How is Welded Pipe joined?

How is Welded Pipe joined?

• A. Threaded joints are used for all welded pipe.
• B. Adhesive bonding is allowed for welded pipe.
• C. Pipe joined by welding, permitted under NFPA 13.
• D. Soldered joints are required for compatibility.

Answer: (C)

Joining welded pipe means forming the connections by welding the pipe sections together. In NFPA 13 (and NFPA 13R for low-rise residential), welded pipe is joined by welding, which provides a continuous, leak-tight joint suitable for fire protection service. Threaded joints aren’t used on welded pipe, because the pipe is meant to be welded. Adhesive bonding and soldered joints aren’t standard or required methods for welded steel sprinkler piping in this code. So the correct concept is that welded pipe is joined by welding, as allowed by NFPA 13.

Joining welded pipe means forming the connections by welding the pipe sections together. In NFPA 13 (and NFPA 13R for low-rise residential), welded pipe is joined by welding, which provides a continuous, leak-tight joint suitable for fire protection service. Threaded joints aren’t used on welded pipe, because the pipe is meant to be welded. Adhesive bonding and soldered joints aren’t standard or required methods for welded steel sprinkler piping in this code. So the correct concept is that welded pipe is joined by welding, as allowed by NFPA 13.