Is passivation cleaning necessary when a refining and petrochemical plant is shut down for maintenance?
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Is passivation cleaning necessary when a refining and petrochemical plant is shut down for maintenance? Previously, steaming and purging were used; nowadays, ferrous sulfide cleaning and passivation are commonly employed. Is it really necessary to do this?
Steam purging can clean up the vast majority of the material, but ferrous sulfide may still exist in areas prone to corrosion. Exposure to air after the equipment’s cover is removed can lead to spontaneous combustion; therefore, it is recommended to carry out passivation cleaning whenever conditions permit.
Steam purging can clean up the vast majority of the material, but ferrous sulfide may still exist in areas prone to corrosion. Exposure to air after the equipment’s cover is removed can lead to spontaneous combustion; therefore, it is recommended to carry out passivation cleaning whenever conditions permit.