Does NFPA 13 require pipe hangers and supports that are not UL/FM listed to account for pressure thrust forces and any other forces beyond NFPA 13-2019 17.1.2 for five times the weight of the water-filled pipe plus 250 lb at each point of piping support?
We have a 6" dry standpipe (NFPA 14 references NFPA 13 for hangers and supports) and we calculated a downward force of around 2,000 lbs to satisfy NFPA 13-2019 17.1.2. However, taking thrust into account at a specific location with a 90-degree elbow, the calculated thrust force is around 6,000 lbs. This appears very high and wondered whether any other fire protection professionals can weigh in on whether thrust force should be accounted for. I do not see any NFPA 13 requirements to satisfy thrust forces for aboveground piping.
We have a 6" dry standpipe (NFPA 14 references NFPA 13 for hangers and supports) and we calculated a downward force of around 2,000 lbs to satisfy NFPA 13-2019 17.1.2. However, taking thrust into account at a specific location with a 90-degree elbow, the calculated thrust force is around 6,000 lbs. This appears very high and wondered whether any other fire protection professionals can weigh in on whether thrust force should be accounted for. I do not see any NFPA 13 requirements to satisfy thrust forces for aboveground piping.
