In which scenario does the code permit waiver of special inspections?

The correct choice pertains to the scenario involving an approved fabricator. The purpose of special inspections in structural steel and bolting is to ensure that construction adheres to the specified design and code requirements. When an approved fabricator is involved, they typically have a proven track record of compliance with relevant codes and standards. This relationship can allow for a waiver of special inspections, reflecting the confidence in their quality control measures.

Approved fabricators often undergo rigorous evaluation and must demonstrate their ability to produce structural steel components that meet stringent quality requirements. As a result, the code may recognize this assurance of quality and allow for the waiver of certain additional inspections, streamlining the process while maintaining safety and compliance.

In contrast, the other scenarios provided do not align with regulatory standards. Project delays, inspector unavailability, or the cost of inspections do not typically warrant waivers, as they do not justify the diminishing of quality assurance protocols that are crucial for the safety and integrity of structural components. The integrity of structural systems is paramount, and regulations are designed to uphold rigorous inspection processes to prevent failure.