Transferring fluids is by far the most common application for an Air-Operated Double Diaphragm pump, and can be found in numerous industries such as paint and varnish, chemical, construction, water treatment, oil, marine, mining and many more. The need to transfer fluids is a vital part of day to day operation in most industrial plants.
There is a true science to designing a pump that can handle various types of fluid while applying an appropriate flow rate to get the job done accurately and on schedule. All-Flo diaphragm pumps are able to move almost any fluid, from the thinnest solvents to harsher elements such as slug and sand, with no damage to the fluid or the pump itself.
While fluid transfer is simplest of pumps applications, often involving moving fluid from one tank to another, some basic considerations must be made. The most important consideration is material compatibility with the process chemical/fluid. Aluminum and Buna-N will suffice for milder fluids, but plastic pumps, such as Polypropylene of PVDF need to be used for harsher chemicals. A chemical compatibility guide can assist with selecting the write material for your application (Diaphragm Pump Material Guide).
Some other considerations should be made, such as considerations for Net Positive Suction Head (NPSH). In practice, no more than 10PSIG of positive suction pressure should be applied to any air diaphragm pump. Practically speaking, when pumping water (specific gravity of 1.0), this can mean the suction tank should not be taller than 23ft above the pump. For materials with a higher specific gravity, for example 60% Sulfuric Acid (specific gravity of 1.5) the tank should not exceed 15.3 ft in height (23ft/1.5).
All-Flo will gladly answer all your technical questions and help determine the best air operated double diaphragm pump for your next fluid transfer application. Our basic checklist involves investigating the fluid being moved, the size of the holding tanks involved, the flow rate needed and the desired unloading time. From there, we decide which of our pumps is best suited for the job.