What is the maximum pipe size that branchline hangers can be attached to metal roof decks according to NFPA 13?

Branchline hangers are crucial components in securing piping systems, and their installation must adhere to specific standards set forth by the NFPA 13. According to these standards, the maximum pipe size for branchline hangers that can be attached to metal roof decks is indeed limited to 1 inch in diameter.

This specification ensures that the hangers can adequately support the weight of the piping without compromising the structural integrity of the roof material. The limitations on pipe size are largely driven by considerations of load distribution, the attachment method to the roof deck, and the overall stability of the hanging system. Pipes larger than this size require different methods of support in order to ensure they can be securely fastened and maintained without risk of damage or failure.

The other options propose larger sizes, which would not meet the NFPA guidelines for this particular application. Therefore, understanding the maximum size for branchline hangers allows for safe and compliant installation practices within fire protection systems prescribed by NFPA 13.