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Flanges for Circulating Pumps
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Flanges allow for more connection type and pipe size options when mounting a flanged circulating pump inline between two sections of pipe. Since a pump can work with a range of pipe sizes, the flange can act as an adapter between the pumps intake and discharge connections. Flanges are bolted to the pump and attached to the pipe with either sweat (SWT) or threaded (FNPT) connections. They must match the material of the pump and the system in which it is used, hydronic or potable. Hydronic pumps are made of cast iron. Potable pumps are made of stainless steel or bronze to prevent corrosion in systems that deliver drinkable water.