Discharging to atmosphere and want to use a known pressure boundary

If you are modeling a pipeline and you wish to use a Known Pressure Boundary node at the pipe outlet but also wish to include a pipe exit loss, the approach to take here is to insert a K (General Resistance) near the end of the line and set the K value to 1.0 (for an exit loss) as shown below. This will require a short pipe section at the end of the model. You can set the length of this pipe to be quite short.

This approach can also be used when discharging into a pressurised vessel and the vessel pressure can be entered for the outlet boundary of the pipeline.

• Related Articles

• Static pressure below fluid vapor pressure or negative

  This message is often indicative of a data-entry issue and every step should be taken to correct this issue in order to obtain more accurate results. This warning can occur for a number of reasons as follows: 1. When a data-entry error/omission has ...

• Reservoir/Tank Node & Negative Static Pressure

  When modeling a system with a reservoir or tan node at the outlet, it's important to note that the software will calculate the values for the supply pipeline based on the defined system operating conditions etc. We then need to review the results to ...

• Can FluidFlow be used for low-pressure ventilation design?

  FluidFlow can be used to model ducted ventilation systems. The below image of a more basic system captures the main nodes used in a ducted system. When you place a "Steel Pipe or Duct" on the flowsheet, you can set the duct to be circular or ...

• What is Stagnation Pressure?

  Stagnation Pressure is the sum of the Velocity Pressure & Static Pressure. Stagnation temperature is the temperature of the fluid at the stagnation pressure and likewise static temperature is the temperature of the fluid at the static pressure. The ...

• WASC Slurry Pressure Loss Correlation

  In general, the WASC correlation is the only method which considers vertical pipes, i.e. different equations are used for pipe inclinations above 30 degrees. Above 80 degrees, the solution assumes a vertical pipe. The WASC method uses only the d50 ...