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NB-18, Pressure Relief Device Certification




NB-18 includes a listing of the following:

  • Assembler and Manufacturer Certifications
  • Certified Device Types by Manufacturer
  • Rupture Disk Combination Capacity Factors by Valve Manufacturer
  • VR Certificate Holders
  • T/O Testing Organization Certificate Holders

NB-18 is updated weekly and is presented in a single PDF file. Users may view NB-18 through their browser by clicking on the View link above. The first page is a Table of Contents with links to all the various listings. The top right corner of each page has a link back to the Table of Contents. If your PDF viewer has a Bookmarks feature (not to be confused with bookmarks for your web browser), you can also open a Bookmarks panel with a list of links to each of the companies under each section. Some versions of Internet Explorer will open the Bookmarks panel automatically when the PDF is opened.



To download NB-18 to your computer, open the document by using the VIEW link above, and then use the Save or Save As feature of your PDF viewer.


NOTE: This electronic version of Pressure Relief Device Certifications is produced under the copyright of The National Board of Boiler and Pressure Vessel Inspectors. It may be downloaded and printed for professional reference only. This product is not to be reproduced for the purpose of commercial distribution.




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