Location: Galveston, TX Industry: Refining / Petrochemical / Terminal Operations Employment Type: Contract / Part-Time Experience Level: Mid-Level Preferred Position Summary On Grid Infrastructure Services is seeking a detail-oriented and experienced CAD Designer to support engineering and operations projects within the refining, petrochemical, and terminal operations industries, with a preference for candidates experienced in crude distillation units (CDUs) and associated process systems. This part-time role will support drafting, design updates, as-built documentation, and project deliverables for brownfield facility modifications and operational improvement projects. The ideal candidate will have hands-on experience working with refinery or terminal facility drawings, including P&IDs, plot plans, equipment layouts, piping isometrics, and electrical/instrumentation drawings. Key Responsibilities • Develop, revise, and maintain CAD drawings for refinery, petrochemical, and terminal facilities • Update and manage: o Piping & Instrumentation Diagrams (P&IDs) o General arrangement drawings o Equipment layouts o Plot plans o Isometric drawings o Structural and support drawings • Incorporate field redlines and produce accurate as-built documentation • Coordinate with engineers, operations personnel, maintenance teams, and contractors • Support Management of Change (MOC) documentation updates • Assist with design packages for small capital and maintenance projects • Ensure drawings comply with company drafting standards and applicable industry codes • Participate in occasional field walk-downs in operating industrial facilities Required Qualifications • 3+ years of CAD drafting/design experience in: o Refining o Petrochemical o Midstream terminal operations o Industrial process facilities • Proficiency with AutoCAD required • Strong understanding of refinery/process facility documentation and terminology • Experience interpreting P&IDs and piping layouts • Familiarity with crude distillation units and related systems preferred • Ability to work independently with minimal supervision • Strong attention to detail and organizational skills Preferred Qualifications • Experience with AutoCAD Plant 3D or CADWorx • Knowledge of API, ASME, and OSHA standards applicable to refining facilities • Prior experience supporting brownfield or operating facilities • Field verification and walk-down experience • TWIC card or ability to obtain one preferred Work Schedule & Environment • Part-time schedule with flexible hours based on project workload • Onsite work is required • Candidates local to the Galveston/Houston Gulf Coast region strongly preferred Compensation Compensation will be based on experience, qualifications, and availability.