Calculate the pressure drop in a straight, horizontal, Schedule 40, DN 150 pipe due to friction and a custom filter with a “K” factor value of 0.75. The total pipe length is 15 m and water at 25°C flows through it at 3 m/s. The tank pressure is 500 kPa(g) and the depth of the water is 5.0 m.

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Open a new project in PIPE-FLO® and select the “SYSTEM” menu on the toolbar to initialize all key data such as units, fluid zones, and pipe specifications the same way as the Example Problem in Chapter 8.
Put in the tank, pipe, and flow demand according to the variables as specified in the problem statement.
Go to the menu used to insert fittings and valves the same way as if putting in an elbow or valve as explained in the previous example problem, and click on the “OTHER” category. Under this drop down menu, find the “Fixed K” option and click on it. This gives the user the opportunity to enter any “K” value for a device and provide a description for it. Using this method in PIPE-FLO®, any device can be created and a “K” value assigned. We can also specify a name for the device to keep track of it in the “Valves and Fitting” menu. For this problem, enter “Custom Filter” as the description and “0.75” for the “K” value. Note that PIPE-FLO® does not add a graphic symbol to the FLO-Sheet® so it is very important to check back to the “Valves and Fitting” menu to verify what components are already placed in the system rather than simply depending on the graphic of the fluid circuit.
Return to the FLO-Sheet® and select “CALCULATE” to have PIPE-FLO® calculate the pressure difference across the pipe and other variables. Be sure to show the other values that PIPE-FLO® is able to give to verify your hand calculations.
Calculations indicate a pressure drop of 10.48 kPa through the pipe, a total head loss of 1.072 m, and a friction factor of 0.016.

Question 10.15: Calculate the pressure drop in a straight, horizontal, Sched...

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