Occasionally I come across projects where the contractor (my client) is looking to use listed anchors or attachments that are listed, but have various strengths associated with them.
NFPA 13 lists the maximum spacing for hangers, but this maximum spacing doesn't always address these alternative hanging methods. NFPA 13 addresses these by requiring that any hanger assembly be able to support five times the weight of water filled pipe, plus 250 pounds.
Based on this, I've created a calculator that reverses this process and calculates the maximum spacing for hangers depending upon the pipe size, type, and strength of a hanging element. As this is the first week out I only have I-P units (sorry international friends, I'll continue to work on this), but let me know what you think in the comments section below.
Thanks and for those in the US have a great Thanksgiving week!
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Joe Meyer, PE, is a Fire Protection Engineer out of St. Louis, Missouri who writes & develops resources for Fire Protection Professionals. See bio here: About