Oklahoma is one of the most active oil and gas producing states in the country — the SCOOP and STACK plays in the Anadarko Basin, the Arkoma Basin in the east, and a refining and petrochemical infrastructure that runs from Tulsa down through Oklahoma City to the Texas border. Fabricators building high-pressure, thick-walled pressure vessels for Oklahoma’s energy and industrial markets need a heat treating partner who can execute on-site, on schedule, and to code.
If you’re building pressure vessels for Oklahoma’s oil and gas market and need a mobile heat treating partner who shows up, executes clean, and hands you full documentation before they leave — call our owner James Benefield directly at 832-797-3428. He answers calls and texts personally, including short notice and emergency jobs.
Talk to the Owner Directly
James Benefield
Owner, Gulf Coast Combustion
Call or text — James answers personally
No receptionist. No call queue. No waiting on a callback from someone who wasn’t on the last job.
Want a number before you call? Get an instant PWHT cost estimate from real job data — no email required.
Try the Calculator →Oklahoma’s oil and gas industry has been running for over a century — and the pressure vessels being fabricated today for SCOOP/STACK midstream operations, Tulsa refining, and Oklahoma City industrial facilities are more demanding than ever. High-pressure, custom-engineered, ASME Section VIII-compliant vessels that need post weld heat treatment executed correctly the first time.
GCC brings the equipment directly to your facility. Our mobile direct gas fire combustion systems handle vessels of any size, with gas trains running up to 8 million BTU. When a vessel needs post weld heat treatment to meet ASME Section VIII Division 1 requirements, the heat treating vendor either performs — or the whole project stalls. For a breakdown of what those code requirements mean, see our post on PWHT requirements under ASME Section VIII.
Gulf Coast Combustion has already established a presence in southern Oklahoma through our Wichita Falls operations — and we provide full coverage across the entire state. Whether your shop is in Tulsa, Oklahoma City, or anywhere in between, we can get there. Here’s how long on-site PWHT typically takes by vessel size.
No Transport
No oversized load permits. No rigging. No transit risk. Your vessel never leaves your yard.
On-Site QC Witness
Your QC team monitors chart recorder data in real time throughout the entire cycle.
ASME Compliant
Every job executed to ASME Section VIII or your customer-specified WPS and code requirements.
Full Docs Before We Leave
Heat treat record, strip chart trace, calibration certificate, execution plan — complete before GCC trucks leave your yard.
Choosing a Contractor
The gap between a real specialist and someone with the same gas trains doesn’t show on a spec sheet. It shows on the vessel. Here’s how to tell the difference before you hand one your fabrication.
How to Vet a PWHT Contractor →For thick-walled, high-pressure pressure vessels — the kind being built for Oklahoma’s gas processing, midstream, and refining markets — direct gas fire combustion delivers uniform, controllable heat across large surface areas. Our Type K thermocouples with capacitor discharge attachment and NIST-calibrated Chino recorders monitor and document every phase of the cycle. For more on the method, see what direct gas fire heat treating is and why it matters.
We follow ASME Section VIII parameters on ramp rates, soak temperatures, and hold times on every job. Our standard soak temperature is 1,150°F ±50°F. Heat-up and cool-down rates are calculated by wall thickness. Nothing is guessed, and nothing is left undocumented.
On-Site PWHT Pricing
Enter your vessel specs and get a budgetary estimate in seconds, built from GCC’s actual job data. No email required.
Try the Free Calculator →Direct gas fire combustion, on-site, right where the vessel sits. No furnace. No transport. James Benefield is involved in every job.
Time lapse: 621,000 lb vessel, Central Texas. Direct gas fire combustion, on-site.
More From Gulf Coast Combustion
Pressure vessel PWHT is our primary work — but we also provide a full range of industrial heat treating services nationwide.
As Featured In
The Fabricator — North America’s Leading Metal Fabricating Publication
James Benefield wrote the Welding Strategy article in the August 2026 issue: heat treating large pressure vessels where they sit. Four PWHT methods, what actually happens inside the steel, and the point where a furnace stops being an option.
Read James Benefield’s PWHT Article in The Fabricator
Thermal Processing Magazine — The Industry’s Leading Heat Treating Publication
James Benefield wrote the technical article the industry needed someone to write: what on-site direct gas fire PWHT actually requires to get right.
Read the Technical Article
GCC mobilizes throughout Oklahoma, including:
Don’t see your area? GCC mobilizes statewide and nationwide. Call us and we’ll make it work.
Getting a quote from GCC is straightforward. Here’s how it works.
Send us your specs
Drawings are ideal, but vessel weight, length, width, and wall thickness get us started. Email james@gulfcoastcombustion.com or call 713-425-3773.
We price it out
James reviews your specs personally and turns around a quote fast. No waiting on a sales team.
We schedule and mobilize
GCC is available on short notice. If your timeline is tight, tell us up front — we work around fabrication schedules regularly and can mobilize faster than you’d expect.
Full documentation before we leave
Every job includes a complete documentation package: heat treat record, strip chart recorder trace, calibration certificate, and written execution plan. Your QC package is complete before GCC trucks leave your yard.
Ready to Get Started?
Talk to James About Your Oklahoma Project
Call or text the owner directly at 832-797-3428 — or reach the office at 713-425-3773.
Spring, TX to Oklahoma is a manageable run — roughly 6 to 8 hours depending on destination. We’re already operating in southern Oklahoma through our Wichita Falls territory, so we know the route and we’ve made this mobilization before. Call 713-425-3773 or text James at 832-797-3428 to discuss your timeline.
Our mobile equipment handles vessels of virtually any size. We’ve treated vessels over 120 feet long and 600,000 lbs on-site. For Oklahoma oil and gas fabricators building large separators, contactors, and treaters — on-site is almost always more cost effective than furnace transport once you factor in permits, rigging, and transit risk.
Yes, and we encourage it. Your team can monitor chart recorder data in real time throughout the entire cycle. Everything is visible and documented as it happens — no black box, no waiting on paperwork after the fact.
All the time. We walk first-time clients through the full process before the job starts — thermocouple placement, documentation requirements, what to expect during heat-up and hold. No surprises on job day.
Oklahoma’s oil and gas market runs on separators, amine contactors, glycol contactors, treaters, and scrubbers — all high-pressure, thick-walled vessels that need PWHT executed to ASME Section VIII requirements. We’ve treated all of these vessel types and we understand the production schedules that go with them.
For large vessels, yes — almost always. The freight cost on an oversized load from Oklahoma to a furnace shop, plus permits, rigging, and the return trip, adds up fast. Call us with your vessel specs and we’ll give you a number to compare against your current furnace quote.
By the Numbers
Soak Temperature
1,100°F – 1,200°F
GCC standard: 1,150°F ±50°F
Heat-Up Rate
400°F/hr ÷ wall thickness
Never exceeds 400°F/hr
Cool-Down Rate
500°F/hr ÷ wall thickness
Never exceeds 500°F/hr
Max Temp Differential
100°F during soak
250°F during heat-up & cooldown · monitored full length
Thermocouples
Type K
TAU capacitor discharge attachment
Recorders
Chino AH Series
NIST traceable calibration annually
Gas Trains
Up to 8 million BTU
Direct gas fire combustion
Where We Work
Serving Fabricators Across Texas, the Gulf Coast & Oklahoma
Based in Spring, TX. Available Nationwide.
Ready to Schedule Your Oklahoma PWHT Job?
Call or text James directly at 832-797-3428 — or reach the office at 713-425-3773.
Email: james@gulfcoastcombustion.com
View all heat treating services including refractory dry outs, localized PWHT, consulting, and more.
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