Anneal — Field PWHT Contractors. Every Degree Recorded.

ASME B31.3 · API 582 · AWS D1.1 Certified Field Crew

1204°C

Soak Temperature

Every layer documented. Every degree recorded.

Anneal deploys field-certified PWHT crews to pipeline tie-ins, refinery turnarounds, and structural connections — wrapping every joint, placing every thermocouple, and delivering a PE-stamped report before your inspector leaves the gate.

Send Us Your Weld Map See the Process →

12,000+

Joints Completed

14-Day

Turnaround Windows

100%

Documentation Rate

Failed Inspections

Live Recorder● Recording

Ramp 150°F/hr1204°C / 1h hold

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The Controlled Ramp

Five stages.
Five artifacts.

Every PWHT job follows the same controlled sequence. We show you the artifact from each stage — not because we have to, but because it's the only way to prove the work was done right.

Mobilization

Thermocouple Mapping

Our crew arrives with calibrated Type-K thermocouples, attachment hardware, and a joint-specific layout sketch pre-drawn from your isometric. Every TC placement is documented before the blanket goes on.

TC placement per AWS D10.10Weld map cross-referenceInspector sign-off

AmbientMobilization target

TC Layout Sketch● Mobilization

Delivered to QC before heat-up

Ramp Programming

Controller Setup & Ramp Rate

The heat treatment controller is programmed with your code-specified ramp rate — typically 150–300°F/hr for carbon steel, custom for P91 and chrome-moly. The program is printed and attached to the job package before energizing.

ASME B31.3 Table 331.1.1Customer spec override acceptedDigital + paper record

150°F/hrRamp Programming target

Ramp Program Printout● Ramp Programming

Signed by crew lead, filed to job package

Soak Hold

Temperature Hold Monitoring

All five thermocouples must reach and hold the specified soak temperature within the tolerance band — typically ±25°F. The recorder runs continuously. If any TC falls out of band, the hold timer resets automatically.

±25°F band enforcementAuto-reset on band exceedanceContinuous recorder trace

1204°C holdSoak Hold target

Hold-Time Certificate● Soak Hold

Signed by Level II PWHT technician

Controlled Cooldown

Cooldown Slope Overlay

Cooldown is not passive. The controller manages descent rate per code — 300°F/hr maximum for most P-numbers — until the joint reaches 600°F, at which point the blanket is removed and air cooling completes the cycle.

Code-controlled descent600°F blanket-off thresholdDeviation auto-flagged

300°F/hr maxControlled Cooldown target

Cooldown Slope Overlay● Controlled Cooldown

Overlaid on recorder chart, deviation-flagged

Documentation Delivery

PE-Stamped PWHT Report

Within 24 hours of cooldown, you receive the complete PWHT package: the recorder chart with all TC traces, the hold-time certificate, the cooldown overlay, the TC layout sketch, and the final report with PE stamp — ready for your code inspector.

PE stampAll TC tracesHold certificateCooldown chartWeld map reference

ReportDocumentation Delivery target

Complete PWHT Report● Documentation Delivery

PE-stamped, inspector-ready, 24hr delivery

Engineering Review

Download a real
PWHT report.

Before you recommend a PWHT contractor to procurement, you need to see the documentation. This is an unredacted report from a 2024 pipeline tie-in — full recorder traces, thermocouple layout, hold certificate, cooldown overlay, and PE stamp.

All 5 thermocouple traces overlaid

Hold-time certificate with band data

Cooldown slope vs. code limit

PE stamp, TX license #TX-48291

Ready to submit to your code inspector

Get the sample report

Engineering access only — no sales follow-up.

What We Heat Treat

Four project types.
One documentation standard.

Whether you're closing a DOT-regulated mainline or qualifying a pressure vessel weld for NBIC inspection, the report you receive looks the same: complete, stamped, and ready for your code inspector.

Pipeline construction workers welding a large diameter pipe joint in open field

8,400+

Pipeline joints

DOT-regulated mainline connections

Pipeline Tie-Ins

We mobilize to remote right-of-way within 48 hours. Every tie-in joint gets a dedicated thermocouple layout, a controller program matched to your P-number, and a PWHT report your DOT inspector will accept on first submission.

API 5L X52–X80ASME B31.4 / B31.8DOT Part 192/19548-hr mobilization

Refinery piping network with complex pipe connections and industrial equipment at dusk

14-Day

Turnaround windows

14-day windows, 100+ joints

Refinery Turnarounds

Turnaround schedules don't flex. We staff multiple controller crews, run parallel joints simultaneously, and deliver documentation daily so your QC team never waits on paperwork to close a joint.

ASME B31.3 ProcessP91 / P22 Cr-MoParallel crew capabilityDaily doc delivery

Steel structural beam connection with visible weld joints on a construction site

1.5"

Wall thickness handled

Heavy wall, high-consequence

Structural Connections

When a structural engineer specifies PWHT on a heavy wall connection, residual stress is the concern. We place thermocouples at the weld toe, not just the crown, and hold the soak until all points confirm.

AWS D1.1 / D1.5Heavy wall ≥1.5"Weld toe TC placementResidual stress protocol

Industrial pressure vessel with insulation wrapping and pipe connections at a chemical plant

100%

NBIC compliant

ASME Section VIII shop & field

Pressure Vessels

Pressure vessel PWHT demands uniform temperature across the entire shell, not just the weld seam. We use extended thermocouple arrays and overlap the heated zone by code-minimum distances on all sides.

ASME Sec. VIII Div. 1UCS-56 table complianceShell + nozzle zonesNBIC documentation

Start a Job

Send us your
weld map.

Upload your isometric or weld map and we'll return a thermocouple layout sketch and mobilization estimate within one business day — before any PO is signed.

Direct Line

(432) 555-0178

Mon–Fri 6AM–6PM CT

ops@anneal-pwht.com

Response within 4 hours

Service Area

Permian Basin & Gulf Coast

Nationwide mobilization available

Five stages.Five artifacts.