Which term refers to any change that requires a change of design calculations in pressure equipment?

• A. Modification
• B. Alteration
• C. Inspection
• D. Repair

Answer: (B)

The term that refers to any change that necessitates a modification of design calculations in pressure equipment is alteration. An alteration involves any significant change to the system that may affect its pressure-retaining ability, safety mechanisms, or operational parameters, thereby requiring a reassessment of its design calculations.

In this context, alterations are typically more substantial than simple modifications or repairs. They often involve changes in design, construction materials, or system configuration. Since alterations impact the foundational aspects of the equipment's integrity and performance, updated calculations and evaluations are essential to ensure continued compliance with safety standards and regulatory requirements.

Modifications, while they can involve changes to existing equipment, typically refer to enhancements or adjustments that do not necessarily require a complete reassessment of design calculations. Inspections are focused on evaluating the equipment's current condition without altering any design, and repairs relate to fixing issues or damage without altering the design parameters significantly. Therefore, alteration is the most accurate term for changes that demand a reevaluation of design calculations in pressure equipment.