FAQ

Gulf Coast Combustion specializes in on-site pressure vessel PWHT using direct gas fire combustion — natural gas or propane. We perform more on-site pressure vessel heat treatments per year using direct combustion gas fire than any other mobile heat treating company in the United States. We also perform refractory dry outs, localized PWHT, in-house furnace heat treating, and coating cures. See our full heat treating services.

We’re a focused specialist, not a generalist. Over 95% of our work is on-site gas combustion PWHT on large pressure vessels — it’s what we do every day. You deal directly with the owner, James Benefield, from quote to job completion. We show up when we say we will, execute to specification, and hand you complete documentation before we leave. Our repeat client rate reflects that.

We maintain an active client reference list — fabricators and operators we’ve worked with who can speak to our execution and documentation quality. We’re happy to send it on request. We also encourage first-time clients to have their QC team witness the process on-site from start to finish. Call James directly at 832-797-3428 to talk through any specific concerns before you commit.

We’re based in Spring, TX — in the northwest Houston industrial corridor. Our primary market is the Gulf Coast region, but we mobilize anywhere in the United States. If your project requires it, we go.

Post weld heat treatment is the controlled heating and cooling of a pressure vessel after welding is complete. The goal is to relieve residual stresses introduced into the steel during welding. For pressure vessels, PWHT requirements are governed by ASME Section VIII Division 1, UCS-56. Requirements are triggered by material type, wall thickness, service conditions, and client specifications. For a detailed breakdown, see our Complete Guide to Pressure Vessel PWHT.

For carbon steel pressure vessels, GCC’s standard parameters are: soak temperature 1,100°F–1,200°F (GCC standard 1,150°F ±50°F); heat-up rate 400°F/hr ÷ wall thickness, never exceeding 400°F/hr; cool-down rate 500°F/hr ÷ wall thickness, never exceeding 500°F/hr; maximum temperature differential during soak 250°F. Every job is executed to ASME Section VIII or your customer-specified WPS — whichever is more stringent.

Every job includes a complete documentation package: heat treat record (HTR), strip chart recorder trace showing heat-up rate, hold temperature, hold time, and cool-down rate traceable to specific weld seams, NIST-traceable calibration certificate for our recorders, and a written execution plan. This package is complete and in your hands before GCC trucks leave your yard.

On-site PWHT means we bring the equipment to your vessel — no transport, no oversized load permits, no rigging, no furnace scheduling. For large pressure vessels over 30,000 lbs or with an oversized footprint, on-site is almost always the more practical and cost-effective choice. Your vessel stays on your floor, your QC team witnesses the process, and your schedule stays on track.

Yes. GCC develops a custom execution plan for every job — documenting the vessel ID, governing code, soak temperature, hold time, thermocouple placement, burner assignment, and all technical specifications. The plan is submitted to the client for approval before work begins.

Yes, and we encourage it. Since the work is performed at your facility, your QC team can monitor chart recorder data in real time throughout the entire cycle — heat-up, hold, and cool-down. No travel required.

Yes. Direct gas fire combustion is our specialty for large pressure vessel PWHT — it’s the most practical and cost-effective method at that scale. For smaller, more targeted applications like flange faces, nozzle welds, and pipe spool repairs, we perform localized PWHT using electrical resistance heating — the appropriate method for those applications.

Our mobile equipment handles vessels of virtually any size. We have treated vessels over 100 feet long and 600,000 lbs on-site. There is no practical upper limit — if the vessel exists, we can heat treat it. For smaller components, we also have an in-house furnace in Spring, TX handling up to 25,000 lbs.

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 the day of the job.

Yes. Some jobs require thinking outside the box. Clients who can supply their own natural gas on-site can save significantly on fuel costs. Clients with 480v power available can save on generator costs. We’ll always tell you what options exist to keep your costs in line. We also offer heat treating consulting for projects that need a custom approach.

Drawings are ideal, but vessel weight, length, diameter, and wall thickness get us started. Email james@gulfcoastcombustion.com or call 713-425-3773. James reviews specs personally and turns around quotes fast — same-day verbal estimates are common.

We typically request 48 hours to schedule labor, equipment, and materials — but we understand that’s not always possible. For Houston-area jobs, mobilization can happen within days. If your timeline is tight, tell us upfront. We work around fabrication schedules regularly and can move faster than you’d expect.

We’d be happy to — it’s actually our preferred method for larger jobs. Seeing the vessel and the work space in person gives us a better picture of what’s needed and lets us plan more accurately. It’s also a chance to meet before the job starts, which we think matters.

Yes. We can rent or sell equipment to clients. Contact us at 713-425-3773 for rates and availability.

We’re always looking for qualified heat treating technicians. Call 713-425-3773 or visit our Jobs page to inquire about current opportunities.