TCB Industrial has been awarded a turbine shutoff valve (TSV) work scope supporting unit modernization at a Northern California hydroelectric facility. Turbine shutoff valves are among the most critical mechanical components in a hydroelectric plant, providing the ability to isolate turbines safely during maintenance, emergency conditions, or abnormal operating events.
This award supports modernization efforts intended to improve operability, maintainability, and long-term reliability of turbine isolation systems.
Role of turbine shutoff valves in hydroelectric facilities
TSVs function as primary isolation devices between the penstock and turbine, controlling large volumes of high-energy water. Their reliability directly affects personnel safety, outage planning, and asset protection. Aging TSV systems may suffer from wear, corrosion, seal degradation, or outdated actuation components that reduce reliability or increase maintenance burden.
Modern TSV work often extends beyond valve replacement alone. It includes integration with actuation systems, interface alignment, and verification that the valve performs predictably under both normal and emergency operating conditions.
Execution planning and technical considerations
TCB’s execution approach begins with detailed planning to understand valve geometry, access constraints, lifting requirements, and interface conditions. TSVs are large, heavy components typically installed in confined powerhouse environments where clearances are limited and permanent lifting systems may be constrained.
Work sequencing is developed to control load paths, maintain stability during removal or installation, and protect adjacent equipment and civil structures. Temporary supports, specialized rigging, and controlled positioning methods are used to ensure predictable movement throughout the process.
Safety and risk management
TSV work introduces multiple high-consequence hazards, including suspended loads, confined access, and proximity to pressurized systems. TCB implements task-specific safety planning, including lift plans where required, defined exclusion zones, and clear communication protocols.
Isolation boundaries are verified in coordination with operations to ensure no unintended water or energy exposure during execution. Crews are briefed on hazards, sequencing, and stop-work authority before critical steps begin.
Quality and long-term performance
Installation quality is critical to TSV performance. TCB emphasizes proper alignment, secure seating, and integration with existing supports and actuation systems. Verification activities are performed to confirm that installed components operate smoothly and support future maintenance access.
The objective is to deliver a TSV installation that enhances safety, supports predictable outage planning, and reduces long-term operational risk.
What this award represents
This project reflects TCB’s depth in executing large-scale hydro-mechanical work involving critical components. By combining planning discipline, rigging expertise, and quality workmanship, TCB supports modernization of essential hydroelectric infrastructure.
