Generator Hydrogen Leak Detection: Protecting Your Rotor and Avoiding Unplanned Outages

Hydrogen-cooled generators are efficient, but hydrogen is also a small, fast-moving molecule that finds its way through the tiniest imperfections in seals, gaskets, and joints. A slow hydrogen leak rarely causes an immediate problem, but it steadily raises operating costs, increases safety risk, and can point to a larger mechanical issue developing inside the machine.

Why Hydrogen Leaks Matter

Beyond the obvious safety concerns of a combustible gas, hydrogen loss forces more frequent makeup gas purchases and can indicate degrading shaft seals or gasket wear that will only get worse under continued operation. Left unaddressed, a leak that starts as a maintenance nuisance can progress into a forced outage.

Where Leaks Typically Occur

• Shaft seal oil systems and seal ring wear surfaces

• Bushings and terminal box connections

• Casing joints, manholes, and inspection covers

• Gas control valves, piping connections, and instrumentation taps

Detection Approaches

Field technicians typically combine a few methods depending on the suspected location: portable hydrogen sniffers for quick point checks, soap-bubble testing on accessible joints and connections, and gas consumption trending over time to catch leaks too small to pinpoint by hand. Consumption trending is particularly useful because it flags a developing problem before it's large enough to find with a handheld detector.

Building a Routine Around It

The plants that manage hydrogen loss best don't wait for a purity alarm. They track daily makeup gas consumption against a baseline, investigate any sustained upward trend, and schedule a full leak survey at set intervals rather than only after a problem is already suspected.

Ready to get ahead of leaks before they cost you? Contact StrongForce, Inc. at 833-735-3257 or info@StrongForceInc.com to schedule a survey or speak with one of our field engineers.