• Pressure Relief Device Certification
  The “NB” mark must be used by pressure relief device manufacturers and assemblers to identify pressure relief devices that have been certified by the National Board in accordance with NB-501, National Board Certification of Pressure Relief Devices
• “VR” Repair Program
  The National Board offers the Certificate of Authorization and “VR” Symbol Stamp for the repair of pressure relief valves. Requirements are included in the 2007 edition of the National Board Inspection Code (NBIC), Part 3, Section 1.
• Investigation Testing
  The National Board supports members who request tests be conducted on pressure relief devices involved in boiler and pressure vessel accidents. This service is provided at no cost to the National Board member.

• ASME Designee – Shop Reviews
  The National Board is the ASME designee to conduct shop reviews of organizations for the “V,” “UV,” and “HV” code symbol stamps.
• ASME Designee – Valve Selection and Test Witnessing
  Representatives from the National Board are assigned to visit company sites to select production sample valves for testing at National Board- and ASME- accepted labs.
• ASME Designee – Laboratory Acceptance
  Staff from the National Board will evaluate testing laboratories for compliance with the ASME Standard PTC – 25 to conduct performance tests of pressure-relieving devices. To see a list of accepted test labs, click here.

• ASME Subcommittee on Safety Valve Requirements
• ASME Subgroup on Pressure Relief Valves (Section III, Nuclear)
• NBIC Subgroup Pressure Relief Devices
• ISO/TC 185, international committee concerned with overpressure protection
• U.S. Technical Advisory Group on ISO/TC 185

For more information regarding the National Board Pressure Relief Department,
please Contact Us.