Bell and Gossett Suction Diffusers

steve curran

I Need To Know The Purpose Of A Bell And Gossett Suction Diffusers On Hot Water Heating Circulating Pumps.

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Try this

link, if it doesn't load, B&G has a great website. www.bellgossett.com

http://fhaspapp.ittind.com/literature/files/56.pdft rod

hot rod

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Paul_6

If you look at

the installation instructions for a B&g base mounted pump they recomend a minimum of ten pipe diameters of straight pipe going into the suction inlet. this is to prevent cavitation at the inlet. if you are working with a pump with a 3 or 4" inlet the pipe would be quite long. if you just drop down and elbow in, air will have your impeller for lunch. a suction difuser has vanes in it to straighten the flow of water in a very compact space. it also has a strainer basket with a fine mesh "start up screen" in it. this screen is meant to be removed after the first few hours of operation. better difusers will have a threaded plug in them at the bottom, and the plug will have a magnet built in to collect chips etc. I usually install a tee at the bottom, put the plug back in, and install a ball valve with a hose bibb on the run. if you don't use the suction difuser you have to have a long piece of inlet pipe and a wye straioner on the inlet side. very rarely is there room for this arraingment. hope this helps. Paul

tom mahon

it

controls turbulance and flow into the suction side of the pump. It allows a pipe drop directly into the suction side of the pump. One benifit is space savings another is cavitation prevention...