How do I determine the “Hand” of a Series 4600 HSC pump?
The blades of a centrifugal pump impeller, whether single suction or double suction, must rotate in the proper direction, in order to throw the liquid into the casing volute in the designed manner. The curved impeller blade must not “cup” the pumped liquid, so the rotation must not drive the concave, or “cupped” impeller blade surfaces forward. Instead, the liquid must enter the impeller eye(s) and be thrown from the convex surface, or “belly”, of the blades into the casing volute. To accomplish this, the impeller must rotate in the proper direction, with the belly of each impeller blade facing the direction of rotation. Single Suction pump impellers, with a little care taken, are usually installed on the pump shaft correctly. The impeller eye, with the blade roots evident, will face the pump suction connection and, when the pump rotation matches the directional arrow on the pump casing, the impeller will pump the liquid as designed. Note that all Armstrong single suction commercial pu
