Control Valve Selection And Sizing Driskell Pdf

control valve selection and sizing driskell pdf

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Control Valve Selection and Sizing - Les Driskell

The tutorial is based on implementing three conventional PID control loops on a single-stage flash drum unit for a multicomponent, nonideal feed stream. The steps in the development process are: 1 2 3 4 5 6 7 steady-state design and simulation specifying dynamic characteristics of process equipment switching the simulation over to dynamics mode adding feedback controllers to the simulation adding stripchart displays carrying out dynamic tests and fitting transfer functions tuning the controllers.

Steady-state Design and SimulationThe process unit that is design, simulated and studied in this tutorial is a single-stage flash drum, as shown in the figure below. Vapor Outlet. The flash drum is to operate at atmospheric pressure, Pressure downstream of both vapor and liquid valves is 9. You may find it best to use this document on-line while you are completing the tutorial, opened in Acrobat Reader, rather than printing it out on a standard laser printer.

In that way, you can see the colors. The Simulation Basis Manager window will appear, and you click on the Add button to create a fluid package for the component set. Enter acetone into the Match field and click the Add Pure button. Do the same for 2-propanol and water. Click on the Add button, as shown above. The Fluid Package window appears with the Setup tab selected.

The NRTL non-random, two-liquid activity model is appropriate for our aqueous mixture. Click on the Close button and return to the Simulation Basis Manager.

Save the case as FlashDrumxyz instead of xyz, use your initials. Move the cursor to the left side of the PFD window, and you should see blue arrow labeled 1 should appear. The light blue color indicates that the stream needs to be specified, so double-click on the arrow. A stream specification window, labeled 1, should appear. Start by clicking on the 1 to the right of Stream Name, and then enter Feed in the field that appears. Once, you press the Enter key, Feed should now appear to the right of Stream Name and in the title bar of the window.

Next, click to the right of Temperature, and type 80 in the entry field up top. Notice that the default units are the desired units, C, so press Enter. Next, click to the right of Pressure and type 20 in the entry field. The default units, kPa, are not correct for the 20 entry, so open the units list to the right and select psia. Click on psia and the entry will be made, changing the display of the units to kPa and converting the numerical value to This should leave you with the following window now.

The rest of the quantities are still because the composition hasnt been specified yet. So, click on the Composition item on the left,. Make certain the Mass Fractions option button is selected and enter the feed specifications, [ 0.

As shown, click OK, and the Feed window should show the compositions, along with a green OK banner at the bottom. You can see additional estimated properties by clicking the Properties item. Close out the Feed window in the upper right corner. The stream arrow should now appear dark blue and with by clicking on the the title Feed. Now, you will add the feed valve. Click on the valve symbol on the palette to the right.

Move your cursor to the right of the Feed stream and click. You should see a red valve symbol there. Double-click on the VLV valve symbol and you will get a window. Click in the Name field and enter directly there a name Feed Valve. Open the Inlet drop-down list. There should be only one item, Feed. Click on it. In the Outlet field, type directly Drum Feed. The Feed Valve window is now complaining that it needs a pressure drop, Delta P. Eventually, this will be determined dynamically, but, for now, we can enter the steady state value, 5 psi.

So, click on the Parameters item on the left and enter a value of 5 psi. You will have to adjust the entry units to do this. The Feed Valve window shows about 35 kPa and the green OK at the bottom indicates that the window is.

Later, we will have to come happy and satisfied now, so close out the window by clicking on the back to size the valve for dynamic simulation purposes.

Now, you will add the major equipment component, the flash drum. Find the separator icon on the palette. The separator should appear in red. The Vapor and Liquid streams have been created automatically, and, for now, the Flash Drum window is happy as a clam at high tide as shown by the green banner with OK.

Well have to come back to it later it closed for now. As you go along, you can yank components on the PFD around to neaten things up, if youre one of those drive between the lines types.

Now, its a matter of installing the Vapor Valve and Liquid Valve, each with a 5 psi pressure drop and outputting to Vapor Outlet and Liquid Outlet streams. Based on your experience to this point, do that not much guidance provided here and your finished steady-state PFD should look like the figure below. To make sure you have everything correct and consistent, you can check the conditions and compositions of the to outlet streams3. These are shown below. Specifying Dynamic Characteristics of EquipmentThe steady-state material and energy balances for the flash drum process can be calculated without much of the process design being specified.

For example, the actual size of the flash drum only has bearing on the dynamic behavior of the unit. But the steady-state, nominal operating conditions can be used as a basis for the rest of the design. The flash drum is sized for a 5-minute hold-up at this flow rate. This requires an operating liquid volume of 1. This leads to the following vessel design. Double-click on the flash drum unit and select the Rating tab along the bottom of the window.

Enter the diameter as 1. This is shown below. Download for free Report this document. The steps in the development process are: 1 2 3 4 5 6 7 steady-state design and simulation specifying dynamic characteristics of process equipment switching the simulation over to dynamics mode adding feedback controllers to the simulation adding stripchart displays carrying out dynamic tests and fitting transfer functions tuning the controllers 1. Click the View button and the Component List View window will show.

Click once on the blue arrow for Material Stream on the palette to the right. Click there and a light The light blue color indicates that the stream needs to be specified, so double-click on the arrow. So, click on the Composition item on the left, and then on the Edit button. Your process flow diagram PFD should now look like. Find the separator icon on the palette and click on it. Double-click on the separator to get its window, and immediately change its name to Flash Drum.

Click on the item under Inlets, and select Drum Feed from the drop-down list above. This completes the steady-state simulation development. Make sure you save your case. Now click on the Dynamics tab and enter a Liquid Volume Pct value of This should look like Close the window by clicking on the. Embed Size px x x x x Modulating Control Valve Sizing and Selection -. Valvula masoneilan handbook for control valve sizing Technology. Determining the Valve Pressure Drop Characteristics, Bhatia, B.

Introduction Documents. Masoinellan Sizing Control Valve Documents. Regulator and Control Valve Sizing - kygas. On the other hand, Masoneilan Control Valve Sizing Handbook -.

Control Valve Sizing

Rotary Valves Valves vs. Because each of these topics are covered in the noted separate sections, they are not treated in detail in this section. While this section attempts to discuss all basic aspects of control valve selection and application, in this area too, there exists some overlap with other sections. For example, as noted in the alphabetic listing above, the topics of valve characteristics and rangeability are discussed in more detail in Section 6. It should also be noted that in most of the sections in this chapter English units are used with their SI equivalents given in parenthesis.

Flow Equations for Sizing Control Valves

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Greg will be posting questions and responses from the ISA Mentor Program, with contributions from program participants. This question comes from Hiten Dalal. Hiten has extensive experience in pipeline pressure and flow control. Selecting and sizing control valves seems to have become a lost art. Most engineers toss it over the fence to the vendor along with a handful of mostly wrong process data values, and a salesperson plugs the values into a vendor program which spits out a result.

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Thwarting Valve Troubles

Greg will be posting questions and responses from the ISA Mentor Program, with contributions from program participants. This question comes from Hiten Dalal. Hiten has extensive experience in pipeline pressure and flow control.

The tutorial is based on implementing three conventional PID control loops on a single-stage flash drum unit for a multicomponent, nonideal feed stream. The steps in the development process are: 1 2 3 4 5 6 7 steady-state design and simulation specifying dynamic characteristics of process equipment switching the simulation over to dynamics mode adding feedback controllers to the simulation adding stripchart displays carrying out dynamic tests and fitting transfer functions tuning the controllers. Steady-state Design and SimulationThe process unit that is design, simulated and studied in this tutorial is a single-stage flash drum, as shown in the figure below. Vapor Outlet. The flash drum is to operate at atmospheric pressure,


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