Case Studies

Coating Cooling Water Exchangers

Since the early 1980s when use of chromate was banned as a corrosion and scale inhibitor for industrial cooling water systems, refineries have been challenged by the increased maintenance of exchangers. In the early 1990s a Gulf Coast refinery was introduced to thin film tube ID coating as a “value add” for its replacement carbon steel cooling water exchangers. The downtube coating was to improve scale “release” and a thin-film protective barrier to deposit corrosion. Since the initial application more than 200 cooling water exchangers across the entire refinery were coated...

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Tube Condition - Coated vs Uncoated

A refinery client pulled identical cooling water tube bundles in side by side service during a unit maintenance turnaround. Exchangers were installed at the same time more than 9 years ago, one of the bundles was coated down the full-length tube IDs and across the tubesheet faces. The refinery wanted to assess tube condition of the both exchangers using IRIS inspection. The coated and uncoated bundles were sent to Curran shop for surface prep; a near white substrate was required for IRIS inspection meaning the existing tube coating had to be removed...

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Curramix 3500

Curramix 3500 is a high temperature inorganic coating developed for FCC slurry, crude and hydrocarbon services where fouling and coking lead to frequent maintenance cleaning. Applied as a thin film (20-40 microns) the coating reduces surface tension to minimize product accumulation at the tube wall and improve release in normal operations...

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