The best solution is to use an eccentric reducer orientated to eliminate the possibility of air pockets. A reducer fitting is typically used in pump suction piping to reduce the size of the suction pipe to match the size of the pump suction end flange. A reducer is a constriction and requires careful design to avoid both turbulence and the creation of pockets where air or vapour might collect. It’s standard practice to employ suction-side piping one or two sizes bigger than the pump inlet. Occasional damage on the discharge side due to liquid separation.Insufficient fluid pressure leading to cavitation.Noisy operation, turbulence and friction losses.If the design fails to produce a uniform velocity distribution profile at the pump inlet many pump problems and failures can be traced. The design of pump suction / inlet piping defines the resulting hydraulic conditions experienced at the pump inlet / impeller.
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December 2022
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