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• A listing of VR and T/O Certificate Holders can be found in the Manufacturer & Repair Directory
• Click Here for A listing of Rupture Disk Combination Capacity Factors (CCF’s) by Valve Manufacturer
• Download Full NB-18 PDF

***Note: With the publication of ASME Section XIII, the National Board revised NB-18 on January 2022 to refer to Designators instead of Code Sections. All Certifications that reference Code Sections remain valid for the equivalent Designators.