Thermographic Inspection for Hydraulic Cylinders
Specialized Thermographic Inspection programs for Hydraulic Cylinder Reliability & Maintenance.
Why it matters
Key Benefits
Hot Spot Identification
Infrared thermal imaging identifies abnormal heat patterns across hydraulic cylinders surfaces that indicate developing faults in the cylinder barrel, piston, piston rod, seals, and end caps. Temperature anomalies are detected during normal operation without production interruption.
Electrical Connection Integrity
Thermographic surveys of electrical terminations and connections serving hydraulic cylinders 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 hydraulic cylinders 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
Hydraulic cylinder body temperatures are affected by system pressure, flow rate, duty cycle, and ambient conditions, with internal fault-related temperature changes often subtle. Piston seal bypass creates turbulent heating at the piston location that moves with the piston, requiring imaging at multiple stroke positions. Rod gland leakage produces localized heating at the gland area but may be intermittent and pressure-dependent. Cushion port restrictions create pressure drop heating during end-of-stroke deceleration that is momentary. Cylinder tube wall thickness and surface finish affect thermal conductivity and emissivity. Cylinders on mobile equipment operate in varying ambient and solar loading conditions. Thermal time constants on large cylinders delay fault signature appearance after pressure application.
Our Approach
We image hydraulic cylinder tubes along their full stroke length, both end caps, and rod gland areas during pressurized operation. Piston location is identified through thermal gradient changes along the tube. Internal bypass heating is detected through elevated temperature at the piston position compared to adjacent tube sections under static pressure hold. Rod gland temperatures are compared between pressurized and unpressurized conditions. Cushion area end cap temperatures during deceleration events indicate cushion valve function. Port area temperatures identify flow restrictions. We capture images during multiple stroke positions and pressure conditions to build a complete thermal picture. Reports include cylinder thermal maps at multiple stroke positions, internal leakage assessment, seal condition ratings, and rebuild priority recommendations based on thermal severity.
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Learn More →Thermographic inspection of hydraulic cylinders 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 cylinder barrel, piston, piston rod, seals, and end caps.
Yes, hydraulic cylinders 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 hydraulic cylinders surfaces. Polished or reflective metal surfaces require emissivity tape or coating for reliable measurements.
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Tell us about your equipment and facility. Our reliability team will review your situation and recommend a tailored reliability program — no obligation.
Assess Cylinder Seals Without Disassembly
Our thermal imaging detects internal bypass, rod seal leakage, and cushion faults in hydraulic cylinders during operation.
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