(225) 291-9988


Looking forward to hearing from you!


We Are A Full Service, Multi-discipline
Engineering And Design Company

We Provide Experienced Based,
Cost Effective Design Solutions
Delivered On Time & Within Budget.

  • Basic Engineering Package Design
  • Commissioning & Startup
  • Conceptual Design
  • Cost Reduction Engineering
  • Debottleneck & Expansion
  • Energy Conservation Studies & Design
  • Equipment Design / Rating
  • Facility Re-Build Estimating, Planning
  • Facility Re-Build Engineering & Construction Support
  • Feasibilities Studies
  • First-Of-A-Kind Technology Development
  • Front-End Engineering Design (FEED)
  • Grassroots Design
  • Heat & Material Balances
  • Hydraulic Analyses
  • Licensed Technology Development
  • Operating, Startup & Shutdown Procedures
  • Performance & Rate Tests
  • Pilot Plant Design & Build
  • Process Design Basis (PDB) Development
  • Process Evaluation / Optimization
  • Process Modeling / Simulation
  • Process Safety Analyses (PSA)
  • Process Troubleshooting
  • Research & Development
  • Revamps / Retrofit
  • Risk-Based Inspection (RBI) Strategies
  • Screening Studies
  • Bid Specification Packages
  • Bid Specifications & Terms Tabulation
  • Compressor / Pump Specification
  • Cooling Water Survey (Field Measurement)
  • Cryogenic Service / Materials Design
  • Dust Collection System Design
  • Equipment / Stress Analysis
  • Fatigue Analysis
  • Finite Element Analysis
  • Heat Exchanger Specification
  • Materials of Construction Selection
  • Material Takeoffs
  • Mechanical Detail Design
  • Procurement
  • Solids Handling Equipment Design
  • Tank Design
  • Thermal Analysis
  • Total Installed Cost (TIC) Estimating
  • Transient Flow Pipe Stress (Dynamic)
  • Vessel Design & Rerates
  • Vibration (Dynamic)
  • Building and Equipment Layout
  • Civil / Structural Design
  • Coordination with Utility Companies
  • Detention Pond Design
  • Drainage Hydraulic Design
  • Drainage Studies and Improvements
  • Foundations & Structures Analysis
  • Earthwork Design
  • Equipment Support Structure Design
  • Erosion and Sediment Control Design
  • Foundation Design & Loading Drawings
  • Grading Plans
  • On-site Construction Support
  • Permitting
  • Piling Design
  • Pipeline Installation/Relocation
  • Plot Plans / Site Plans
  • Rail Design
  • Seismic and Wind Force Design
  • Site Surveys
  • Storm Water Management
  • Structural Steel Analysis & Design
  • Topography
  • Underground Pipe Design & Installation
  • Walkways, Ladders, & Platforms Design
  • Wastewater Collection and Treatment Systems
  • Water and Sewer System Design
  • ARC Flash Analysis
  • Analytical Systems Engineering & Design
  • Cable Tray Routing & Size Specifications
  • Control Panel Design
  • Control Philosophy
  • Control Systems Engineering & Design
  • DCS, PLC & Measurement Systems
  • DCS/PLC Panel General Arrangment Layout & Design
  • DC Power System Design
  • Distribution Panels Design
  • Electrical Area Classifications Drawings
  • Electrical Distribution Equipment Design
  • Electrical Heat Tracing Design
  • Electrical Load Studies
  • Electrical One Line Drawings
  • Emergency Power Generation
  • Grounding Studies / Details
  • Input/Output (I/O) Lists
  • Lighting Studies & Specification
  • Lightning Protection Design
  • Motor Control Center (MCC) Design & Specification
  • Power System Analysis & Distribution Design
  • Uninterruptible Power Supply (UPS) Design
  • Air Emmission Reduction DesignCause & Effect Matrices
  • Cold Safety Assessment & Mitigation
  • Dust Deflagration/explosion Analyses & Mitigation
  • Emergency Shutdown Procedures
  • Environmental Assessment
  • Facilities / Site Risk Assessment & Mitigation
  • Fire & Flammable Gas Detection Systems
  • Firewater Assessment & Facilities Design
  • Flammable & Toxic Gas Dispersion Modeling
  • Flare Relief System Modeling
  • Hazardous Operation (HAZOP) Review
  • High Integrity Protective Systems (HIPS) Design
  • Plant Risk Assessment
  • Pollution Abatement / Control
  • Pre-Startup Safety Review (PSSR)
  • Process Hazard Analysis (PHA)
  • Process Risk Assessment
  • Safety Instrumented Systems (SIS) Design
  • Safety Integrity Level (SIL) Assessments
  • Safety Relief Review (SRR)
  • Vapor Recovery & Mitigation
  • Wastewater Treatment / Recovery
  • 2D CADD
  • 3D Modeling & CADD
  • Construction Support
  • Construction Work Packages (CWP)
  • Elevation & Plot Plan Drawings
  • Equipment Detail Drawings
  • Equipment Layout
  • Fabrication Support
  • General Arrangement Drawings
  • Laser Point Scanning
  • Location Plans
  • PFD, P&ID, & UFD Drawings
  • P&ID As-Built Walkdown (”Red-Lines”)
  • Piping Design
  • Piping & Equipment Demo Drawings
  • Piping Isometrics
  • Piping Material Control
  • Piping Material Engineering
  • Piping Plans
  • Piping Stress Analysis
  • Piping Tie-Point Locations
  • Planning Studies
  • Plant Layout
  • Point Cloud Survey
  • Vessel / Nozzle Orientations


GRSA Today

GRSA is a full-service, multi-discipline engineering and design services company dedicated to providing quality, safe, cost effective solutions, delivered on time, with exceptional service. For over 45 years we have provided our services to Petrochemical, Pipeline, Specialty Chemical, and Refinery Industries.

We provide a complete range of services from concept and cost estimates through detailed design, procurement, construction assistance, commissioning, on-site design support services, process safety management, and risk based inspection implementation.

Our staff includes experienced personnel in process/chemical, civil/structural, mechanical, piping, drafting, electrical, instrumentation, process safety, and environmental disciplines. Our engineers & designers are uniquely qualified with practical operations & technical roots in the industries we serve. We have extensive experience with all types of chemical & refinery processes including first-of-a-kind technologies.

We work closely with our clients and partners to meet their business goals by providing innovative, cost effective solutions regardless of project size or required services. Our expert staff utilizes state-of-the-art design software to provide optimum design solutions.

Company Founding

(Gary Cadby | George Stucker)

In 1972 George Stucker founded G. R. Stucker and Associates (GRSA). Building on 20 years of process engineering and project management experience, George began GRSA as a specialized provider of Process Engineering and Technical Services.

George graduated from Texas A&M University with a Bachelor of Science Degree in Chemical Engineering in 1951. After graduating George served as a commissioned officer in the US Army for three years.

In 1954 George accepted a Process Engineering position with the Sinclair Refining Company in Houston, Texas. The refinery was one of the earliest full conversion refineries in the United States. George worked at Sinclair for 15 years and attained the position of Technical Division Head.

In 1969 George left Sinclair to work for the PACE Company. PACE was an engineering and construction services company headquartered in Houston, Texas. During his tenure at PACE George held positions of Process Engineering Manager and Project Manager. He left PACE to establish GRSA.

Early Years

GRSA’s first client was the Exxon Baton Rouge Refinery and Chemical Plant, one of the largest and most integrated petrochemical complexes in the world.

Gary Cadby, the current CEO and principal owner of GRSA, was the companies first employee. In 1973 Gary was attending Louisiana State University (LSU) when he applied for a plant job listed in a local newspaper. Gary was interviewed by George Stucker and he accepted a summer internship at GRSA. A year later he accepted a full time position with GRSA. Gary attended LSU part-time and graduated from LSU in 1980 with a Bachelor of Science Degree in Chemical Engineering.

During the 1970’s, GRSA provided chemical engineers and engineering technicians for in-plant services at the Exxon Baton Rouge Complex. The services included production units monitoring & troubleshooting, process safety analysis & mitigation, project screening & feasibility studies, process design basis development & specifications, and turnaround planning & execution.


By the 1980’s GRSA was providing Process Engineering and Technical services to Petrochemical, Refinery, and Specialty Chemical Companies located all along the U.S. Gulf Coast Corridor.

During this time GRSA gained distinction in process safety services, including Process Hazard Analysis (PHA’s), Process Safety Management (PSM’s), and Safety Relief Reviews (SRR’s). GRSA was the exclusive resource for process safety services to one of the largest petrochemical facilities in the U.S.

By the late 1990’s Gary Cadby (current CEO) was managing day to day operations. In 1997 Gary called the Dean of Chemical Engineering at LSU to discuss hiring a new graduate. The Dean recommended Corey Sullivan as one of his top students. Corey accepted a process engineering position with GRSA that same year. Corey later became President of GRSA.

After several years of transitioning management to Gary Cadby, George Stucker retired from the company in 1999.


After years of successful growth, GRSA expanded its services to provide Detail Engineering and Design. The Detail team consisted of experienced Mechanical, Civil, Structural, Electrical, Instrumentation, and Piping Engineers & Designers. Combined with an already strong Process Design Group, GRSA now had the capability to take projects from inception to construction.

Key additions to the Company included Mario DeOliveira in 2005 and Garon Cadby in 2006. Both graduated from LSU in Chemical Engineering. In 2015, Mario was promoted to Vice President and Garon assumed the role of General Manager.

With the new millennium, GRSA was well established as uniquely qualified and experienced Process Engineering and Design firm. GRSA was providing Process Engineering and Design services for all phases of major projects from Conceptual Design through Detailed Engineering and Construction support services. Many of the major projects included plant debottlenecks, expansions, process retrofits, grass-roots designs, and first-of-a-kind technology development.


(225) 291-9988


Looking forward to hearing from you!