National Board Inspection Code (NBIC) 2021. Part 2

The National Board of Boiler and Pressure Vessel Inspectors. — Date of Issue July 1, 2021. — 402 p.The NBIC recognizes three important areas of post-construction activities where information, understanding, and following specific requirements will promote public and personal safety. These areas include:
Installation
Inspection
Repairs and Alterations
The NBIC provides rules, information, and guidance for post-construction activities, but does not provide
details for all conditions involving pressure-retaining items. Where complete details are not provided in this
code, the code user is advised to seek guidance from the Jurisdiction and from other technical sources.
The words shall, should, and may are used throughout the NBIC and have the following intent:
Shall – action that is mandatory and required.
Should – indicates a preferred but not mandatory means to accomplish the requirement unless specified by others, such as the Jurisdiction.
May – permissive, not required or a means to accomplish the specified task.