Are class 150 lb cast iron fittings allowed in a Halon 1301 system?

In a Halon 1301 system, class 150 lb cast iron fittings are not permitted due to the specific materials and design constraints required for fire suppression systems. Halon systems are designed to operate under specific pressure and temperature conditions, and the materials used in their construction must be compatible with these operational requirements.

Using cast iron fittings might introduce the risk of structural integrity issues, especially under high-pressure conditions, since cast iron can be brittle and prone to cracking or failure. Typically, materials that are compliant with NFPA (National Fire Protection Association) standards and possess higher safety ratings are mandated for use in these types of fire suppression systems. Hence, the answer reflects adherence to safety standards necessary for effective and reliable operation of Halon systems.