Updated 2 weeks ago
By Sarah Williams
Safety Warning
- Ensure system is properly isolated before removing relief valves
- Use proper lifting techniques and equipment when handling valves
- Verify test bench safety systems are operational before testing
- Ensure proper documentation and tagging of tested valves
Equipment Information
This SOP applies to the following equipment
Equipment Type
Pressure Relief Valve
Applicable Models
Leser, Crosby, Anderson Greenwood, Farris
1
Preparation and Removal
Safely remove the PRV from service
30-45 minutes
Tools: Lockout/tagout kit, Lifting equipment, Valve tagging system, Blind flanges
- Verify isolation of equipment protected by the PRV
- Ensure alternative pressure protection is in place if required
- Carefully remove PRV using proper tools and lifting equipment
- Tag valve with identification and service information
2
Initial Inspection
Perform external inspection before testing
15-20 minutes
Tools: Inspection checklist, Digital camera, Cleaning supplies
- Check for visible damage, corrosion, or foreign material
- Verify nameplate information matches documentation
- Inspect flange faces for damage
- Document initial condition with photographs
3
Bench Testing
Test valve operation on certified test bench
30-45 minutes
Tools: Certified test bench, Test medium supply, Pressure recording equipment, Test documentation
- Mount valve on appropriate test bench
- Gradually increase pressure and record opening pressure
- Verify opening pressure against setpoint requirements
- Check for proper reseating and leakage
4
Disassembly and Internal Inspection
Disassemble valve and inspect internal components
45-60 minutes
Tools: Manufacturer's maintenance manual, Specialized valve tools, Inspection gauges, Cleaning equipment
- Disassemble valve following manufacturer's procedure
- Inspect spring for damage, corrosion, or deformation
- Check seating surfaces for damage or erosion
- Inspect guide surfaces and disc for wear or damage
5
Maintenance and Repair
Perform necessary repairs and maintenance
1-2 hours
Tools: Replacement parts kit, Lapping tools, Cleaning equipment, Approved lubricants
- Replace damaged or worn components with OEM parts
- Lap seating surfaces if required
- Clean all components thoroughly
- Lubricate moving parts according to manufacturer's specifications
6
Reassembly and Final Testing
Reassemble valve and perform certification testing
45-60 minutes
Tools: Torque wrench, Test bench, Certification tags, Documentation forms
- Reassemble valve following manufacturer's procedure
- Adjust spring compression to achieve correct setpoint
- Perform final test to verify opening pressure and operation
- Apply test tag or seal and complete certification documentation