Back to Basics: Sprinkler Piping Materials |
NFPA 13 lists three standards for steel pipe: ASTM A53, ASTM A135 and ASTM A795. ASTM A53 is the standard that regulates standard weight, extra strong and double extra strong steel pipe for general use. Standard weight pipe is also called Schedule 40 steel pipe. Similarly, extra strong is called Schedule 80 and double extra …