Emergency Mitigation of Critical Flow Control Equipment
TCB Industrial was contracted to repair a failed Howell-Bunger valve liner that had compromised operational reliability. Without intervention, the failure would have resulted in a prolonged forced outage and significant loss of generation.
Engineered Cofferdam Solution
To allow repairs while maintaining water control, TCB engineered and fabricated a steel cofferdam to isolate the work area. This approach enabled extended dry access to the valve without dewatering the broader system.
Once isolated, the failed liner was removed and hydro-demolition was performed to remove existing grout and concrete while preserving embedded reinforcement.
Precision Installation and Quality Control
A new liner was installed with full-time welding inspection and non-destructive examination throughout the process. Following installation, pressure grouting, surface preparation, and coating were completed before cofferdam removal.
Outcome
The valve was returned to service without a prolonged outage, preserving generation capability and minimizing operational disruption. The project highlighted TCB’s ability to combine civil, mechanical, and specialty engineering solutions under time-sensitive conditions.
