PPRV Pressure Setting Procedure

Determine System Requirements

Understand the maximum allowable working pressure (MAWP) of the protected equipment
Obtain this information from equipment manufacturer specifications
Verify against relevant industry standards and regulations (ASME, API, etc.)

Apply Safety Factors

Add appropriate safety factor to MAWP (typically 1.1-1.5x)
Consider application-specific requirements (process fluids, temperature, etc.)
Account for potential pressure surges or transient conditions

Important Note

The safety factor must never exceed the system's design limits. Always consult relevant codes and standards for your specific application.

Adjust the PPRV

For spring-loaded PPRVs: Adjust spring tension via adjustment screw
Clockwise rotation increases set pressure (stronger spring tension)
Counter-clockwise rotation decreases set pressure (weaker spring tension)
For weight-loaded PPRVs: Adjust counterweight position or mass

Verification & Testing

Use calibrated pressure gauges with appropriate accuracy
Gradually increase system pressure while monitoring
Verify PPRV opens within ±3% of set pressure (typical requirement)
Document all test results and adjustments made

Maintenance Reminder

Regular testing intervals should be established based on service conditions (typically every 6-12 months). More frequent testing may be required for critical services or corrosive environments.