High Temperature Trip Design Project

Salt Lake County, UT

Electrical Consultants, Inc. provided Marathon with a proposal to prepare engineering services and design drawings and other documents for the Reactor High Temperature Trip Project.

Marathon implemented a new control narrative to trip the TGU heaters and put the unit in cool down circulation mode when there is a high reactor temperature. The scope of this job involved removing thermocouples from the TGU I/O, installing temperature transmitters, and bringing the analog temperature signals into the SIS safety instrumented system located in the SRU I/O room. The previous flow control valve was converted to an Air Fail Open (AFO) valve and installed with a new 3-way solenoid valve in line with the instrument air supply. If the solenoid valve is de-energized or power is lost, the instrument air line of the flow control valve was vented to atmosphere, causing the valve to open.

ECI reviewed and modified existing documentation as required and generated new drawings and documents where necessary to detail the work.

  • Provided detailed electrical engineering design and review to Marathon Refinery’s high temperature trip project.

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