NB Mark. The NB mark is used by manufacturers to identify items registered with the National Board. It is also 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.

NB Symbol and National Board registration number. CR-4.1 The NB Symbol shown on the nameplate illustrated below is the official National Board Mark which denotes registration of the pressure-retaining item with the National Board. The National Board registration number is the manufacturing organization’s sequential

ASME Mark for PRDs, Alt. Marking Methods NB-18, Pressure Relief Device Certification Test Lab Data

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.

Apr 15, 2025 · The NB mark is used by manufacturers to identify items registered with the National Board. It is also 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 .

Feb 29, 2024 · NB stands for niobium, which is a metal. While niobium isn't the least expensive of metals used in jewelry, it is much more affordable than gold and platinum and is a tad more expensive than silver. Niobium is highly durable and scratch resistant but yet very lightweight making it easy to wear.

Registered pressure relief devices are stamped with a National Board NB Mark. For the manufacturer, data reports provide a form of customer service over the life of the equipment. Since 1921 there have been over 45 million data reports registered with the National Board. [2]

This policy establishes requirements for the authorization of organizations to use National Board marks or symbols.

NB Mark Certificate of Authorization for pressure vessels and/or pressure retaining items in accordance with ASME “U” Code Stamp.

The NB mark is used by manufacturers to identify items registered with the National Board. It is also used by pressure relief device manufacturers and assemblers to identify pressure relief devices that have been certified by the National Board.