Pressure Safety Valves
Inline and Angle Pressure Safety Valve symbols are available for placement on the drawing.
Accessed by selecting one of the Pressure Safety Valve options in the Valves Gallery.
After the valve symbol is selected, the Component Properties dialog displays prompting you to define a tag number for the valve and make any changes to the valve's component properties.
Orientation of Outlet Port
By default, the outlet port of a Pressure Safety Valve is oriented on the pipe run with the larger run size. However, if both runs are the same size, there is a variable that can be set which will allow the user to orient the outlet port to the correct run according to the flow direction.
In the OPPID_ISO.pcf file add the following statement:
PID_REDUCER_ALLOW_SAME_SIZES_CLASSES=PRESSURE_SAFETY_VALVE
Save and close the file, then open a drawing in the Iso workspace.
Model Validation
Ordinarily when a PSV is placed on a line where both runs have the same size, this will return a message when the Model Validation command is executed such as:
The main (100) and reducing (100) size values are the same or empty.as usually these valves are placed where the runs have different sizes. When the configuration variable is set, this scenario will not be flagged when validating the model.
Rules for Orientating the Outlet Port
OpenPlant PID applies the following rules to determine when the outlet port will orient itself:
PSV Outlet Port will flip when:
PSV Outlet Port will not flip when:
PSV Orientation Example
Below is an example of how the PSV valve can be oriented when working in the OPPID_ISO workspace:
- Place a pipeline in the drawing.
- Place an angled PSV valve on the line.
- Turn the flow arrows on for both pipe runs.
- Change the Flow from Forward to Backward on the Horizontal run. Notice the arrow flips but the valves does not flip.
- Change the Flow from Forward to Backward on the Vertical pipe run. The arrow flips and the valve flips.