RETURN BENDS FOR SPRINKLERS 1

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Return Bends on pendant type wet sprinklers when the network is supplied by raw water sources. Return bends are also not necessary on wet systems that use a potable water supply.
There is insistence about their use for the reason that, black steel pipes would eventually corrode on the inside and could then possibly interfere with proper sprinkler operation. Does this extra contingency measure justify the cost of providing the return bends, given that the space above the false ceiling is already constricted? Are return bends definitely optional or are there areas where these are mandatory? THANKS.

 

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The purpose of a return bend, also known as gooseneck, is to prevent the accumulation of sediment, mineral deposits, and pipe scale in the pipe drop to a fire sprinkler. If these materials collect, the drop pipe or sprinkler orifice could be obstructed and impaired.

Since the objective of a return bend to avoid accumulation of sediment in the drop nipples, the return bend is required to be connected to the top of branch lines.

With return bends, you may flush out the debris from the piping.