When your operation depends on a vessel performing safely under pressure, you cannot afford uncertainty. Boardman LLC has held the ASME Section VIII, Div. 1 “U” Stamp since 1952 and has built a reputation for excellence since 1910. Your most demanding ASME pressure vessel modification projects have found a home here. Whether you need a single nozzle added or a full re-rating of an aging asset, your vessel’s certification and your team’s safety never leave our focus.
Any physical change to a pressure vessel, whether that’s adding a nozzle or changing design parameters, must comply with the vessel’s original code of construction. Under ASME Section VIII and the National Board Inspection Code (NBIC), these changes require:
Your vessel’s “U” stamp integrity is not a technicality; it is the foundation of your facility’s insurance coverage, regulatory standing, and your workers’ safety. Boardman ensures that foundation stays solid through every pressure vessel modification we perform.
You bring the challenge, and our certified team brings the solution. Our pressure vessel modifications include:
You also get to define your level of involvement. Boardman can manage your vessel modification from engineering through final documentation, or we can work from your own drawings and specifications. The project runs the way that works best for you.
Boardman provides field ASME pressure vessel alterations and modification services across the following states:
Need modification services outside these areas?
Reach out now, we are happy to discuss your project location and determine the best path forward.
Boardman is not simply a vendor you hire for a job. We are a partner you trust with assets that your entire operation depends on. Our R Stamp-authorized team brings certified welders, proven compliance processes, and respect for your timeline and budget to every project. Whether we lead the full scope or work from your drawings, the level of involvement is always your call.
Your project deserves clear answers before work begins. Here are the questions our clients in oil and gas, chemical processing, and power generation ask most when planning a pressure vessel modification.
Yes, under the National Board Inspection Code (NBIC), any alteration to a pressure vessel must be performed by an organization holding a valid “R” Stamp certificate. This ensures your ASME pressure vessel modification is fully documented, AI-approved, and compliant with the vessel’s original code of construction. Boardman LLC carries this certification, so your project is protected from day one.
A repair restores a vessel to its original design condition, replacing worn or damaged material in kind. An alteration (or vessel modification) changes the vessel from its original design by adding a nozzle, re-rating the pressure, or extending the shell. Alterations require more rigorous engineering review, AI involvement, and Form R-1 documentation under NBIC. Both require “R” Stamp authorization.
In most cases, yes. The NBIC requires hydrostatic or pneumatic testing following ASME pressure vessel alterations to verify post-modification integrity. The test method and pressure parameters are determined by engineering review and AI approval. Boardman manages this entire process for you.
Yes. Boardman provides field pressure vessel modifications across Oklahoma, Texas, New Mexico, Colorado, Arkansas, Missouri, and Kansas. Our field crews carry the same certifications and follow the same ASME and NBIC compliance standards as our shop operations because your vessel’s safety does not change based on geography.
Boardman LLC has been the trusted name in pressure vessel fabrication and modification since 1910. Your next project deserves that same standard of excellence.