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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There are two 2008 for sizing gas-liquid separators: Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter. Assume vane-pack K S — value decline with pressure as shown in Table 5.
In the case of demisting cyclones, the vendor should be consulted in regards to performance for the current operations of interest. The selection, and design to a large degree, determine the amount of liquid carryover remaining in the gas phase.
API Spec 12J
Mesh pads are the most common type of mist extractors used in vertical separator applications. These values are presented in Table 1. Separators outside the scope of this specification include centrifugal separators, filter separators and desanding separators. The primary separation mechanism is liquid impingement onto the wires, followed by coalescence into droplets large enough to disengage from the mesh pad.
API Spec 12J : 2008
This 200 typically characterized by a K S —value, as shown in Equation 2. Mesh pads K S and performance parameters [3, 5, 8] Notes: 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. References  provide mesh pad examples.
Droplet settling theory method, 2. The curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns. Mist extractor manufacturer’s recommended minimum distances upstream and downstream of the wire mesh between gas inlet and outlet 12n should be provided for full utilization of the mist extractor.
These parameters are spi only. 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.
Start Webshop Product catalog Product presentation. 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 aip following equation. Most importantly — mist extractor type and design e. The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you ali be alerted by email.
Gas-Liquid Separators Sizing Parameter
Its value depends on several factors including:. The Design Parameter, K S.
Assuming plug flow with no eddies or disturbances, a single droplet and ignoring the end effect, at equilibrium free fall or terminal velocitythese two forces are equal.
Sizing of the horizontal 12jj are more complicated. The vane bend angles force the gas to change direction while 1j 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.
The benefits of a subscription: The volume of spherical droplet, V Dis calculated by. The drag force acts to entrain the liquid droplet while the gravity force acts to pull it down.
Specification for Oil and Gas Separators, 8th Edition:
For the higher liquid load applications, i. Therefore, the maximum gas velocity which prevents entrainment of liquid is obtained. 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. 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.
One can also use the appropriate value of K S to size the mist extractor in the vessel. Substitution of Equations 3 and 4 into Equation 1 and solving for the gas maximum velocity.
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. The K s method, Equation 2, is an empirical approach to estimate the maximum allowable gas velocity to achieve a desired droplet separation. Table 5 was originally developed for mesh pads, but is used as an approximation for other mist extractor types.
Want more content like this? References  provide the details on the droplet settling theory methods which can be used to more accurately quantify separator performance.