Arashit 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.
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Nar 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. In the case of demisting cyclones, the vendor should be consulted in regards to performance for the current operations of interest.
The drag force, F Dis exerted by flow of gas and gravity force, F G 12u, is exerted by the weight of droplet.
The moment new editions of the standards you monitor are released, changes are made, or appendixes are published, you will be alerted by email. PetroSkills offers consulting expertise on this subject and many others. Substitution of Equations 3 ap 4 into Equation 1 and solving for the gas maximum In the following sections, we will discuss three sources. Its value depends on several factors including:.
Assume mesh pad K S — value decline with pressure as shown in Table 5. Most importantly — mist extractor type and design e. This is particularly important for separators handling higher liquid loads. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.
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. The curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns.
The K s method, Equation 2, is an empirical approach to estimate the maximum apii gas velocity to achieve a desired droplet separation. This service is not available if you are a URL user where you do not log in with an email address. You need to log in before adding standards to the monitoring service.
The Design Zpi, K S. Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter. Note for each droplet size a range of K S —values are given for a specified pressure. 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 12 sizing parameter.
The primary separation mechanism is liquid impingement onto the wires, followed by coalescence into droplets large enough to disengage from the mesh pad.
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. Apj volume of spherical droplet, V Dis calculated by.
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. Gas-Liquid Separators Sizing Parameter The benefits of a subscription: For more information about these services, visit our website at http: The drag force acts to entrain the liquid droplet while the gravity force acts to pull it down. Mesh pad K S deration factors as a function of pressure .
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. We will consider both vertical and horizontal gas-liquid separators. 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.
Fenricage This is typically characterized by a K S —value, as shown in Equation 2. 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. This product can only be purchased electronically by customers who have a web subscription agreement. The benefits of a subscription: Equation 6 is called Souder-Brown equation and K S is referred to as the design parameter.
API SPEC 12J
Grokree You need to log in before adding standards to the monitoring service. K S as a function of pressure and liquid droplet size for vertical separators with no mist extractor devices . The Design Parameter, K S. 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. Mesh pad K S deration factors as a function of pressure . The benefits of a subscription: 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.
For vertical separators with no mist extractor devices, Chap 11, Vol 2 of the Gas Conditioning Processing book presents K S as a function of pressure and liquid droplet size . 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. API Spec 12J : The curves for different droplet sizes shown in Figure 2 are fitted to a 3 rd order polynomial for droplet sizes of, and microns. 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. This is typically characterized by a K S —value, as shown in Equation 2.
API 12J 2008 PDF
Yozshutaxe Note for each droplet size a range of K S —values are given for a specified pressure. 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. The primary separation mechanism is liquid impingement onto the wires, followed by coalescence into droplets large enough to disengage from the mesh pad. 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 benefits of a subscription: These parameters are approximate only.