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Senscient provides HF detection for HollyFrontier refinery

Alkylation is one of the conversion processes used in petroleum refineries. It creates additives that boost the octane of gasoline by converting isobutanes into an alkylate.

The process occurs in the presence of a strong acid, acting as a catalyst. In many cases, the acid used is Hydrogen Fluoride (HF).  The Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) regulate HF as highly toxic.  If released in the atmosphere, HF rapidly forms dense vapor clouds that hover near land and can travel great distances.  Like other powerful acids, HF can cause deep severe burns and damage the eyes, skin, nose, throat and respiratory system.

As a result of the hazards associated with HF , HollyFrontier was seeking a solution to provide the maximum protection with the highest availability and no maintenance for its Cheyenne Refinery located in Wyoming.   HollyFrontier worked with Senscient’s distributor, Relevant Solutions, to evaluate the Senscient technology.  The solution provided by Relevant is a system composed of four individual Senscient open-path HF gas detection sensors, creating a full detection perimeter around the Alkylation Unit process area.

It was determined that using the ELDSTM open path system is the best solution to provide all the safety criteria required by the refinery plus additional benefits.  These benefits included;

  • Maximized coverage area with the least amount of detectors. 
  • Extremely low detection threshold to provided advanced warning in the event of a leak. 
  • A full-scale response time of less than three seconds, also providing advance warning.
  • In addition to these feature, the ELDSTM systems require no scheduled maintenance, calibration or replacement parts.  This is a big advantage to the refinery because they won’t need to send in operators on a regular basis to maintain or calibrate the devices.

Overall, the Senscient technology far exceeded any solution that had been evaluated to solve the needs of the Cheyenne Refinery.

HollyFrontier Cheyenne Refinery1

HollyFrontier Cheyenne Refinery at dusk

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