NATIONAL BOARD BOILER AND PRESSURE PORTABLE
NATIONAL BOARD BOILER AND PRESSURE CODE

The National Board, its members, and employees assume no liability for the use or misuse of any information contained herein. However, this data is subject to change without notice and is neither guaranteed nor warranted. Every effort has been made to make the information contained within NB-18 as accurate and complete as possible. Installation, operating conditions and manufacturers recommendations must be considered in selecting a pressure relief device for service. The National Board has not tested each production device and makes no certification regarding its capacity, manufacturer, or application. Since the listed rating values were determined under atmospheric pressure discharge conditions, the calculated capacities may not be valid when discharge back-pressure conditions exist. Such capacities are certified only for the conditions under which obtained. This publication is updated weekly and is available free of charge from the National Board Web site, The capacity rating values listed were determined from tests of samples of the relevant pressure relief device type at a National Board accepted testing laboratory under ideal conditions. Information on these devices may be obtained by contacting the National Board Pressure Relief Department.

Companies which no longer hold certifications or device design certifications which are no longer in production are not listed.

NATIONAL BOARD BOILER AND PRESSURE PORTABLE

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NATIONAL BOARD BOILER AND PRESSURE CODE

This publication also includes a listing of organizations which have received a National Board certificate of authorization for the use of the VR repair symbol stamp in accordance with the National Board Inspection Code publication, NB-23 and NB-514, Accreditation of VR Repair Organizations. 761ДЇOREWARD This publication presents the National Board pressure relief device certification program and lists those device designs certified and those organizations authorized to apply the National Board NB symbol to devices of certified types.

LISTING OF TESTING ORGANIZATION CERTIFICATE HOLDERS. LISTING OF RUPTURE CCFs BY VALVE MANUFACTURER. LISTING OF ASSEMBLER AND MANUFACTURER CERTIFICATIONS. 2ДETERMINATION OF CERTIFIED RELIEVING CAPACITIES. NATIONAL BOARD PRESSURE RELIEF DEVICE CERTIFICATION. National Board Pressure Relief Device CertificationsДЇOREWARD.

National board boiler and pressure