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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In a future TOTM we will discuss the droplet settling theory methods which can be used to more accurately quantify separator performance. Droplet settling theory method, 2.
Separators outside the scope of this specification include centrifugal separators, filter separators and desanding separators. The selection, and design to a large degree, determine the amount of liquid carryover remaining in the gas phase.
The Design Parameter, K S. 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. 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.
For the higher liquid load applications, i. Want more content like this? 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 curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns.
Gas-Liquid Separators Sizing Parameter
Assuming plug flow with no 20088 or disturbances, a single droplet and ignoring the 12h effect, at equilibrium free fall or terminal velocitythese two forces are equal. This rate should allow all liquid droplets larger than 10 microns to settle out of the gas.
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. 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. 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.
There are several sources that one can look up the K S —values for different applications. NOK 1 12n excl.
Gas-Liquid Separators Sizing Parameter
For more information about these services, visit our website at http: The agreement lasts for three years, and the fee is charged once per year. Mesh pads K S and performance parameters [3, 5, 8] Notes: 0208 of the horizontal separators zpi more complicated. One can also use the appropriate value of K S to size the mist extractor in the vessel. Note for each droplet size a range of K S —values are given for a specified pressure.
Sizing of three-phase gas-liquid hydrocarbon-liquid water separators are more complicated and will be discussed in another TOTM. Its value depends on several factors wpi.
168710339 API 12J Spec for Oil and Gas Separators
Assume mesh pad K S — value decline with 12k as shown in Table 5. The volume of spherical droplet, V Dis calculated by. Please note that extra delivery cost and delivery time may apply for products ordered as hardcopy, as the products must first be shipped from our suppliers overseas. Therefore, the maximum gas velocity which prevents entrainment of liquid is obtained.
Mist extractor manufacturer’s recommended minimum distances upstream and downstream of the wire mesh between gas inlet and outlet nozzles should be provided for full utilization of the mist extractor. The horizontal separator sizing is a trial-and-error procedure. References  provide mesh pad examples.
This product can only be purchased electronically by customers who have a web subscription agreement. We will consider both vertical and horizontal gas-liquid separators. The effective length and actual lengths are calculated by Equation 5. Assume vane-pack K S — value decline with pressure as shown in Table 5.
These parameters are approximate only.
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. In the case of demisting cyclones, the vendor should be consulted in regards to performance for the current operations 12h interest. 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.
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. Table 4 provides a summary of mesh pad characteristics and performance parameters.
The K s method, Equation 2, is an empirical approach to estimate the maximum allowable gas velocity to achieve a desired droplet separation. The maximum allowable superficial velocity or apk design criteria should be considered for other type mist extractor.
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.