Components of a Return Bend
A return bend is the piping arrangement for pendent sprinklers where piping stems from the top of the branch pipe (riser nipple), runs horizontally (arm over), and then down to the sprinkler (drop).
Raw Water Sources, Mill Ponds, Open-Top Reservoirs
Where Not Required
So Why Use Return Bends?
1. Sediment Accumulation
Things to Consider
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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