TTT Technical Resources

Technical information. Installation resources. Real-world applications.

Access Tuff Tube Transition product information, installation resources, technical literature and project information for TTT connection technology.

Video library

Technical videos & case studies

A sequenced view of the technology: product overview, shop fabrication, field execution and a real-time fit-up demonstration. Each video opens in place.

Introduction to Tuff Tube Transition

An overview of Tuff Tube Transition, its products, and the problems its patented solutions are designed to solve.

Header Integrity Program: Shop Fabrication

Shop fabrication of the Wise County headers as part of TTT's Header Integrity Program.

Case Study: Wise County Header Replacement

Field installation and replacement of the Wise County headers using TTT connection technology.

TTHC & TTPS Real-Time Fit-Up Demonstration

A real-time demonstration of the TTHC and TTPS preparation and fit-up process.

Technical resources

Technical information

Tube-to-Header Connection

TTHC — Recommended Installation Practices

Recommended sequence for tube and header preparation, TTHC positioning, insertion and alignment verification, welding sequence and QC / VT hold points.

References
ASME Section I • ASME Section IX • NBIC Parts 2 & 3
Designator
R2 Alteration • GTAW / GTAW Orbital
PDF — Rev. 2

Tube-to-Tube Connection

TTPS — Recommended Installation Practices

Recommended sequence for tube preparation, TTPS positioning and fit-up verification, root welding, fillet / cap welding and QC / VT hold points.

References
ASME Section I • ASME Section IX • NBIC Parts 2 & 3
Designator
R2 Alteration • GTAW / GTAW Orbital
PDF — Rev. 2

Engineering support — available on request

Engineering drawings, dimensional drawings, calculations, Finite Element Analysis reports and project-specific engineering documentation are not publicly downloadable. Contact TTT so the appropriate information can be reviewed and supplied for the application.

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Product literature

Download center

Front cover of the Tuff Tube Transition brochure, Revision 8

PDF · Rev. 8 · Current brochure

Current TTT brochure

Overview of the TTT product family, applications and capabilities — TTHC tube-to-header connections, TTPS tube-to-tube connections and Tuff Plug, with installation context and field performance detail.

View / Download Brochure
VSConventional

Conventional vs TTT

See the TTT Difference

Compare conventional welded repair with engineered TTT connection technology — including welding methodology, FEA, field evidence and comparative project economics.

Explore the comparison

Case studies

Proven in the field

Replacement RH1 lower reheat header with TTHC connections installed

Header Integrity Program

Wise County — RH1 lower reheat header

Engineered replacement header built around the TTHC connection, fabricated, delivered and installed during the outage window.

Read case study
HP economizer tube bank at EDF Bouchain with TTT connections installed across multiple rows

HP Economizer TTHC Installation

EDF Bouchain CCGT — France

Following recurring HP economizer tube-to-header leaks, EDF Bouchain implemented TTT connection technology as part of its reliability strategy. Explore the project, installation photography, customer evidence and independent Combined Cycle Journal coverage.

View EDF Bouchain project

Customer testimonials

Written customer references

Full written customer references from documented TTT projects.

Customer reference — reheat header replacement

Vistra Energy — Wise County Plant, Texas, USA

Tyler Wensel, Maintenance Manager

  • 53% stronger connection
  • 5-day installation
  • 150+ starts

“Following up from our Spring outage, I wanted to thank you and your team at Viking for engineering, constructing, and installing new reheat headers. I appreciate the attention to detail when it came to the Finite Element Analysis (FEA).

I was surprised to learn that the tube to header connection designed by Viking was 53% stronger than the OEM connection. We received proposals from competitors with conventional installation methods that averaged installation times for 6-8 weeks. The Viking team was able to install these headers in 5 days. Finding contractors that can complete work within our original outage window is paramount in the ERCOT market. I look forward to using Viking for additional repairs, and replacements in the future. To date we have over 150 starts, and a significant amount of baseload operation without a single failure since installation. We have conducted two inspections since installation, and there are no signs of premature failure, or unanticipated wear / stress.”

Tyler Wensel

Maintenance Manager

Vistra Energy, Wise County Plant, Texas, USA

Customer reference — HP economizer TTHC installation

EDF Bouchain CCGT — France

Guillaume Grognet, Maintenance Mechanical Manager

Bouchain, November 6th 2024

  • 204 TTHCs installed
  • 8× expected life

“Reference letter: Tuff Tube Transition solution by Viking Vessel.

As Bouchain CCGT Mechanical Manager, I am writing this letter to recommend services and TTT solution from Viking Vessel.

We are installing, with onsite Viking Vessel QA and QC support, 204 TTHC on a highly stressed HP economizer following several leaks occurring in operation last year. I can recommend Viking Vessel for their high level of commitment and professionalism in the design and on field services. They proposed to Bouchain power plant a solution tailored to the need in a very short time. Thanks to this solution, the life span of the exchanger is expected to be 8 times more, compared to the original design.”

Guillaume Grognet

Maintenance Mechanical Manager

EDF — Bouchain CCGT, France

Industry coverage

Tuff Tube Transition in Combined Cycle Journal

Tuff Tube Transition technology has been featured in Combined Cycle Journal through technical features, advertising and independent editorial coverage of real-world HRSG applications.

In the spotlight

TTT Featured in Combined Cycle Journal

Issue 75 (2023) · Page 27

Published by Combined Cycle Journal

Editorial

Independent editorial

European HRSG Forum Coverage

Issue 84 (2025) · EDF / European HRSG Forum article pages 48–55 · TTT advertisement pages 43–46

Published by Combined Cycle Journal

TTT campaign

Four-Page Tuff Tube Transition Feature

Issue 85 (2026) · Pages 55–58

Published by Combined Cycle Journal

Tuff Tube Transition connections installed across an HP economizer tube bank

Customer case study

EDF Bouchain — TTT in a real-world HRSG application

Combined Cycle Journal covered the EDF Bouchain project twice: in its reporting from the 2025 European HRSG Forum presentation, and in a dedicated case study on the HP economizer tube leaks at the Bouchain CCGT. Both are independent editorial articles published by Combined Cycle Journal, not TTT advertising.

Protected technology

Patented connection technology

Tuff Tube Transition technology is protected by granted patents in multiple jurisdictions, with additional international patent activity.

View patent information

Need a drawing, technical document or application information?

Contact TTT with your application or project requirements and we can help identify the appropriate technical information.