eccentric/concentric reducing couplings on hot water heating sys

edward j genario

is there any reason for eccentric reducing couplings being specified to be used on a closed loop hot water heating system?
i can understand if it was a steam system but its not.
any ideas?

Brad White_9

Typically on pumps

especially on the inlet (suction) side, flat-on-top eccentric reducers are used to pass air along to be vented at the volute or at least not hang up in the reducer "shoulder" before the pump suction.

Other than that and venting enhancement in general, I have no idea where else they might be used.

Big Ed

No Other....

.......then the installer needed a off set to keep the pipes straight or maybe it was his only reducing coulping he had left in his truck.. I know I'am always shy of them..

ScottMP

If its being

specified than some architect has old "boiler plate" spec's and thinks he is being through.

Maybe the building will be drained ??

Scott

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Weezbo

as an off-set around metal beams

or infront of end suction pumps like Brad says.... Steam would make far more sence ... for the most part it is an expensive way to make an offset.

EBEBRATT-Ed

I have seen this done on hot water in our area quite often. "flat on top" will get the air out easier.

ED

bob young

steam fitting

way too expensive a specialty fitting to be used when not needed. they are designed for steam work. period.