Oil Analysis for Plate Heat Exchangers
Specialized Oil & Lubrication Analysis programs for Plate Heat Exchanger Reliability & Maintenance.
Why it matters
Key Benefits
Wear Metal Trending
Spectrometric oil analysis tracks iron, copper, tin, and lead concentrations in plate heat exchangers lubricant samples to identify wear patterns in the plate pack, gaskets, frame plates, tightening bolts, and port connections. Rising wear metal trends trigger investigation before component damage becomes severe.
Contamination Detection
Particle counting and moisture analysis identify external contaminants entering plate heat exchangers lubrication systems. Catching contamination early prevents accelerated wear of the plate pack, gaskets, frame plates, tightening bolts, and port connections and extends fluid service life.
Lubricant Condition Monitoring
Viscosity, acid number, and oxidation testing confirm whether plate heat exchangers lubricant remains within specification. Replacing degraded fluid on condition rather than on a fixed schedule reduces both lubricant costs and the risk of lubrication-related failures.
Context
Challenge & Approach
The Reliability Challenge
Plate heat exchanger gaskets can develop external leaks or internal bypass that allows cross-contamination between circuits without visible external indication. Gasket materials degrade from thermal cycling, chemical exposure, and compression set, developing leaks gradually. Internal gasket bypass is particularly insidious because it mixes fluids at operating pressure, potentially forcing contaminated fluid into the higher-pressure circuit. Thermal oil circuits through plate exchangers experience localized overheating at fouled plate surfaces. Cleaning chemicals used during plate exchanger maintenance may contaminate oil circuits if not thoroughly flushed. Small channel gaps amplify the performance impact of fouling, which may be detected through fluid analysis before pressure drop measurements indicate a problem.
Our Approach
We sample fluids from both circuits of plate heat exchangers and analyze for cross-contamination indicators. Lube oil samples are tested for cooling water chemistry (calcium, sodium, chlorides) and glycol by FTIR. Cooling water samples are tested for oil sheen and hydrocarbon content. Thermal oil is analyzed for cracking products (flash point depression, carbon residue, viscosity change) and oxidation (TAN, FTIR). We compare fluid chemistry between inlet and outlet sampling points on both circuits to detect subtle contamination. Particle counting on oil circuits identifies fouling-generated debris. Reports include gasket integrity assessment based on contamination trending, thermal fluid condition rating, and recommended gasket inspection or replacement intervals based on degradation trends.
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Learn More →Oil analysis for plate heat exchangers reveals wear metal concentrations indicating degradation of the plate pack, gaskets, frame plates, tightening bolts, and port connections, contamination levels from water or process fluid ingress, and lubricant condition including viscosity, oxidation, and additive depletion. Ferrographic analysis identifies the size, shape, and composition of wear particles to pinpoint which component is generating debris.
Sampling intervals for plate heat exchangers depend on criticality and operating severity. Most programs sample critical equipment monthly and non-critical equipment quarterly. Newly commissioned or recently repaired plate heat exchangers should be sampled more frequently during the first few operating cycles to confirm break-in conditions are normal.
The core test slate for plate heat exchangers includes spectrometric wear metal analysis, particle count per ISO 4406, moisture content, viscosity at 40C, and acid number. Analytical ferrography should be added when screening tests indicate abnormal wear. Additional tests such as RPVOT for oxidation stability may be warranted depending on lubricant type and operating temperature.
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Catch Plate Exchanger Gasket Leaks Early
Our oil analysis detects internal gasket bypass and fluid cross-contamination in plate heat exchangers before downstream equipment is damaged.
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