A main shutoff will not fully close before valve replacement. What is the safe plan?
- ACut the pressurized pipe quickly
- Establish reliable upstream isolation and controlled drain-down
- CRely on the failed valve
- DHeat the wet pressurized joint
Why B is correct
Verification of isolation, pressure relief, drainage destination, affected occupants, backup controls, and emergency restoration prevents flooding and injury. A leaking valve is not dependable isolation.