Which listing accompanies NFPA 58 for the propane pump bypass valve differential pressure setting?

• A. UL listing
• B. FM Global
• C. CSA
• D. Intertek listing

Answer: (A)

The safety check here centers on using a properly certified component in LPG systems. NFPA 58 requires that the propane pump bypass valve, and specifically its differential pressure setting, be a listed device so it has been tested and proven safe for propane service. UL listings are the standard certification used for propane equipment in this context, confirming the valve is designed, built, and tested to handle the pressures and conditions of LPG systems. This third‑party verification gives inspectors and installers confidence that the valve will operate correctly and not create unsafe conditions.

Other labs certify equipment as well, but NFPA 58 most commonly references UL listing for this particular application, which is why that option is the best choice.