The Straight Scoop on UPC/IAPMO Listed Grinder Pump Systems

At least two major sewage grinder pump manufacturers advertise their systems as having UPC/IAPMO listings. There has been some confusion as to what this listing really means.

Proper Feeding of a Submersible Pump

Submersible pumps are similar to children: They need to be properly fed. When a submersible pump is installed in a manner that does not permit free flow into the eye of the impeller, the pump may not perform as expected.

Easy and Trouble-Free Self-Priming Centrifugal Pump Adjustments

Most manufacturers employ semi-open impellers in their self priming centrifugal sewage and trash pump designs. While other types of impellers—enclosed, open or recessed—are sometimes used, this type of impeller has a proven field record for clog resistance and high efficiency. Unlike a totally enclosed impeller, the semi-open impeller lacks a front shroud. The impeller face operates in close proximity to an adjustable wear plate.

Oil‐Filled vs. Air‐Filled Premium Efficient Motors

If one debate over a specific design feature stands out amongst all the others in the submersible wastewater pump field, it must be, “Which is better: air‐filled or oil‐filled motors?” With the introduction of premium efficient motors by several manufacturers, this topic has come to the forefront once again. Each design has specific advantages. However, the advantages of an oil‐filled design outweigh those of an air‐filled design.

Premium Efficient Shaft Grounding Rings VFD Operation

When a motor is operated on a variable frequency drive, unexpected voltage can be induced on the rotor and shaft. A number of solutions have been employed in order to prevent early bearing failure in motors operated on drives.

Demystifying Explosion‐Proof Submersible Pumps

When a discussion turns to requirements for “explosion‐proof” pumps, many people rely on word of mouth, past practices or even old wives tales, it seems. The requirements for “explosion‐proof” pumps and systems are not really that difficult to understand, if you are willing to unlearn many of the myths most people take as truths.