Excellence Industrial Pumps excel in diverse applications

Excellence slurry  pumps are extremely robust pumps, ideal for heavy duty operations on intermittent or continuous duty cycles.  They are a simple to use, easy to control, versatile and reliable way to pump liquids. Excellence Industrial slurry pumps can be used in a broad range of applications:

The transfer of lime milk or activated carbon is an essential step in the treatment of wastewater and potable water. Excellence  pumps are designed to provide the highest performance whilst having the smallest footprint. Maximum efficiency, reliability and reduced maintenance costs are ensured when using Excellence pumps. 

An imbalance of low and high pressures can occur as a result of injecting the fluid for a chamber filter press system. With their extended range of accessories, Excellence pumps ensure a trouble-free, controlled operation.

About Rotodynamic (Centrifugal) Pumps  

Rotodynamic pumps may be classified by such methods as impeller or casing configuration, end application of the pump, specific speed, or mechanical configuration. The method used in Figure 1.1.3a is based primarily on mechanical configuration.

 

1.1.1 Scope 

This standard covers rotodynamic pumps with centrifugal (radial), mixed flow, and axial flow impellers, as well as regenerative turbine and pitot tube type pumps, of all industrial/commercial types except vertically suspended diffuser turbine pumps. It contains description of types, nomenclature, and definitions. 

1.1.2 Definition of rotodynamic (centrifugal) pumps

Rotodynamic pumps are kinetic machines in which energy is continuously imparted to the pumped fluid by means of a rotating impeller, propeller, or rotor. The most common types of rotodynamic pumps are centrifugal (radial), mixed flow, and axial flow pumps. 

Centrifugal pumps use bladed impellers with essentially radial outlet to transfer rotational mechanical energy to the fluid primarily by increasing the fluid kinetic energy (angular momentum) and also increasing potential energy (static pressure). Kinetic energy is then converted into usable pressure energy in the discharge collector. 

1.1.3 Types of rotodynamic pumps

Rotodynamic pumps are most commonly typed by their general mechanical configuration (see Figures 1.1.3a, b, c, and d). The broadest characteristics, which include virtually all centrifugal pumps, are discussed in the following paragraphs:

 

1.1.3.1 Overhung impeller type

In this group, the impeller(s) is mounted on the end of a shaft that is cantilevered or “overhung” from its bearing supports.

These pumps are either close coupled, where the impeller is mounted directly on the driver shaft; or separately coupled, where the impeller is mounted on a separate pump shaft supported by its own bearings. One variation of this design is the submersible type, where a close-coupled pump/electric motor unit is designed to operate while submerged in the liquid it is pumping or another liquid.

 

1.1.3.1.1 Close coupled

Close-coupled pumps are commonly characterized by the following attributes: 

The pump and driver share one common shaft; the driver bearings absorb all pump thrust loads (axial and radial).

The driver is aligned and assembled directly to the pump unit with machined fits. 

1.1.3.1.2 Short coupled

Pumps described as short coupled have a coupling arrangement in which the motor is supplied with a flange adaptor that mounts directly to the casing, or body of the pump, thereby permitting the use of a single or solidly coupled shaft. A variation of this design is a magnetically coupled sealless pump, which uses a series of magnets mounted directly on the motor shaft. (See also Section 1.1.6.8 Special case ASME/ANSI B73.1, C-frame adaptor.) 

Short coupled pumps are commonly characterized by the following attributes:

The pump and driver have separate shafts; the pump has an integral bearing housing to absorb all pump thrust loads (axial and radial). The driver is aligned and assembled directly to the pump unit with machined fits.

 

1.1.3.1.3 Rigidly coupled

Pumps described as rigidly coupled have their shaft rigidly coupled to the driver shaft. 

Rigidly coupled pumps are commonly characterized by the following attributes: 

The pump and driver have separate shafts connected by a rigid coupling; the pump has an internal product-lubricated radial bearing. The driver is aligned and assembled directly to the pump unit with machined fits. The driver bearings absorb all pump axial thrust loads and residual radial loads.

 

1.1.3.1.4 Flexibly coupled

Pumps described as flexibly coupled have the pump shaft flexibly coupled to the driver shaft via a flexible element drive coupling. Usually of the spacer type.

Flexibly coupled pumps are commonly characterized by the following attributes:

Pump and driver have separate shafts; the pump has an integral bearing housing to absorb all pump thrust loads (axial and radial). With this arrangement the motor may be mounted on a support that is independent of the pump and not structurally connected to the pump frame. 

1.1.3.1.5 High-speed integral gear-driven pumps

High-speed integral gear-driven single-stage overhung pumps have a speed increasing gearbox integral with the pump. The impeller is mounted directly to the gearbox output shaft. There is no coupling between the gearbox and pump; however, the gearbox is flexibly coupled to its driver. These pumps may be oriented vertically or horizontally. 

Integral gear-driven single-stage overhung pumps are commonly characterized by the following attributes:

Pump, gearbox, and driver have separate shafts; the pump and gearbox have internal bearings to absorb all thrust loads (axial and radial). The gearbox shaft is flexibly coupled to the driver shaft and the motor mounts on a frame supported by the pump and gear unit.

 

1.1.3.2 Impeller between-bearings type 

In this group, the impeller(s) is mounted on a shaft with bearings at both ends. The impeller(s) is mounted between these bearings.

 These pumps may be further identified as single-stage or multistage configurations.  asa0422