The National Board Inspection Code (NBIC) - NB23 - 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.
The NBIC is organized into four (4) Parts to coincide with specific post-construction activities involving pressure-retaining items.
Part 1, Installation – This Part provides requirements and guidance to ensure all types of pressure-retaining items are installed and function properly. Installation includes meeting specific safety criteria for construction, materials, design, supports, safety devices, operation, testing, and maintenance.
Part 2, Inspection – This Part provides information and guidance needed to perform and document inspections for all types of pressure-retaining items. This Part includes information on personnel safety, non-destructive examination, tests, failure mechanisms, types of pressure equipment, fitness for service, risk-based assessments, and performance-based standards.
Part 3, Repairs and Alterations – This Part provides information and guidance to perform, verify, and document acceptable repairs or alterations to pressure-retaining items regardless of code of construction. Alternative methods for examination, testing, heat treatment, etc., are provided when the original code of construction requirements cannot be met. Specific acceptable and proven repair methods are also provided.
Part 4, Pressure Relief Devices – This Part provides information and guidance to perform, verify, and document the installation, inspection, and repair of Pressure Relief Devices, including a supplemental section that contains specialized information, such as pressure margins, recommended repair practices, and test stand design details.
Summary of Major Changes:
Part 1:
- Revisions to 1.6.10 to add additional details/specifications for Testing and Final Acceptance.
- New requirements to remove covers, caps, plugs, wires, or restraining devices used for shipping/transporting pressure relief valves prior to a valve’s installation [paragraph 2.9.1 g) and h), 3.9.1 a) and b)]. These requirements are also included in Part 4, 2.2.1 g) and h) and 2.4.1 a) and b).
- New rating requirements for discharge piping and fittings [paragraph 3.9.1.5 c), d), and e)].
- Revised carbon dioxide gas detection system requirements for Liquid Carbon Dioxide storage vessels (section S3.4).
- Updated overpressure protection requirements for Thermal Fluid Heaters (section S5.7).
- New Supplement 8 for Installation of Pressure Vessels for Human Occupancy (PVHOs)
- New Supplement 9 for High-Temperature Water Boilers
Part 2:
- New requirements for remote visual inspection for confined space entry [paragraph 1.4.1 c), 4.2.1 c)].
- Several revisions/updates to the inspection requirements for PVHOs (section 2.3.6.8).
- New inspection requirements to ensure all shipping caps, plugs, covers, wires, and or restraining devices were removed during the installation process [paragraph 2.5.4 a)]. These requirements are also included in Part 4, 3.2.3 a).
- Part 2, 2.5.8 has been restructured into a tabular format.
-New requirements to allow for long NDE cycles for Historical Boilers [paragraph S2.7.3.2 c)].
-New MAWP requirements for Return Flue Boilers (section S2.10.3.1).
-Several updates and revisions to Supplement 10 (S10.5 c), S10.7 c), Table S10.7-a, Table S10.7-b, S10.8 c) 5) and 8), S10.10.5, and Figure S10.10.5).
-Revised carbon dioxide gas detection system requirements for Liquid Carbon Dioxide storage vessels (section S12.5).
Part 3:
- R-Forms and directions for completing them have been moved to a new Supplement 9.
- Revised language to clarify Quality Assurance Program requirements [paragraph 1.6.3 a) and b)].
- Several revisions to Table 2.3 to only show the most recent edition of an SWPS. New language is included in Section 2.3 c) to allow the use of previous versions of the SWPSs listed in Table 2.3.
- New section detailing requirements on Welding Method 7 (section 2.5.3.7).
- New language specifying that routine repairs are not permitted for ASME Section VIII, Div.2 or Div. 3 vessels [paragraph 3.3.2 a)].
-New requirements for flush patches in stayed and unstayed areas of tubesheets [paragraph 3.3.4.6 a)].
- New Section 3.3.6 for Pressure Vessel Impact Testing.
- New language that allows for the engineer review and certification process for alteration plans to be waived [paragraph 3.4.5.1 a)]. This change applies to ASME Section VIII, Div. 2, Class 1 vessels.
- New requirements allowing for R-Certificate Holders to maintain their R-form logs using only the National Board EDT system (section 5.6).
- Several revisions to Supplement 4 [S4.2 section title, b) and c); S4.3 h) and i); S4.5; S4.18.2.1 b) 2) d. 2. and 4.; S4.18.2.2 a) 2)]
- New section S4.19 for the Repair of High Pressure Filament Wound Vessels.
Part 4:
- New pressure relief device requirements for boilers up to 4,000 lb/hr (section 2.2.2).
- New overpressure protection requirements for Thermal Fluid Heaters (section 2.3).
- New rating requirements for discharge piping and fittings [paragraph 2.4.4.7 d), e), and f)].
- Section 3.2.6 has been restructured into a tabular format.
-New language in 4.6.2 requiring the manufacturer’s correction factor used in pressure testing be recorded on the valve repair document as described in paragraph 4.8.5.4 i).
- Language to Section 4.7.4 has been simplified for clarity.
- Section 4.7.5 has been deleted as it is a duplicate of section 4.7.4.
- With the addition of the “T/O” program in the 2019 NBIC, the old Supplement 3 has been deleted for the 2021 edition.
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