Field Record
Large-Diameter Reducing Joint — Field Repair Under Live Pressure
Large-diameter joints are usually the hardest leaks to schedule: the pipe cannot simply be drained and cut out without isolating a whole district. This joint was leaking with the trench already open and water present, so the repair had to be a wrap applied from the outside.
The clamp is delivered as segments, assembled around the pipe in the trench and closed with bolts. Because nothing is welded and nothing is cut, the working window is limited only by how long the excavation can stay open.
The clamp is delivered as segments, assembled around the pipe in the trench and closed with bolts. Because nothing is welded and nothing is cut, the working window is limited only by how long the excavation can stay open.
The clamp is delivered as segments, assembled around the pipe in the trench and closed with bolts. Because nothing is welded and nothing is cut, the working window is limited only by how long the excavation can stay open.
Once the bolts were torqued the joint held at line pressure. The main was never taken out of service, which is the whole point of a mechanical repair on a large-diameter line — the cost of a shutdown is measured in customers, not in hours.
Once the bolts were torqued the joint held at line pressure. The main was never taken out of service, which is the whole point of a mechanical repair on a large-diameter line — the cost of a shutdown is measured in customers, not in hours.