Metallic

Metallic pipe remains the predominant material for fire protection sprinkler systems due to its strength, durability, temperature resistance, and long-established performance in a wide range of occupancies. It is used to convey water (or other extinguishing agents) from the supply to discharge devices, forming the backbone of wet, dry, preaction, and deluge systems. Common metallic materials include carbon steel and, less frequently, stainless steel or copper, selected based on system type, environmental conditions, and corrosion considerations. Typical carbon steel sprinkler pipe is manufactured in accordance with ASTM standards such as ASTM A53 (standard weight and Schedule 40/80 pipe), ASTM A135 (electric-resistance welded steel pipe), and ASTM A795, which is specifically listed for fire protection service and commonly supplied in black or galvanized finishes. These standards define material composition, manufacturing processes, pressure ratings, and testing requirements to ensure reliability under fire conditions. Metallic pipe is generally used instead of non-metallic piping (such as CPVC or PEX) where higher pressures, larger diameters, or elevated temperatures are expected. It is also required in systems where listing limitations restrict non-metallic materials.