For boilers with fuel input greater than 12,500,000 Btu/hr, which standard do the controls and safety devices need to meet?

For boilers with a fuel input greater than 12,500,000 Btu/hr, the controls and safety devices must comply with NFPA 85. This National Fire Protection Association standard specifically addresses the requirements for the safety and operational controls of boilers and combustion systems with high-capacity outputs. It ensures that safety measures are rigorous and comprehensive due to the increased risks associated with larger boilers.

NFPA 85 provides guidelines for the design, installation, and maintenance of these systems to prevent accidents and enhance operational efficiency. The standard emphasizes various critical aspects, such as safety interlocks, emergency shutdown procedures, and detection systems, which are vital for protecting both personnel and property.

While ASME CSD-1, ANSI 135, and UL 726 may address other operational aspects or types of equipment, NFPA 85 is specifically tailored for high-capacity boilers, making it the applicable standard for this question.