What are the classification of pumps? (R)

CLASSIFICATION OF PUMPS

Introduction

In many different sectors, liquids are transferred and distributed using pumps. Hydraulic energy is transformed into mechanical energy by pumps. The majority of the time, electrical energy is used to power different kinds of pumps.

Pumps have two main purposes.

1. Liquid being moved from one location to another (for example, water being moved from a subterranean source into a water storage tank).

2. Move liquid through a system (such as lubricants through machinery and equipment or cooling water).

Pump casing and impellers, prime movers such as electric motors, diesel engines, or air systems, piping used to transport the fluid, valves used to control the flow of the system, and other fittings, controls, and instrumentation are all parts of a pumping system.

The components and configuration of the pumping system are determined by the end-use equipment, which has various requirements (for example, pressure and flow). Heat exchangers, tanks, and hydraulic machinery are a few examples.

Classification

There are many different types of pumps available, each one created for a different application. However, the majority of them can be roughly divided into the two groups listed below.

 i. positive displacement

 ii. dynamic pressure pumps

Positive Displacement Pumps

Due to the fact that positive displacement pumps are created to move a more or less constant volume of fluid during each cycle of operation, the term "positive displacement pump" is highly descriptive. The displacement per cycle of the moving member (which may rotate or reciprocate) multiplied by the cycle rate (for example, rpm) yields the volumetric flow rate. Therefore, the pump's design, size, and speed of operation determine its flow capacity. 

The pump's ability to produce pressure (or head) is only constrained by the size of the driving motor and the robustness of the components and is dependent on the flow resistance of the system in which it is installed.

In order to prevent damage to the pump, the discharge line from the pump should never be shut off completely without allowing for recycling around the pump. They can also be divided into:

Types of Positive Displacement Pumps

Reciprocating pumps

By moving the piston or diaphragm in the cylinder back and forth, pumping is accomplished. It is frequently employed when handling a small amount of liquid and when the delivery pressure is rather high.

Piston pump: A form of positive displacement pump called a piston pump has a high-pressure seal that reciprocates along with the piston. A piston-cylinder system is used in the pump. Following the delivery stroke, the piston leaves the cylinder, creating low pressure that causes the suction valve to open. The fluid-filled cylinder is compressed during the forward stroke, which opens the delivery valve and allows liquid to be delivered.

Diaphragm pump: employs a proper non-return check valve along with a diaphragm made of rubber, thermoplastic, or Teflon to pump a fluid. This kind of pump is occasionally referred to as a membrane pump.