extractor type and design e.

For more information about these services, visit our website at http: There are several sources that one can look up the K S —values for different applications. 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 aoi the mist extractor diameter.

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We will consider both vertical and horizontal gas-liquid separators. Therefore, the maximum gas velocity which prevents entrainment of liquid is obtained. The agreement lasts for three years, and the fee is charged once per year. 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.

For detail of calculations procedure refer to chapter 11 of reference [5].