Pressure Vessels

Each pressure vessel that we manufacture is per the American Society of Mechanical Engineers (ASME) code. As a leading ASME pressure vessels manufacturer, our specialty lies in working with a variety of alloys, pressures, & designs to meet your custom requirements. More »

Weld Overlay and Clad Vessels

Our weld overlay and clad vessels are fully code-compliant. We use our advanced welding techniques to their full capabilities to offer you the finest overlay/clad components and pressure vessels. More »

High Pressure Vessels

We hold the American Society of Mechanical Engineers (ASME) U, U2, and U3 stamps, and have the capabilities and resources to manufacture ASME high pressure vessel to your exacting specifications. More »


We hold the American Society of Mechanical Engineers (ASME) U, U2, U3, PP, & S stamps, and have the capabilities and resources to manufacture autoclaves to your exacting specifications. More »

Heat Exchangers

We specialize in the design, engineering, and fabrication of Shell and Tube Heat Exchangers, including thermal calculations. All of our units are built in strict accordance with the latest edition and addenda of the A.S.M.E. Code, Section VIII Division 1, 2, or 3 and T.E.M.A.” More »


How to Obtain a National Board R-Stamp for Alterations or Repairs of Steam Boilers

The ‘R’ stamp is issued by The National Board of Boiler and Pressure Vessel Inspectors for the alterations or repairs of steam boilers. This certification helps ensure that such alterations or repairs are only done by capable fabricators who can meet the requirements of the code. In the USA, anyone providing the aforementioned services is required by law to be authorized by the National Board. Additionally, the R-stamp certification is required for companies performing any repair activity on an ASME-certified steam boiler, pressure vessel, and related piping.

Procedure to Get the ‘R-Stamp’ From the National Board

The following steps can be employed when looking to get accreditation by the National Board:

  • Ensure that you and your employees are prepared to be audited. All systems and processes should be in place when applying for accreditation.
  • Contact the National Board for an application form or visit
  • Fill up the form and submit it along with the requisite fees. Process completion from the National Board’s end should take anywhere between 8 to 12 weeks. After which an official survey will be conducted.
  • In the meantime, you can familiarize yourself and your employees on the applicable code sections of ASME and National Board. You can read about the guidelines in a copy of the National Board Inspection Code (NBIC). Make sure to thoroughly read related ASME handbook and codes as well.
  • Visit and look at the list of authorized inspection agencies. Get into a contract with one of these agencies before the survey takes place.
  • Prepare a Quality Control (QC) program in accordance with the codes mentioned in Point 4. In this program, you need to outline standardized processes, as well as identifying employees and subcontractors who can help in accomplishing tasks.
  • Your QC program needs to be verified and approved by an authorized inspection agency.
  • This QC plan will then be verified by Representative of the National Board of Boiler and Pressure Vessel Inspectors. At this time, your authorized inspector and a supervisor from the Authorized Inspection Agency with which you have worked earlier on will need to be present.
  • Upon inspection, this team will either pass or fail your QC program.

You can apply for forms or get more information from the official National Board website:
Alternatively, you can contact them at:
The National Board of Boiler and Pressure Vessel Inspectors,
1055 Crupper Avenue,
Columbus, Ohio
Phone: 614-888-8320

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