CASE HISTORY
NO. I46200 / I40050
2001 - 2010
CLIENT:
Dow Chemicals - Benelux
Terneuzen, Holland
UNIT:
E220 Vertical Caustic Heat Exchanger
296 Tubes, Inconel 600
32mm OD X 3.56mm wall thickness

PROBLEM:

Eddy Current Testing revealed severe wall thinning in all tubes, with 73 tubes identified as having problems up to depths of 28”.


SOLUTION:

In September 2001, CTI installed via mechanical expansion
296 CTI Shield/Seals made of Alloy 600. Seventy Three (73) Shields were 31” long in order to completely by-pass the depth of the existing tube damage. The Shields were 10” long. In October of 2004, Dow began a series of “remove-and- replace” projects on the same E220 exchanger. All existing CTI Shields were removed from the parent tubes and replaced with new Alloy 600 Shields. Subsequent projects took place in 2006, 2008 and again in March 2010.

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