Deep Well Jet Pump Diagram: How It Works


This article discusses about deep well jet pump diagram. The reader need not have a pre requisite about jet pumps. In this article we shall study about jet pumps as well as deep well jet pump.

The word jet refers to a stream of fluid moving with high velocity and pressure. In this article we shall study about working of a jet pump, deep well jet pump diagram, applications of jet pump and different types of jet pumps available in the industry.

What is jet pump?

A jet pump is simply an assembly of a centrifugal pump, nozzle and a venturi. The jet pump gives out water at high velocity and pressure.

Venturi is used for creating a pressure difference due to which suction increases. We use nozzle to increase the pressure of fluid. In further sections we shall discuss about different types of jet pumps and working of jet pumps in detail.

What is a deep well jet pump?

A deep well jet pump is simply a jet pump that is used to draw waters having depth ranging from 25 ft- 110 ft. This is deeper than usual situations hence the name deep well jet pump.

The working of the deep well jet pump is same as a normal jet pump with the only difference being the diameter of impeller casing, greater the diameter greater the suction and hence greater the depths the jet pump can work on.

Deep well jet pump diagram

A deep water jet pump is used in deep wells. The diagram of deep well jet pump is given in the section below-

Image Credits: Diy.Stackexchange.com

How does a deep well jet pump work?

The working of a deep well jet pump is similar to a normal jet pump. In the section below we shall study about the working of a deep well jet pump.

In a deep well pump, the pipe which is connected to the impeller casing draws water inside the jet’s body that is located around 10-20 ft deep below the minimum well water level. A second pipe connects to the output of the pump. The centrifugal pump is an assembly of electric motor and impeller, when the motor starts moving the impeller connected to it also starts moving, creating a suction. Later when the fluid passes through venturi more pressure difference is created and the velocity of the fluid is increased.

Types of jet pump

There are two main types of jet pumps. The classification is done on the basis of depth of water that the pumps can draw. For shallow depths we have a different jet pump and for deep water we can use deep water jet pump.

We shall discuss about them in detail. They are given in the list below-

  1.  Shallow water jet pump- The name itself suggests that these pumps are used for shallow depths. They can work up to depth of 25 ft. The main idea behind a shallow water jet pump is that they have smaller impeller casings.
  2. Deep water jet pump– Deep water means that the depth of water is more than usual. The depths up to which deep water jet pump can work ranges from 25 ft to 110 ft.

Can you use a jet pump without using a pressure tank?

High pressure jets are used in jet pumps to displace the fluids from one place to another. While in almost every case, a jet pump uses pressure tank that provides high pressure to the stream.

The velocity of fluid is increased with the help of high pressure. The fluid is displaced using the pressure difference created inside the jet pump. However, we can use a jet pump without the help of a pressure tank. But it would cause wearing of the pump due to the pressure generated. So it is recommended to use a pressure tank in a jet pump. 

How far can a jet pump pull water?

We have studied about the different types of jet pumps and the depths at which they can be used. Theoretically, at ground levels the jet pump can pull water upto an average depth of 30 feet.

Near vacuum conditions can provide a lifting capacity upto 35 feet. The mentioned numbers are strictly for a shallow water jet pump. In real cases, due to many major losses, the number comes down to 25 feet! Mechanical losses and hydraulic losses contribute to reduction in this number.

Jet pump advantages and disadvantages

We have discussed in detail about the working of jet pump and its types. Now we shall discuss about the different advantages and disadvantages of using a jet pump.

The advantages and disadvantages of jet pump are given in the section given below-

Advantages

  • It has a great capability to provide high productivity.
  • Due to less mechanical parts in a jet pump, the chances of wear and tear are less.
  • The service life is very long.
  • The maintenance of this pump does not require much efforts and incurs less costs.
  • If we want to increase or decrease the productivity then with the help of a single injector we can achieve it.
  • The jet pump can run for longer durations without needing any assistance from us.
  • The jet pump has a very high tolerance against the abrasives present inside the fluid.

Disadvantages

  • Other artificial lifts are more efficient than jet pumps.
  • Space limitation is a major concern while using jet pumps.
  • Presence of very high pressure surface lines.
  • Very high power is consumed by jet pumps.

How does a jet pump work on a return fuel system?

Return fuel system is used in internal combustion engines, it comes with a hose that is connected with a carburettor. Sometimes excess fuel is left after a complete combustion cycle, this excess fuel is sucked in by the return fuel system.

Fuel is under high pressure inside the engine cylinder, due to the high pressure a suction is created due to the venturi action inside the pump. As a result of this, excess fuel is drawn towards the fuel tank. The fuel flows through auxilliary pipe system present inside the cylinder.

How does a two line jet pump work?

The name of this jet pump suggests that it uses two pipes. Larger pipe is used for upstream and smaller pipe for downstream.

The two line jet pumps are assisted by venturi that is situated at the bottom of pipes. Water is pumped upward using this venturi. Two line jet pumps can be used in wells, a lake or sometimes even in a water tank.

How does a convertible jet pump work?

This type of pump is versatile in nature. It is mainly used in applications like pumping water from lakes, wells or sprinkler systems.

The same principle that is used in jet engines is used in convertible jet pumps. In convertible jet pumps also, we use nozzle and venturi to pump the water. The internal components of a convertible jet pump is made up of thermo plastics and some times iron too. Since thermo plastics are weaker than iron, the iron parts are long lasting than those made up of thermo plastics.

How does a jet pump work for a jet ski?

We all can refer to jet ski as a water bike. It resembles a bike with the only difference that it runs on water. Jet ski can achieve high speeds, these speeds are achieved with the help of a jet pump.

The jet ski uses the third law of motion to move forward. When we apply the throttle, a centrifugal pump inside the jet ski starts moving as a result of which water is sucked in. The water is taken from the water body itself. The water passes through a nozzle and exits with a very high velocity. Due to high exit velocity the water pushes the jet ski in the forward direction.

Abhishek

I, Abhishek Khambhata, have pursued Btech in Mechanical Engineering. Throughout four years of my engineering, I have designed and flown unmanned aerial vehicles. My forte is fluid mechanics and thermal engineering. My fourth year project was based on performance enhancement of unmanned aerial vehicles using solar technology. I would like to connect with like minded people.

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