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Glossary


A

The combination of solid parts having a certain volume in multiple parts of greater size.

Motion of a liquid inside a basin, a tank or a reactor usually triggered by an agitator. The stirring is used for multiple purposes, here are some examples: homogenizing two or more liquids, dissolving solid substances in liquid substances, keeping in suspension solid substances present in liquid substances, lowering the temperature.

Machine used for the transmission of energy to a liquid in order to trigger and maintain a motion.

Movement of a fluid which moves from the bottom to the top of a tank.

Movement of a fluid which moves from the top to the bottom of a tank.

B

Obstacle to be applied to the walls of a cylindrical tank. The purpose of baffles is to stop the circular rotary motion triggered by the agitator and facilitate axial flow. They are mandatory if the agitator is installed in the center of the tank; 3 must be applied when impellers with 3 blades are used or 4 for turbines.

Tank inside which the product to be stirred is stored. Generally parallelepiped-shaped they can be of multiple materials: plastic material, iron, concrete.

External part of the impeller that is fixed or welded to the hub.

Time required to achieve a homogenization of different substances deemed adequate within a tank.

Mixing of different substances.

Stabilizer installed in the bottom of the tank to avoid oscillations of the agitator shaft and lighten the loads on the reducer bearings. It is generally applied when the shaft is very long and / or the agitator works even in the absence (or partial presence) of the liquid. The installation of the bottom bushing can only be omitted if envisaged in the machine design phase.

C

These accurate data from the LDV are combined with the power of “Computational-Fluid-Dynamics”. Programs (CFD) in order to predict the mixing dynamics in large tanks with unusual geometry or specific process requirements. This powerful capability reduces substantially pilot- or full scale trials.

Speed at which the flexion transmitted to the shaft is the maximum tolerable by the structure and the material, sometimes causing the break.

D

Ratio between mass and volume of a liquid substance.

The breakdown of the solid parts having a certain volume into multiple parts of smaller size.

E

Temporarily stable mixture of two immiscible fluids, one of which is dispersed in the other in the form of droplets. To keep the emulsion stable it is necessary to stir the fluids.

Engineering, Procurement, Construction.

F

The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal.

Constant thanks to which it is possible to calculate the pumping volume of an impeller. It is closely related to the impeller design.

Organic fraction of urban waste.

G

Velocity gradient, it is an indication of agitation level.

The speed reducer is a mechanical device designed to reduce rotation speed from the input shaft (motor shaft) to the output shaft (agitator shaft).

Glass-Fiber Reinforced Plastic, Glass-Reinforced Plastic.

H

Internal part of the impeller that is fixed or welded to the agitator shaft.

I

Part of the agitator that transmits the force to the fluid to be stirred. Composed of 2 or more blades of different shape and type, each impeller has different hydraulic characteristics according to the shape of the blades. The impeller diameter starts from 200 mm and goes up to a few meters depending on the basin and the process.

M

Impeller made up of 3 petal shaped blades. Generally used in fast agitators (900-1400 rpm). The diameter of the PRO-DO-MIX marine propeller is maximum 160 mm.

Mechanical component that transforms the energy source into continuous mechanical work. It can be powered by electricity (electromechanical motor) or by compressed air (pneumatic motor). Typically, it is used electromechanical motor with of 4-pole (1450 rpm), but different intallations require the application of faster engines (the same pneumatic motor rotates at 2800 rpm) or more lenses (6 poles, 900 rpm ). To further reduce the number of engine revolutions, we opt for the use of speed reducers.

O

Original Equipment Manufacturer.

P

Constant thanks to which it is possible to calculate the power absorbed by an impeller. It is closely related to the impeller design.

Parts Per Million.

R

Tank inside which various elements are emulsified which will generate the blend. Unlike a simple tank, it is common to use steel reactors; reactions can generate gases that increase the pressure inside the tank.

Adimensional group used in fluid-dynamics, proportional to the ratio between the inertia forces and the viscous forces.

S

Motion transmission member from the motor (or from the reducer if present) to the impeller.

Sludge Velocity Index.

T

Container inside which the product to be stirred is stored. Generally cylindrical (but also cubic in shape known as IBC) they can be of multiple materials: plastic material, fiberglass, iron.

Total Dissolved Solids.

Total Suspended Solids.

Impeller consisting of 2 or 4 linear blades, its characteristic is to create a strong turbulence and to have a great cutting capacity. The diameter of the turbine starts from 200 mm and reaches up to 2000 mm.

V

Physical quantity that measures the resistance of a fluid to flow. The unit of measurement generally used is cP (centipoise).

Variable-speed Drive, Adjustable Speed Drive