Why is a reciprocating pump not coupled directly to the motor discuss the reason in detail?

So the motor can continue to rotate while the cylinder stops. Also in case of closing the outlet valve of a pump, the pressure in the cylinder can fail the cylinder or crankshaft and accessories. in this case the clutch can separate the power from motor to the pump and prevent failure of pump.

What happens when two pumps are in series?

The term Pumping in Series means that 1 pump acts as a booster to feed another pump. So, each of these 2 Pumps in Series is lower cost, lower power, and potentially more reliable as a system than a single larger pump that produces the same heads as the total of the two smaller Series pumps.

What is the disadvantage of reciprocating pump?

Disadvantages of Reciprocating Pump: 1) The pump is very costly (Capital cost is high). 2) Viscous liquids are difficult to pump using a reciprocating pump. 3) The maintenance cost of the pump is very high as there is a large number of parts. 4) The flow rate is less.

Where centrifugal pump and reciprocating pump is used?

It is mostly used for domestic purpose and where higher discharge at low head required. These are mostly used in industries and high viscous fluid pumped at a high head. Today we have learnt about difference between centrifugal pump and reciprocating pump.

What are the advantages and disadvantages of a reciprocating pump?

Advantages and Disadvantages of Reciprocating Pump

• This pump is self-priming – Not require filling the cylinders by starting.
• This pump can work in wide pressure range.
• Priming is not necessary in pump.
• Provide high pressure at outlet.
• Provide elevated suction lift.
• They are use for air also.

Can you run centrifugal pumps in series?

Putting your centrifugal pumps in series, or connected along a single line, will let you add the head from each together and meet your high head, low flow system requirements. This is because the fluid pressure increases as the continuous flow passes through each pump, much like how a multi-stage pump works.

When pumps are used in series?

Pumps in Serial – Head Added When two (or more) pumps are arranged in serial their resulting pump performance curve is obtained by adding their heads at the same flow rate as indicated in the figure below. Centrifugal pumps in series are used to overcome larger system head loss than one pump can handle alone.

What is the advantage of centrifugal pump over reciprocating pump?

Floor Space and Capacity Centrifugal pumps require less floor space than reciprocating pumps of equal capacity because of the simpler design. Also, the capacity of the centrifugal pump can be increased more easily by enlarging the inlet and outlet diameters and increasing the impeller speed.

What is the disadvantage of centrifugal pump compared with reciprocating pump?

Efficiency of these pumps are low compare to reciprocating pump. Efficiency is high. 7. Centrifugal pump have problem of priming.

What is reciprocating pump and how does it work?

Reciprocating pumps are more suitable for low volumes of flow at high pressures. It is used to suck the water from the water reservoir to the cylinder. It connects the inlet of the pump with the water tank. The suction valve is a non-return valve which means the only one-directional flow is possible in this type of valve.

Can you start a reciprocating pump with the discharge block valve closed?

Thus no reciprocating pump should ever be started or operated with the discharge block valve closed. Flow is regulated by speed. In rare cases that require a discharge throttle valve, an automatic bypass valve that is piped back to the suction source must be provided.

What is the maximum speed of a reciprocating pump?

Small pumps for clean liquids can operate at speeds up to 1500rpm which require valves to operate successfully at frequencies up to 25Hz. Reciprocating pumps are used for a wide variety of applications not just high pressure.

Why does my a reciprocating pump pulsate so much?

A reciprocating pump produces pulsation at multiples of the pump speed, and the magnified pulsation in the system is generally worse at multiples of the plunger frequency. Most systems have more than one natural frequency, so problems can occur at differing pump speeds.