Thermographic Inspection for Centrifugal Compressors
Specialized Thermographic Inspection programs for Centrifugal Compressor Reliability & Maintenance.
Why it matters
Key Benefits
Hot Spot Identification
Infrared thermal imaging identifies abnormal heat patterns across centrifugal compressors surfaces that indicate developing faults in the impeller, diffuser, journal and thrust bearings, dry gas seals, and balance piston. Temperature anomalies are detected during normal operation without production interruption.
Electrical Connection Integrity
Thermographic surveys of electrical terminations and connections serving centrifugal compressors identify high-resistance joints before they cause arcing, fires, or protective device trips. This is especially critical for connections carrying full load current.
Thermal Profile Baselining
Establishing thermal baselines for centrifugal compressors under normal operating conditions enables rapid detection of deviations. Comparative analysis between identical units identifies underperforming equipment and prioritizes maintenance resources.
Context
Challenge & Approach
The Reliability Challenge
Centrifugal compressor casings operate at elevated temperatures from compression heating, creating high ambient backgrounds that reduce thermal contrast for bearing and seal faults. Insulation on high-pressure compressor casings prevents direct casing surface measurement in many areas. Bearing housing temperatures are affected by lube oil supply temperature and flow rate as well as bearing condition. Dry gas seal vent temperatures indicate seal health but require knowledge of process gas conditions for interpretation. Casing bolting thermal expansion patterns influence alignment and must be evaluated separately from internal condition. Heat tracing and steam jacketing on compressor piping creates thermal artifacts near the machine.
Our Approach
We image bearing housings, seal areas, casing joints, lube oil piping, cooler shells, and control valve actuators with emissivity corrections for each surface type. Bearing housing temperature mapping identifies localized hot spots from bearing distress or lube oil flow restrictions. Seal system thermal patterns are compared between primary and secondary seal vents. Casing joint thermal profiles identify bolt relaxation and gasket leakage. Lube oil cooler imaging detects tube fouling through shell temperature distribution. Oil supply and return line temperatures at each bearing confirm oil circulation adequacy. Reports include full machine thermal maps, anomaly identification with severity ranking, and comparison against historical surveys and OEM temperature specifications.
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Learn More →Thermographic inspection of centrifugal compressors identifies abnormal thermal patterns indicating bearing overheating, electrical connection resistance, insulation degradation, and blockages or flow restrictions. Temperature differences between identical components or between operating and baseline conditions highlight developing faults in the impeller, diffuser, journal and thrust bearings, dry gas seals, and balance piston.
Yes, centrifugal compressors must be operating under normal load conditions during thermographic inspection to generate meaningful thermal signatures. Equipment should be at steady-state operating temperature, typically after at least 30 minutes of operation at normal load. Cold equipment will not reveal the thermal anomalies that indicate developing faults.
Modern infrared cameras provide temperature accuracy of plus or minus 2 degrees Celsius or 2 percent of reading. Emissivity corrections, reflected temperature compensation, and proper measurement distance are critical for accurate readings on centrifugal compressors surfaces. Polished or reflective metal surfaces require emissivity tape or coating for reliable measurements.
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Add Thermal Insight to Your Compressor Program
Our IR surveys detect bearing, seal, and cooling system problems in centrifugal compressors that online monitoring systems alone may not reveal.
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