what is the next step to change unloading valve is lockout and tagout is done and zero energy is confirmed?
1. Verify isolation, Prepare the workspace, Remove the old unloading valve, Inspect and clean, Install the new unloading valve, Re-energize and test
2. Re-energize and test, verify isolation, Prepare the workspace, Remove the old unloading valve, Inspect and clean, Install the new unloading valve
3. Prepare the workspace, Remove the old unloading valve, Inspect and clean, Install the new unloading valve, Re-energize and test, Verify isolation
4. Remove the old unloading valve, Inspect and clean, Install the new unloading valve, Re-energize and test, verify isolation, Prepare the workspace