Water System Failure Analysis & Root-Cause Consulting

Every tube leak, exchanger fouling event, or boiler tube rupture leaves physical evidence that points to a specific mechanism if it is examined correctly. Pitting corrosion produces localised, often hemispherical cavities under deposits, chloride pockets, or halide-induced passive-film breakdown, and typically indicates a stagnant zone, an oxygen concentration cell, or an aggressive anion concentrating at a deposit-metal interface. Microbiologically influenced corrosion (MIC) produces tubercles or characteristic pitting morphology tied to sulphate-reducing or iron-oxidising bacteria colonies and is routinely mistaken for generic pitting until a metallurgist or corrosion specialist examines the deposit biology. Under-deposit corrosion develops beneath scale, sludge, or corrosion product that shields the metal surface, creating a differential aeration or concentration cell that accelerates localised attack far faster than the bulk-water corrosion rate would predict. Galvanic corrosion appears at dissimilar-metal junctions — brass fittings on steel piping, or admiralty tubes in a carbon-steel channel head — driven by the electrochemical potential difference between the two alloys. Erosion-corrosion shows directional, often horseshoe-shaped wear patterns at flow disturbances: tube inlets, elbows, and orifice edges, where high local velocity strips the protective film faster than it can reform.

Scaling and fouling failures follow a parallel logic. Calcium carbonate, calcium phosphate, and silica scale deposit where local temperature and concentration exceed the solubility product at the heat-transfer surface — typically the hottest film-side location in a cooling system or the highest-flux zone in a boiler. The result is insulating deposit that drives up metal temperature, which in boilers can trigger short-term overheat failures (bulging, thinning, and eventual rupture) at temperatures the bulk steam conditions would never explain. Biological fouling — algae, biofilm, and macrofouling from bivalves or debris in once-through and seawater systems — restricts flow, creates the low-velocity zones where under-deposit corrosion and MIC take hold, and can precipitate a cascading failure sequence that looks, on the surface, like a single random tube leak.

Diagnosing which mechanism is actually responsible requires more than a visual inspection. Our investigations combine deposit and corrosion-product analysis (SEM/EDS, XRD, ion chromatography where warranted) with metallurgical examination of failed sections, a review of operating history — chemistry logs, excursion records, cleaning and lay-up practices — and a structured root-cause analysis methodology that separates the immediate mechanism from the underlying programmatic cause. A tube may fail from chloride pitting, but the root cause is frequently a makeup water change, a lay-up procedure that was skipped, or a biocide program that lost efficacy months earlier. Naming the mechanism without identifying that upstream cause guarantees a repeat failure.

The output is a defensible, evidence-based report: failure mode, contributing factors, and a corrective action plan ranked by what actually prevents recurrence versus what merely treats the symptom. Where a failure has commercial or legal consequences — warranty disputes, contractor liability, insurance claims — the same methodology supports expert reporting and testimony.