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Location Name: San Antonio, TX 
Job/Requisition ID: 54483
Education Level: Bachelor's Required 
Relevant Experience Level: Mid Career (4-10 Years) 
Employee Group: Regular - Full Time 
Employee Subgroup: Salaried Exempt


Provides electrical, instrumentation, and controls engineering support for gathering systems, pipelines, terminals, and pump stations.  Responsible to provide SCADA (Supervisory Control and Data Acquisition) support and maintenance including PLC and HMI programming, data gathering from well head measurement, PID control loops, maintaining historical data and reports for operations, measurement and engineering.


Key Responsibilities

  • Works on capital projects including the review of electrical, controls, and network drawings, programming and commissioning of the controls system, and providing startup support including troubleshooting and loop tuning.
  • Programs and maintains various PLCs and HMIs but primarily Modicon Quantum, SCADAPack 32 and Fisher ROC 827. Supports operations and engineering through the MOC process, ongoing maintenance, and troubleshooting.
  • Supports a wide range of communications protocols, networks, and radio telemetry including Ethernet I/O, Device Level Rings, Ethernet Radios, Serial Radios, Modbus and OPC.
  • Responsible to provide alarming and proper annunciation for operations including strobes and horns and maintaining a call out system.
  • Maintains proper controls documentation including cause and effect diagrams, controls narratives, and network drawings. Responsible to program according to these documents and update them as part of the MOC process.
  • Serves as primary leak detection contact for operations, responsible for specifying and reviewing system upgrades to promote world class leak detection.
  • Works with engineering, measurement and operations on designing, commissioning, troubleshooting LACT skids and gathering systems.
  • Works extended hours, including nights and weekends, in process operations environment and during periods of inclement weather. Responds to upset conditions during off-hours.



Education & Experience

  • Minimum Bachelor’s degree in Electrical or Controls Engineering required.
  • Minimum 5 years’ industry experience in Electrical, Instrumentation, and Controls Engineering required.
  • Experience in PLC & HMI Programming required.



  • Strong communication skills with ability to work independently and report on work activity.
  • Understanding of PLC Programming including ladder logic, function block, and structured text.
  • Understanding of various networks and protocols.
  • Understanding of Industry Specific Standards such as NEC, API, and DOT standards.
  • Operations are performed 7 days a week 24 hours a day; therefore, continuous support is required including rotational weekend on call support.




About Marathon Petroleum Corporation

Marathon Petroleum Corporation (NYSE: MPC) is a large-scale geographically-diversified and highly -integrated refining, marketing and midstream company. MPC is the nation's largest refiner, with a crude oil refining capacity of more than 3 million barrels per calendar day in its 16-refinery system. MPC's high-quality, nationwide retail and marketing business includes approximately 3,900 company-owned and -operated stores and 7,800 branded locations. MPC owns the general partners of MPLX LP and Andeavor Logistics LP, two strong, customer-focused midstream master limited partnerships.

Job Function: T and L
Travel Expected: Up to 50% 

Marathon Petroleum Company LP is an Equal Opportunity Employer and gives consideration for employment to qualified applicants without discrimination on the basis of race, color, religion, creed, sex, gender (including pregnancy, childbirth, breastfeeding or related medical conditions), sexual orientation, gender identity, gender expression, age, mental or physical disability, medical condition or AIDS/HIV status, ancestry, national origin, genetic information, military, veteran status, marital status, citizenship  or any other status protected by applicable federal, state, or local laws.  If you would like more information about your EEO rights as an applicant, click here.

If you need a reasonable accommodation for any part of the application process at Marathon Petroleum LP, please contact our Human Resources Department at Please specify the reasonable accommodation you are requesting, along with the job posting number in which you may be interested. A Human Resources representative will review your request and contact you to discuss a reasonable accommodation.

Equal Opportunity Employer: Veteran / Disability

Marathon Petroleum Company LP participates in the E-Verify program in some states in which it operates (including AL, AZ, GA, MS, NC, SC, TN, and UT). For more information before proceeding, please see details in English or Spanish. Right to Work Statement English or Spanish.

Nearest Major Market: San Antonio

Job Segment: Controls Engineer, Engineer, Electrical, Instrumentation, Engineering

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