Outline: ASTM A53 Steel Fire Protection Pipe Heading Subheading H1: Introduction to ASTM A53 Steel Fire Protection Pipe 　 H2: What is ASTM A53 Steel Pipe? Definition, Composition, and Types H2: Importance of Fire Protection Systems Why Fire Protection Sprinkler Pipes Matter H3: Fire Sprinkler System Overview How Sprinkler Systems Protect Buildings H2: ASTM A53