Three refinery locations were identified for the evaluation of a hydrogen flux measurement tool. At the first, spot flux measurements were carried out at identical sites in a pair of very similar crude distillation units. Certain locations were proximal to an online wall thickness monitor. Although hydrogen activities derived from the measured flux were very low, there was correspondence in flux activities obtained from identical measurement sites. The wall thickness measurements and proximal flux measurements were co-incidentally very low.

At the second location, higher hydrogen activities were identified at a number of locations subject naphthenic acid/sulfidic corrosion. There was very significant co-trending of activities between sites at each location, but activities correlated more closely with ‘Potential H2S’ obtained from crude oil data than from the TAN of crude fractions tested, perhaps because the latter was moderately low. At a third location, flux monitoring of the bakeouts of three vessels yielded flux data corresponding closely with expected hydrogen content in the vessels due to prior service.

Subject
Fluxes, Probes, Thickness measurement, Tools, Refineries, Hydrogen flux, Amines, Wall thickness, Steel, Crude, Hydrogen, Oil, High temperature
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2004
Association for Materials Protection and Performance (AMPP)
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