A 14 NPS nozzle is to be added to a vessel shell that is rated for 100 psig at 650°F. What is true about this work?

A 14 NPS nozzle is to be added to a vessel shell that is rated for 100 psig at 650°F. What is true about this work?

• A. This work is considered an alteration
• B. This work is considered a repair
• C. The shell-to-nozzle weld must be radiographed
• D. This work must be authorized only by the API 510 Inspector

Answer: (A)

The addition of a 14 NPS nozzle to a pressure vessel shell is classified as an alteration because it involves modifying the original design of the vessel. According to the code definitions, an alteration refers to any changes that affect the pressure-retaining capability of the vessel or its design. Adding a nozzle changes the configuration of the pressure vessel and can impact its structural integrity, operational performance, and safety, thus necessitating careful consideration and assessment. In this context, even though repairs may involve welding or other modifications, they are typically aimed at restoring a vessel to its original condition rather than changing its design or capacity. The work required for this nozzle addition demands different considerations, including potential re-evaluation of the safety and integrity of the entire system. Overall, labeling this work as an alteration ensures adherence to the regulations and safety standards that govern pressure vessel design, operation, and modifications. When alterations are made, additional evaluations and inspections may also be required to ensure continued compliance with safety codes.

The addition of a 14 NPS nozzle to a pressure vessel shell is classified as an alteration because it involves modifying the original design of the vessel. According to the code definitions, an alteration refers to any changes that affect the pressure-retaining capability of the vessel or its design. Adding a nozzle changes the configuration of the pressure vessel and can impact its structural integrity, operational performance, and safety, thus necessitating careful consideration and assessment.

In this context, even though repairs may involve welding or other modifications, they are typically aimed at restoring a vessel to its original condition rather than changing its design or capacity. The work required for this nozzle addition demands different considerations, including potential re-evaluation of the safety and integrity of the entire system.

Overall, labeling this work as an alteration ensures adherence to the regulations and safety standards that govern pressure vessel design, operation, and modifications. When alterations are made, additional evaluations and inspections may also be required to ensure continued compliance with safety codes.