NFPA 13 requires clamps to support the weight of a standpipe at every ______.

NFPA 13 requires clamps to support the weight of a standpipe at every ______.

• A. Level
• B. Every floor
• C. Base
• D. Every other level

Answer: (D)

NFPA 13 sets how a vertical standpipe must be supported so the pipe can carry its own weight without sagging or misalignment. The standpipe runs through multiple levels, and the portion between supports behaves like a cantilever arm that would deform if left unbraced. Installing clamps at alternate levels provides enough restraint to keep the pipe straight and aligned while allowing for some movement from temperature changes and building movement. This spacing also avoids unnecessary hardware while still meeting structural and functional requirements. The base alone wouldn’t stop the upper sections from sagging, and placing supports on every floor is more than what the standard requires.

NFPA 13 sets how a vertical standpipe must be supported so the pipe can carry its own weight without sagging or misalignment. The standpipe runs through multiple levels, and the portion between supports behaves like a cantilever arm that would deform if left unbraced. Installing clamps at alternate levels provides enough restraint to keep the pipe straight and aligned while allowing for some movement from temperature changes and building movement. This spacing also avoids unnecessary hardware while still meeting structural and functional requirements. The base alone wouldn’t stop the upper sections from sagging, and placing supports on every floor is more than what the standard requires.