CCJ 2020 Best Practices Award: Hermiston Generating Plant

Category: Company News


Hydrogen purge remote activation helps keep employees safe

The Hermiston Generating Plant in Oregon was recently awarded the CCJ 2020 Best Practices Award for their installation of a hydrogen purge remote activation. TTS was proud to assist in this project, providing critical upgrades to the control system. The project provided greater safety for on-site engineers and improved automation which decreased plant downtime.

Read the full press release from CCJ of the project scope below:

Challenge. Provide an automatic remote means to purge a hydrogen-cooled generator without dispatching employees to the area.

Many 1990s-era 7FH2 generators were equipped with an automatic purge system that activated when hydrogen purity at the seals dropped below a specified set point. However, the controls were located in the collector compartment and could not be safely accessed if a hydrogen leak in that compartment was suspected. In the event seal oil was lost it would be unsafe to approach the collector compartment to activate the purge. If the controls were left in maintenance for any reason, there would be no way to activate the purge without endangering an employee.

Solution. Since the automation was already in place along with solenoid-activated hydrogen shutoff valves, hydrogen vent valve, and CO2 admission valve, all that was needed was to move the controls to the Mark V. Employees of Hermiston and TTS Energy Services, Orlando, Fla, modified control wiring and re-routed it to the Mark V. Because of the significant safety and liability concerns associated with hydrogen, a controls consultant was engaged to modify the Mark V logic and create a purge button to activate the purge from the Mark V HMI (photo right).

Results. Now control room operators can monitor hydrogen purity remotely and perform a preemptive purge in the event they lose seal oil, without putting employees or equipment at risk. The total cost of the project was less than $10,000.

About TTS
At TTS, we specialize in innovative and high value-engineered solutions that help our clients maintain, upgrade, and enhance their power generation and gas compression assets. Learn more at our website TTS Energy Services or contact us at (407) 677-0813.