NB-18 includes a listing of the following:
- Manufacturer and Assembler Certifications
- Certified Device Types by Manufacturer
- Rupture Disk Combination Capacity Factors by Valve Manufacturer
- VR Certificate Holders
NB-18 is updated monthly and is presented in a PDF file.
| 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. |
For a dial-up internet connection: users may view the NB-18 files through the browser, allowing faster access to the publication.
- Click on View link below.
- The Table of Contents will appear in browser window. Navigating through the documents reveals clicking on any blue text field will access a related document or table.
Please note that this file will remain on the National Board's Web server and a copy will not be downloaded to user's hard drive.
Online users with Acrobat Reader 7.0 and above may experience some problems linking between related documents within NB-18. If you are experiencing this type of problem, we recommend that you use the DOWNLOAD link (below) to install the PDF's to your local PC where the links will function normally.
VIEW NB-18
For high-speed internet connection: you can download the entire NB-18 publication to your hard drive by following the instructions below.
Please note that this file is approximately 6 Mb in size and may take up to 35 minutes to download if not using a high-speed connection.
- Click on Download link below.
- Choose the Save button within your browser's dialog box.
- Browse for the directory where you choose to save the zip file to your computer. Click Save.
- The file will take several minutes to download to your computer.
The following directory structure will be created in the location you have chosen:
NB18 (directory)
NB18ToC.pdf
NB18pdfs (sub-directory)
- NB18Forward.pdf
- Manufacturers and Assemblers Index.pdf
- Design Name Index.pdf
- NB Number Index.pdf
- Rupture Disk CCFs listed by Valve Manufacturer.pdf
- VR Certificate Holders.pdf
- Certification Tables.pdf
Click on NB18ToC.pdf (The Table of Contents file) to begin navigation. As you navigate through the documents, you will see that clicking on any blue text field will take you to a related document or table.
DOWNLOAD NB-18