In situ coating application expected to extend tube life

Coating applications on heat exchanger carbon-steel tubes can extend the life of the tubes and reduce the number of maintenance downtimes. Hoping to accomplish that, in December 1997, Citgo's Lake Charles, La., refinery applied an in situ coating to the tubes of six of its propylene exchangers. The six exchangers are part of the refrigeration section of Citgo's catalytic cracker recovery unit. All six exchangers have carbon steel tubes in cooling water service. Cooling water runs on the tube side of the exchangers, and ammonia runs on the shell side. Scope of work The six propylene exchangers that Citgo coated have fixed tubesheets. Fixed tubesheets are cost...

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