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  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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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. Assume vane-pack K S — value decline with pressure as shown in Table 5. The drag force acts to entrain the liquid droplet while the gravity force acts to pull it down and separating it from the gas phase.
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. Mesh pad K S deration factors as a function of pressure . The agreement lasts for three years, and the fee is charged once per year. The curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns.
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. This product can only be purchased electronically by customers who have a web subscription agreement. The drag force, F Dis exerted by flow of gas and gravity force, F Gis exerted by the weight of droplet. K S as a function of pressure and liquid droplet size for vertical separators with no mist extractor devices .
Gas-Liquid Separators Sizing Parameter
This dependency of K S on pressure and droplet size is presented in Figure 2 . There are apii methods for sizing gas-liquid separators: 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 production of oil and gas, 208 are located at some point on the producing flow line pai the wellhead and pipeline. References  provide mesh pad examples.
The mist extractor is the final gas cleaning device in a conventional separator. For practical applications, the first term on the right hand side is replaced by K S. The design parameter, K Sin the Souders-Brown equation is an empirical parameter and is a key factor for the 200 the gas-liquid separators vessel diameter as well as for determination of the mist extractor diameter.
Vane packs, like mesh pads, capture droplets primarily by inertial impaction. If you need to be able to add standards to the monitoring service, you must register as a user with your own username and password. 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.
This is typically characterized by a K S —value, as shown in Equation 2. The vane-pack manufacturer should be contacted for specific information. 21j of the horizontal separators are more complicated. References  provide the details on the droplet settling theory methods which can be used to more accurately quantify separator performance. Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter.
Table 5 was originally developed for mesh pads, but is used as an approximation for other mist extractor types. The maximum allowable superficial 12jj or other design criteria should be considered for other type mist extractor.
168710339 API 12J Spec for Oil and Gas Separators
These values are presented in Table 1. Mesh pads K S and performance parameters [3, 5, 8] Notes: 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. In the December tip of the month TOTM , we discussed troubleshooting of gas-liquid separators for removal of liquids from the gas stream leaving the separator.
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. 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.
You need to log in before adding standards to the monitoring service. One can also use the appropriate value of K S to size the mist extractor in the vessel. Therefore, the maximum gas velocity which prevents entrainment of liquid is obtained. 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 .
The effective length and actual lengths are calculated by Equation 5. 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. Table 4 provides a summary of mesh pad characteristics and performance parameters.
API Spec 12J
Droplet settling theory method, 2. This rate should allow all liquid droplets larger than 10 microns to settle out of the gas. Table 6 provides vane pack performance characteristics [3, 5, 8]. This ensures that you are always up-to-date and saves you both time and money. The Souders-Brown method 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.
A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition. The primary separation mechanism is liquid impingement onto the wires, followed by coalescence into droplets large enough to disengage from the mesh pad.
The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email. 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.
Read more about subscriptions. The selection, and 20008 to a large degree, determine the amount of liquid carryover remaining in the gas phase. Xpi 2 is called Souders-Brown  equation and K S is referred to as the design or sizing parameter.
The K s method, Equation 2, is an empirical approach to estimate the maximum allowable gas velocity to achieve a desired droplet separation.
Want more content like this? The horizontal separator sizing is a trial-and-error procedure. Figure 4 shows the location and function of a typical mist extractor in a vertical separator.