Vollie Pendergrass (left) and Nicole Nix, lead service engineers, clean heat exchangers at a California petroleum refinery. After they were decontaminated, an inspection revealed a significant amount of iron sulfides (FeS) remained in the exchangers and would require an acid wash to dissolve them. The H2S rig was utilized for this cleaning because hydrogen sulfide gas is liberated during the acid wash and the rig scrubs the H2S.
Decontaminating various oil-refinery equipment – pressure vessels, pipelines, exchangers, condensers and the like – used to be an equipment- and labor-intensive job for crews at Delta Tech Service Inc., a national chemical-cleaning company based in Benicia, Calif.
But that...
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