Top 5 Causes of Heat Exchanger Tube Failures — and How to Prevent Them
Mr. Toey
DLSS-Pipe&Tube-Top 5 Causes of Heat Exchanger Tube Failures — and How to Prevent Them
Introduction
Heat exchanger tubes are critical components in industries ranging from petrochemical and power generation to pharmaceutical and food processing. Yet, even with high-quality stainless or alloy tubes, failures still occur—often resulting in costly downtime, environmental risk, and unplanned shutdowns.
This article identifies the top five root causes of tube failure in shell-and-tube or finned heat exchangers—and outlines how to avoid them through smart material choices, preventive inspection, and system design.
1. Pitting Corrosion
What it is: Localized corrosion that leads to deep, narrow holes—usually caused by chlorides or poor surface passivation.
Common Triggers:
Improper cleaning after welding
Use of 304/316 stainless in high-chloride media
Stagnant zones with low flow velocity
Prevention Tips:
Use 254 SMO, Duplex 2205, or Titanium in seawater or brine
Specify bright annealed surface to reduce crevice formation
Maintain flow velocity ≥ 1.5 m/s to prevent sedimentation
What it is: Cracking induced by the combination of tensile stress, high temperature, and corrosive agents (often chlorides or ammonia).
Materials Affected:
Austenitic grades like TP304, TP316
Common in refineries, power plants, and fertilizer units
Prevention Tips:
Switch to Duplex stainless, Incoloy 825, or Alloy 20
Use tubes compliant with NACE MR0175 in sour service
Reduce operational temperature and mechanical load
3. Erosion-Corrosion
What it is: Metal loss caused by high-velocity fluid or impinging particles combined with corrosive fluid.
Common Signs:
Thinning near tube inlets or bends
Grooving, pitting with directional wear
Vibration-induced tube flutter
Prevention Tips:
Add tube inserts or impingement plates
Choose CuNi 90/10 or Monel 400 in seawater cooling
Ensure smooth inlet design and steady fluid flow
4. Thermal Fatigue
What it is: Cyclic temperature changes cause tube expansion and contraction, eventually leading to cracking or rupture.
Typical Causes:
Sudden startup/shutdown cycles
Uneven heat transfer across tube bundle
Inadequate tube sheet expansion control
Prevention Tips:
Use seamless tubes with low residual stress
Design with flexible tube supports and expansion joints
Perform post-weld heat treatment (PWHT) where required
5. Fouling and Scaling
What it is: Accumulation of deposits like calcium carbonate, iron oxide, or organic biofilms that reduce heat transfer efficiency and induce under-deposit corrosion.
Typical Sources:
Untreated cooling water
Inadequate cleaning intervals
High suspended solids in fluid
Prevention Tips:
Choose BA surface tubes to minimize adhesion
Use low-finned tubes to enhance turbulence and self-cleaning
Establish regular CIP (clean-in-place) protocols
Bonus Tip: Poor Material Traceability
Issue: Incorrect or undocumented alloy grade leads to mismatch between material and service conditions.
Solution:
Request EN 10204 3.1 or 3.2 MTCs
Use PMI (Positive Material Identification) before installation
Work with verified manufacturers like DLSS
DLSS: Your Partner in Failure Prevention
DLSS supplies:
Seamless tubes in TP316L, TP321, Incoloy 825, Duplex 2205, and more
Heat exchanger tubes tested for corrosion, hardness, grain size, and pressure
Inspection-ready documentation with 3.1 / 3.2 certification
Custom cut-to-length or U-bent tubes for power plants, refineries, chemical plants
Conclusion
Understanding and preventing tube failures saves money, time, and reputational damage. Whether it’s stress cracking or under-deposit corrosion, the solution often lies in proper alloy selection, thoughtful design, and proactive inspection.
Choose DLSS to help you engineer longer-lasting, failure-resistant tube systems.
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