What is the best pump for marina pumpouts?

Diaphragm Pumps vs. Peristaltic Pumps

Pump out stations can be an effective way to manage sewage wastes and recycled contaminated water. In the past, marina pumpout stations used diaphragm pumps then moved into peristaltic pumps.

Diaphragm Pumps

A diaphragm pump is a type of machine that uses either a ball valve or a flapper valve to transfer liquids. This pumping method collects contaminated water on a random pulse flow. According to General Pumps and Machinery, inventor Jim Wilden developed the diaphragm pump in 1955 as an air-operated double machine technology.

Diaphragm pumps are known for employing a large amount of suction tubes, injection fitting with check valve, and discharge tubing. However, Blue-White Industries Ltd. said that this energy efficient pump operates with a bad shear stress and will damage fluids. The diaphragm pumps can have difficulty priming via poor outgassing while using a large discharge range of more than 125 psi. Diaphragm pumps can have issues with clogged valves when dealing with non-dissolved solids, which may lead to pumping failure. These kinds of pumps have several advantages including working with a good remote adjustment, dealing with large temperature changes, excel at pumping clean chemicals into higher pressure systems and can operate with a random injection at low motor speed.

Peristaltic Pumps

“Peristalsis” is defined in the dictionary as “waves of contraction passing along the walls of a hollow muscular organ (intestine) and forcing the contents onward.” Peristaltic pumps are automatic priming pumps. Peristaltic pumps are designed for liquid and non-liquid use. Peristaltic pumps do not clog. The peristaltic pumps are a circular size format and excel at pumping dirty fluids into lower pressure systems. This one of a kind pump can operate with a continuous injection at low motor speed. The peristaltic pump is considered one of the fastest pumping machines available in the marine industry.

Peristaltic pumps are the superior pumps specifically for marina pumpouts because of good outgassing, great shear stress and the ability to collect non-dissolved solids.