A centrifugal pump converts driver energy to kinetic energy in a liquid by accelerating the fluid to the outer rim of an impeller. The amount of energy given to the liquid corresponds to the velocity at the edge or vane tip of the impeller.
Similarly, What type of flow does a reciprocating pump have?
Explanation: The reciprocating pump has a continuous flow. It has a constant discharge even if head on the delivery side varies. Explanation: The reciprocating pump runs at a low speed. Its speed is less than 30m/min.
Additionally, What characteristics pump? The hydraulic properties of a pump can be described by some characteristics: o Q-H curve o Efficiency curve o Power curve o Net Positive Suction Head (NPSH) curve. Each of the characteristics is explained in the next sections for propeller pumps.
Which of the following is not considered a characteristic of a centrifugal pump?
Which among the following is not a characteristic curve for centrifugal pump? Explanation: The primary objective of a centrifugal pump is to transfer energy. Centrifugal pump is a turbomachinery. Transfer speed vs Transfer pressure is not considered as a correct characteristic curve.
What is function of centrifugal pump?
A centrifugal pump is a mechanical device designed to move a fluid by means of the transfer of rotational energy from one or more driven rotors, called impellers. … The action of the impeller increases the fluid’s velocity and pressure and also directs it towards the pump outlet.
Which type of pump requires air vessel?
Explanation: The air vessel, in a reciprocating pump, is a cast-iron closed chamber having an opening at its base. These are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
How does a reciprocating pump work?
The reciprocating pump works on the principle of positive displacement. A reciprocating piston pump consists of a piston that moves back and forth in a cylinder. The piston is connected with a crankshaft with the help of a connecting rod. This piston moves as the connecting rod move due to the motion of the crankshaft.
Which pump provides pulsating discharge flow?
In peristaltic pumps, pulsation is caused as fluid enters the head and becomes trapped between two rollers.
What is the characteristic curve of a pump?
The characteristic curve of a pump is the interaction of two variables that describe its performance: HEAD: the energy by unit of mass that the pump can supply to the fluid. FLOW RATE: the quantity of fluid that goes through a section in a certain period of time.
What is the function of the pump?
A pump produces liquid movement or flow: it does not generate pressure. It produces the flow necessary for the development of pressure which is a function of resistance to fluid flow in the system.
What is the use of pump?
Today, the pump is used for irrigation, water supply, gasoline supply, air conditioning systems, refrigeration (usually called a compressor), chemical movement, sewage movement, flood control, marine services, etc.
Which among the following is not a centrifugal pump?
4. Which among the following is not a centrifugal pump? Explanation: From the above, Energy pumps are not a type of centrifugal pump.
Which of the following is NOT selection criteria for pump?
Explanation: The weight is not the main selection criteria for selection of hydraulic pumps. There are different values for gear pumps, vane pumps and piston pumps for Pressure, Discharge and Speed which are predefined values.
What are pump performance characteristics?
Performance Characteristics of Pumps
The output of a pump running at a given speed is the flow rate delivered by it and the head developed. Thus, a plot of head and flow rate at a given speed forms the fundamental performance characteristic of a pump.
How does a centrifugal work?
A centrifuge is a device, generally driven by an electric motor, that puts an object, e.g., a rotor, in a rotational movement around a fixed axis. A centrifuge works by using the principle of sedimentation: Under the influence of gravitational force (g-force), substances separate according to their density.
What is function of water pump?
The water pump pushes coolant from the radiator through the coolant system, into the engine and back around to the radiator. The heat that the coolant picked up from the engine is transferred to the air at the radiator. Without the water pump, the coolant just sits in the system.
What is air vessel where it is used?
The air vessel is used as an accumulator to store compressed air, to separate condensate through cooling and to compensate for pressure fluctuations in a compressed air distribution system. In water supply systems, air vessels are used as hydrophors and also as safety components to avoid surge pressure.
What is air vessel in pump?
The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base. These are fitted to the suction pipe and delivery pipe close to the cylinder of the pump. The vessels are used for the following purposes: … (b) To save the power required to drive the pump.
Why are air vessels fitted?
These air vessels are installed near the suction & delivery valve to avoid separation. An air vessel is usually fitted in the discharge pipe to dampen out the pressure variations during discharge. As the discharge pressure rises, the air in the vessel gets compressed. Similarly, air expands when the pressure falls.
How does a single acting reciprocating pump work?
Single-acting reciprocating pump: This has one suction valve and one discharge valve. When the piston is moved backward, suction happens and when it moves forward, the delivery valve opens up to discharge the liquid.
How do you start a reciprocating pump?
Pump Start-up Procedure
- Line up the pump valves.
- Ensure that the drain valve is closed.
- Open the suction valve.
- Open the vent valve to bleed off gases – when liquid comes from the vent valve – close it again. …
- Open the gland-seal valve (if fitted).
- Commission the bearing and oil cooling systems (if fitted).
What is the difference between Centrifugal pump and reciprocating pump?
The main differences between Centrifugal Pump and Reciprocating Pump are the Centrifugal pump works low medium pressure head and Reciprocating Pump works high medium pressure head.
Which pump is used for high pressure and moderate discharge?
Centrifugal pumps are most efficient with low-viscosity liquids such as fruit juices and must, for which flow rates are high and pressure requirements are moderate. The discharge flow from a centrifugal pump is steady. These pumps are suitable for either clean/clear or dirty liquids.
What is positive displacement pump?
What is a positive displacement pump? A positive displacement pump transports fluids by trapping a fixed amount of the liquid and forcing it into the discharge pipe. The movement is started by two or three spindles that move in opposite directions of each other; pumping and thus displacing the liquid.
What is the difference between reciprocating pump and rotary pump?
Reciprocating pumps displace liquid by a backward and forward motion. This motion is in one direction, usually caused by a piston or diaphragm. On the other hand, rotary pumps use a part or parts to make a liquid rotate and displace it after one revolution.