Case History

Hydrotreater Stripper Tower, Coolers, and Condensers at a petroleum refinery were successfully degassed and iron sufide scale was deactivated in just 12 hours

Results Achieved

Benzene and hydrogen sulfide free
Zero LEL’s after 12 hours of
vapor phase steam injection
No iron sulfide combustion

Chemicals Utilized


Rapid absorption and encapsulation of vapor-state hydrocarbons

H2S scavenger for the rapid and permanent elimination of H2S

Non-hazardous product for effective control of pyrophoric iron deposits

A petroleum refinery in the Northern United States used FQE® LEL-Vapor, FQE H2S Scavenger and FQE Pyrophoric to decontaminate and degas their hydrotreater stripper tower and related equipment.

The equipment was decontaminated of iron sulfide scale, LEL content gases and hydrogen sulfide from the process. Decontamination was required for scheduled maintenance work.

The equipment was cleaned by vapor phase steam injection with FQE H2S Scavenger and FQE LEL-Vapor for degassing of hazardous vapors. It was then treated with FQE Pyrophoric to deactivate the iron sulfide scale.

After 12 hours of chemical injection, the equipment was successfully degassed with no benzene, hydrocarbon, or hydrogen sulfide present on analysis. On opening the vessel, the equipment was clean and no iron sulfide scale combustion was encountered. The associated equipment was cleaned by liquid circulation as needed. The wash water was sent directly to waste water treatment without delay.

Previous work conducted by competitors had left noticeable hydrocarbon odors and there was none following FQE LEL-Vapor application.

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