Sr. Mechanical Engineer (PE) - Primoris Engineering

Primoris Engineering is currently seeking a licensed Senior Mechanical Engineer to join our Houston-based team! In this dynamic role, you’ll collaborate with top-tier clients across the onshore oil and gas transportation industry—including upstream, midstream, and petrochemical sectors. Prior experience in pipeline engineering is essential, along with a strong background in compressor and pump station systems.

This is a fantastic opportunity to be part of a dynamic, innovative operation that values expertise and collaboration, and thrives on client success. The core focus of our Houston Engineering office is Facilities and Pipelines, including Pump Stations, Compressor Stations, CO2 Capture Facilities, Tank Farms, Terminals (Loading/Unloading Truck, Rail, Marine), Pipeline Facilities (Traps, valve sites, meter sites, tie-ins, etc.), Upstream production pads, gathering pipelines and tank batteries.

Typical Job Responsibilities  

• Rotating and Static Equipment- Sizing Calculations for specialty items.  For Packaged equipment: prepare RFQ packages on Mechanical equipment including Datasheets and specifications, Technical Bid Evaluations, Vendor Drawing reviews interface with equipment vendors, provide clarifications for vendors, review/approve vendor drawings


• Pipe, Valves, Fittings - Pipe stress analysis (Caesar II), Pipe/Valve specifications, material and coating specifications, hydrotest calcs, BOM for purchase


• P&ID Development- Providing support to process in the development of P&IDs, as applicable


• Hydraulic Analysis- Flow assurance calculations for steady state and transient piping systems.


• Pipeline Engineering- pipeline design, HDD stress calculations, hydrofracture calcs, bending and wall-thinning calcs, Buoyancy, HCA/MCA/Class Locations, routing and workspace design, Crossings, Alignment sheet development with Mapping team


• Ensure project is in compliance with applicable codes and client standards.


• Interface with Design team- Equipment layout, 30/60/90 Model Reviews, IFR and IFC development, cross-discipline checking


• Interface with the Project Management team and provide progressing, scheduling and budgeting support


• Review and QA/QC all Mechanical and Piping deliverables


• PE Sign/Seal final documentation for permits and construction, as applicable

Required Qualifications (representative of the knowledge, skill, and/or ability required for the position)  

• Bachelor's Degree in Mechanical Engineering 


• 10+ years of experience with midstream facilities and pipelines in the US


• Experience working closely with designers


• In-office participation is required


• Client interfacing role may be required if assigned as a Lead; professionalism and ability to communicate effectively is required


• Travel not mandatory, but this role may require occasional site visits or client meetings


• Experience with static and rotating equipment i.e. compressors, pumps, valves, traps, strainers, tanks and piping


• Working knowledge of ASME B31.3, B31.4 and B31.8, CFR/DOT regulations, and other applicable API standards and recommended practices for design

Desired Qualifications  

• Professional Engineer licensure preferred, or working towards licensing.  Ability to obtain license in multiple states is a plus.


• Gas compression equipment experience is desired, with knowledge of reciprocating and Solar turbine machines is preferred.

Company Overview 

Primoris Engineering is comprised of highly qualified personnel and registered professional engineers providing the full array of engineering services capable of providing complete in-house engineering services with the ability to utilize high value engineering centers if needed. Primoris Engineering services both downstream and midstream energy sectors including refining, petrochemical, blue/gray hydrogen, syngas, LNG, biodiesel, renewable natural gas, and midstream pipelines, processing facilities, terminals, and gathering systems. 

Primoris is proud to offer the following to full time employees:

• Competitive compensation, paid weekly


• Best-in-class medical, dental, vision, and LTD/STD coverage


• 401(k) with company match, vested on day one


• Pet coverage for your furry friends


• Legal assistance coverage


• Award-winning safety programs

Agency Statement
We are not accepting resumes from Third Party Recruiting Firms for this position. If you are an Agency or Search firm representative, contact the Primoris Talent Acquisition Manager directly for consideration. Primoris or its subsidiaries will not be responsible for any fees arising from the use of resumes and online response forms through this source. In addition, Primoris or its subsidiaries will not be responsible for any fees on unsolicited resumes that are submitted to any member of the Staffing or Operations team. Primoris has established an approved vendor program for this service and will only consider accepting submissions from those approved firms. For consideration in becoming an approved vendor, contact HR.

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