NBIC-Part-2-Inspection-2015.pdf | Boiler | Building Engineering NB-23 2015 NATIONAL BOARD INSPECTION CODE 2015 EDITION DATE OF ISSUE — JULY 1, 2015 This code was developed under procedures accredited as meeting the criteria for … NBIC-Part-2-Inspection-2015.pdf | Boiler | Building Engineering NB-23 2015 NATIONAL BOARD INSPECTION CODE 2015 EDITION DATE OF ISSUE — JULY 1, 2015 This code was developed under procedures accredited as meeting the criteria for …