6" Line stop
Project Overview
We completed two 6″ live line isolations on active heating-glycol mains to replace failed shutoff valves—without shutdown or system drain-down. Using a detailed Method of Procedure (MOP), controlled monitoring, hot tapping, and dual line stops, we established safe isolation, installed new valves, and restored service seamlessly. The project concluded with full testing, inspections, and a comprehensive QA/QC turnover package ensuring verified performance and documented compliance.
Safety, Quality & Documentation
To confirm integrity and compliance, we performed valve integrity and bubble tests, torque and closure checks on the new valves, and weld inspection/NDE on the fittings where required. The project was handed over with a full QA/QC package—including the MOP, test records, photos, redlined as-builts, and formal sign-offs—providing a defensible, well-documented record of the live line isolation on heating for the owner and their operators.
Project Impact
This line isolation on heating avoided a full drain-down—eliminating glycol loss, refill time, air ingress, and restart risk—while keeping heating available to occupants throughout. The targeted isolation shortened the workface window and reduced schedule and cost compared to traditional drain/replace/recharge methods. Restored shutoff capability improves maintainability and future shutdown planning, and the QA/QC package supports ongoing operations and compliance.
