Ultrasonic Testing for Steam Turbines
Specialized Ultrasonic Testing programs for Steam Turbine Reliability & Maintenance.
Why it matters
Key Benefits
Leak Detection
Airborne ultrasonic detection identifies pressure and vacuum leaks in steam turbines systems that are inaudible to the human ear. Locating leaks quickly reduces energy waste and prevents process quality problems.
Bearing Lubrication Optimization
Ultrasonic monitoring of steam turbines bearings provides real-time feedback during grease application to prevent both under-lubrication and over-lubrication. Proper lubrication extends bearing life and reduces friction-related energy losses.
Early-Stage Fault Detection
Contact ultrasonic measurements on steam turbines detect high-frequency stress waves generated by metal-to-metal contact, friction, and impacts in the rotor blades, nozzles, journal and thrust bearings, labyrinth seals, and governor. These signals appear weeks before vibration amplitude increases detectably.
Context
Challenge & Approach
The Reliability Challenge
Steam leaks produce strong ultrasonic signals, but high-temperature surfaces near the measurement points require heat-rated sensors and careful approach procedures. Background ultrasonic noise from steam flow through turbine internals, control valves, and extraction piping creates elevated baselines. Insulated turbine casings and piping attenuate ultrasonic transmission from internal leaks to the external surface. Valve seat leakage produces ultrasonic energy downstream of the valve that may be difficult to distinguish from normal flow noise when the valve is partially open. Gland seal steam creates intentional ultrasonic emission that must be separated from unintended casing leaks. Multiple leak sources in proximity can interfere with individual leak localization.
Our Approach
We scan turbine casing horizontal joints, flange connections, valve bodies, gland seal housings, and piping connections using airborne ultrasonic sensors with directional focusing capability. Leak signals are quantified by dBu level at standardized distances for severity comparison and trending. Valve seat leakage is assessed by scanning downstream of each valve during known-closed conditions. Casing joint integrity is evaluated along the entire horizontal joint length with position-referenced dBu recordings. Gland seal effectiveness is verified through ultrasonic emission levels compared against normal operation baselines. Contact ultrasonic sensors on bearing housings assess lubrication condition and mechanical health. Reports include leak location maps with severity ratings, estimated steam loss rates based on ultrasonic intensity calibrations, and repair prioritization considering energy loss, safety impact, and outage scheduling.
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Learn More →Ultrasonic testing detects bearing faults, lubrication deficiencies, internal leakage, and electrical discharge in steam turbines. Airborne ultrasonic detection locates pressure and vacuum leaks at joints, seals, and connections. Contact ultrasonic measurements identify early-stage metal fatigue and friction before vibration levels increase measurably.
Ultrasonic testing detects high-frequency stress waves that appear earlier in the fault progression than vibration amplitude increases in steam turbines. It is most sensitive to friction, impact, and turbulent flow, while vibration analysis excels at identifying specific fault types through frequency patterns. The two technologies are complementary rather than interchangeable for monitoring steam turbines.
Ultrasonic testing is effective on rotating and reciprocating components, pressure boundaries, and electrical systems associated with steam turbines. It is particularly valuable for slow-speed equipment where vibration signals are too weak for reliable analysis. Access to measurement points and background ultrasonic noise levels are the main factors that determine measurement quality.
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Find Every Steam Leak on Your Turbine System
Our ultrasonic surveys locate and quantify steam leaks at casing joints, valve seats, and gland seals to reduce energy loss and improve safety.
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