National Board Inspection Code


The National Board Inspection Code (NBIC) was first published in 1946 as a guide for chief inspectors. It has become an internationally recognized standard, adopted by most US and Canadian jurisdictions. The NBIC provides standards for the installation, inspection, and repair and/or alteration of boilers, pressure vessels, and pressure relief devices.

NBIC Requests

The NBIC Committee meets regularly to consider written requests for interpretations and revisions/additions to the code rules. All requests are reviewed by National Board staff before being submitted to the committees for their consideration. Any additional information or attachments that cannot be provided in the online request form should be emailed to the NBIC Secretary at

Basic tracking information is provided for all requests you submit for committee consideration. If you have any questions about the status of an action item, please contact the NBIC Secretary.

Tutorial for Submitting Action Item Requests

NBIC Committee Members

NBIC Action Items

View basic information for all open and closed action items and interpretation requests for each NBIC committee.

NBIC Balloting

All active ballots for committees of which you are a member, as well as an archive of all previous letter ballots can be found here. Project managers for items being balloted will view and respond to ballot comments here as well.