Built for the work that has to be right the first time.
Code-quality execution. Field-proven crews. Documentation that stands up to review.
A Reputation
for Performance
For 30+ years, Associated Technical Support Services has delivered code-quality welding, pipe fitting, and NDE to the refining and petrochemical facilities that power Louisiana and Oklahoma.
Experienced
Three decades of hands-on piping and mechanical work across the toughest jobs in Louisiana and Oklahoma.
Quality-Driven
Documented QA/QC on every weld and fit-up — work that stands up to code and audit.
Safety-First
A culture built so every crew member goes home safe, every single day.
Built on precision.
Trusted for performance.
For 30+ years, Associated Technical Support Services, LLC has delivered code-quality piping and mechanical work to some of the most demanding industrial facilities in the country.
What started as a small crew of welders and pipefitters has grown into a full-service piping and mechanical contractor with a reputation built the hard way — one quality weld, one safe shift, and one satisfied client at a time. Today, ATS is trusted by refineries, petrochemical facilities, and industrial plants for work that has to be right the first time.
ATS operates from three core locations spanning two states — Port Allen, Louisiana, Houma, Louisiana, and Tulsa, Oklahoma. Each is a fully staffed hub with its own certified welders, pipefitters, and NDE technicians, giving clients direct, local access to our crews throughout the Gulf Coast and Mid-Continent regions.
Our capabilities cover the full scope of piping and mechanical work — welding, pipe fitting, non-destructive examination, mechanical installation and maintenance, field inspection, and QA/QC documentation. Every job is executed to code and backed by traceable records that stand up to owner and third-party review. That combination of skilled hands, disciplined process, and a safety culture that never takes a shortcut is what has kept ATS in business for three decades — and what will keep us here for the next one.
Our Services
Full-scope piping and mechanical capabilities, delivered by crews who work to code and document every step.
Welding
Certified welding across carbon steel, stainless, and alloys — from small-bore tie-ins to large-diameter process piping. National Board R Stamp and ASME S Stamp authorized.
Pipe Fitting
Precise layout, fit-up, and installation of process piping systems and spools — accurate to isometrics and ready for inspection.
Learn moreNDE
Non-destructive examination to verify weld and material integrity — catching issues before they reach service, with documented results.
Learn moreMechanical
Mechanical installation, maintenance, and equipment work that keeps plant systems running through operations and turnarounds — including R Stamp-authorized pressure vessel and boiler repair.
Inspection
Field inspection that confirms work meets specification and code — giving owners confidence in every system we touch.
Learn moreQA / QC
Quality assurance woven through the whole job — traceable documentation, weld maps, and records that stand up to audit, backed by our R Stamp and S Stamp quality control programs.
Safety is the standard, not the goal
Every job starts and ends with people going home safe. Our field culture is built on disciplined planning, proper PPE, and continuous training — because in piping and mechanical work, safety and quality are the same commitment.
- Job-specific safety planning
- Ongoing crew training
- Full PPE compliance
- Documented QA/QC records
Industries Served
We support the facilities that anchor the industrial economies of Louisiana and Oklahoma — bringing the same standard to every sector.
Refining
Piping and mechanical support for refinery units, maintenance, and turnarounds.
Petrochemical
Process piping systems and mechanical work for chemical and petrochemical plants.
Oil & Gas
Fabrication and field services for upstream, midstream, and downstream facilities.
Power & Energy
Piping and mechanical services supporting power generation and energy infrastructure.
Industrial & Fabrication
Shop and field fabrication of spools and structures for industrial facilities.
Marine & Gulf
Piping and mechanical support for coastal and marine-adjacent facilities along the Gulf Coast.
Common Questions
What services does Associated Technical Support Services provide? +
ATS provides welding, pipe fitting, non-destructive examination (NDE), mechanical installation and maintenance, field inspection, and QA/QC documentation for refining, petrochemical, and industrial facilities.
What certifications does ATS hold? +
ATS is authorized under the National Board R Stamp and the ASME S Stamp, covering certified welding and repair work on pressure vessels and boilers.
What areas does ATS serve? +
ATS operates from three locations — Port Allen, Louisiana; Houma, Louisiana; and Tulsa, Oklahoma — serving refining, petrochemical, and industrial clients across the Gulf Coast and Mid-Continent regions.
How long has ATS been in business? +
Associated Technical Support Services, LLC has delivered code-quality piping and mechanical work for 30+ years.
What industries does ATS work with? +
ATS supports refining, petrochemical, oil & gas, power & energy, industrial & fabrication, and marine & Gulf Coast facilities.
How do I request a quote from ATS? +
Fill out the quote request form on this page, email Contact@ATSNDE.com, or call any of our three locations directly. Our team follows up within one business day.
Let's talk about your scope
Reach out to any of our three locations and our team will follow up within one business day.
Port Allen, LA
- 1664 E Hugh Loop Road
Port Allen, LA 70767 - 225-425-6867
Houma, LA
- 539 S. Hollywood Rd.
Houma, LA 70360 - (985) 873-6064
Tulsa, OK
- 8507 S. Regency Dr.
Tulsa, OK 74131 - 801-865-7195