AL Hydrofoil

• The most flow efficient impeller for low viscosity (up to 2500 cps) blending applications.
• Also used on solid suspension mixing problems where a relatively low percent solids will be encountered (free settling applications).
• This design is the narrowest blade hydrofoil and therefore is sometimes referred to as a "low solidity" hydrofoil.

• The AM Hydrofoil with its slightly wider blade than the AL design is useful on applications where viscosities of 2,000 to 5,000 cps are encountered or when a small amount of gas handling capability is required.
• Commonly applied to solid suspension applications which have a relatively high percent solids (35-55%) particularly when solid size is small which sets up an apparent viscosity in the slurry.
• This type of hydrofoil is sometimes referred to as a "mild solidity" design.

AM Hydrofoil

• The AH Hydrofoil is characterized by a very wide blade and can be used on applications with viscosities up to 75,000 cps.
• This design is the impeller of choice when coarse gas dispersion is required combined with high flow velocities for blending or solids suspension.
• This type of hydrofoil is sometimes referred to as a "high solidity" design.

HP Impeller

• The HP impeller is more flow efficient than a PBT and therefore imparts less shear into the fluid but more so when compared to hydrofoil designs.
• The HP power number lies between the PBT and the AL which is indicative of its flow and shear characteristics.
• This impeller is useful on taller tank applications because it can invest the same or greater torque into a fluid at lower speeds than an AL impeller, normally allowing longer shaft lengths.

PBT Impeller

• The Pitched Blade Turbine is more flow efficient than the radial style impellers and produces more fluid shear than the hydrofoil impellers.
• The impeller of choice when both flow velocity and fluid shear is required and/or when very high mixing intensity is required when the use of a hydrofoil would result in too high a tip speed or operating speed.
• Most common configuration is 4 blades pitched at 45° with the most common types being either 3 or 4 blades pitched at 32°.
• The 32° variety can handle slightly higher viscosity and is useful in low level mixing operations.
• This style of impeller is the least expensive axial flow impeller.

RBT Impeller

• The Radial Blade Turbine is ideal when very high torque is required for blending applications at the expense of flow efficiency.
• Other uses for this impeller include high shear applications other than gas dispersion (i.e., liquid-liquid emulsions, solids scrubbing or where low level mixing requirements need an impeller located close to the tank bottom).

RSB Impeller

• The curved blade or retreat curve turbine is the most flow efficient radial flow impeller.
• Used in flow sensitive (maximum pumping desired) applications when pumping in the radial direction is required.
• Typical applications include plug flow break-up, heat transfer, low level blending, and low level solid suspension.

RD Impeller

• This vertical flat blade, radial flow, disc-type turbine is available as both a 4 and 6 blade design, with the 6 blade version being the most common.
• This high shear device is normally employed on gas dispersion applications.
• The style is commonly referred to as the Rushton impeller.

RDC Impeller

• This impeller is similar to the Rushton turbine except curved blades are substituted for the vertical flat blades resulting in a lower power number.
• It is able to handle more gas before flooding and does not experience as great a power drop-off due to gas loading than the Rushton turbine.
• However, at elevated power levels it produces similar mass transfer as the Rushton design.