What does the visual examination during inspection verify according to NFPA 54?

The visual examination during inspection primarily verifies compliance with the manufacturing and installation standards outlined in NFPA 54. This code establishes requirements for safe installation and operation of gas piping systems. By performing a visual inspection, an inspector can assess whether the installation adheres to these standards. This includes checking for proper installation techniques, correct materials used, and that all components are installed in a manner that meets safety and performance guidelines.

While aspects like aesthetic standards, presence of protective coatings, and correct labeling of components are important for overall system integrity, the main focus of a visual examination is to ensure that the system complies with the essential operational and safety standards set by the NFPA to prevent hazards such as leaks or malfunctions. Thus, compliance with the code's manufacturing and installation standards is the most critical aspect the inspection seeks to verify.