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.

Note: If the Tag Dialog Prompt option is turned off in the PID Document dialog's Settings tab, then a default tag number will be used and the Component Properties dialog does not display. The next available tag number in an incremental sequence is assigned to the component. Properties and tag numbers can be edited in the Element Info dialog after placement.

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.

Note: This rule can be applied to any project that has a PSV with a distinctive outlet port side Graphic. These components can be found in the OPPID_ISO project under Valves.

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:

Change the run flowing out of PSV outlet port.

PSV Outlet Port will not flip when:

Change the run flowing into or out of PSV inlet port.
Change run flowing into PSV outlet port.

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.
Note: Note this also works with a straight Pressure Relief Valve.

Note: Do not change the size on the newly created pipe run when prompted (100x100).
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.