What to Consider When Selecting an AODD Pump for Hazardous Fluids

Related Vendors

DÜPERTHAL Sicherheitstechnik GmbH & Co. KG

Maag Pump Systems AG

Italvacuum, Srl

Wilden Pump & Engineering, LLC

Not all AODD technologies are created equal and Wilden, the respected leader in AODD pumps ever since Jim Wilden invented the technology in 1955, is the superior option for handling hazardous chemicals. Wilden AODD pumps offer a longer mean time between repair (MTBR), exceptional suction lift and self-priming capabilities (a critical aspect in transferring dangerous chemicals), and vast chemical compatibility, as well as the exclusive Pro-Flo X Air Distribution System (ADS) which lowers energy consumption.

One reason Wilden pumps are superior in dangerous chemical applications is the wide range of models available, as well as their respective materials of construction. Wilden offers the widest range of polypropylene (PP) and polyvinylidene fluoride (PVDF) pumps on the market. Wilden’s metal pumps, which include stainless steel and Hastelloy, feature Atex certification for use in hazardous areas.

Material Compatibility

Solvents can corrode parts made from aluminum or galvanized steel, and although solvent manufacturers typically add corrosion inhibitors, these do not work under all circumstances. Only stainless-steel or PVDF pumps should be used to pump solvents, and Wilden offers the widest range of PVDF and stainless-steel pumping options for these types of applications.

Wilden also features innovative diaphragms in various materials to meet any dangerous chemical pumping need. Diaphragm life varies depending on the abrasiveness of the fluid, temperature, size of the diaphragm, pumping media and lift conditions. Most dangerous chemicals cannot be handled with Neoprene or Buna-N and will instead require Wil-Flex, Viton, Nordel or PTFE (Teflon):

• Wil-Flex: made of Santoprene, this diaphragm is an excellent choice as a low-cost alternative to PTFE in many acidic and caustic applications, such as sodium hydroxide, sulfuric or hydrochloric acids. It exhibits excellent abrasion-resistance and durability at a cost comparable to Neoprene.

• EPDM/Nordel: excellent for use in applications requiring extremely cold temperatures. EPDM may also be used as a low-cost alternative for pumping dilute acids or caustics.

• Viton: excellent for use in high-temperature applications. Viton may also be used with aggressive fluids such as aromatic and chlorinated hydrocarbons and acids. PTFE would normally be used with these aggressive fluids as its flex life is better than Viton. However, in applications involving suction lift outside the range of PTFE, Viton is the preferred choice for highly aggressive fluids.

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