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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 is in the process of revising the NB-18 to show Designators instead of Code Sections. All certifications that reference Code Sections remain valid for the Designator referenced in Section XIII.