A jet pump is a mechanical engine that pumps fluids through a drive nozzle, converting the pressure of the fluid into a high-speed jet. This jet coming from the tip continuously draws the fluid from the inlet side of the pump. In the mixing tube, the trapped fluid absorbs a portion of the energy of the moving fluid.
A jet pump is a mechanical engine that pumps fluids through a drive nozzle, converting the pressure of the fluid into a high-speed jet. This jet coming from the tip continuously draws fluid from the inlet side of the pump. In the mixing tube, the trapped fluid absorbs a portion of the energy of the moving fluid.
The diffuser converts the fluid velocity to pressure. A water jet pump is a self-priming pump with no moving parts. This pump creates a fast jet of almost any fluid and drives another fluid by restoring pressure in the diffuser.
In jet pumps, two or more inlets are used to extract a constant fluid flow, and pressure is applied to produce a suction lift. The combination of velocity and inlet pressure of gases or liquids leads to the medium exiting through the pit, storage tank, or pump to the outlet point.
For some reason such as friction loss, the performance of the jet pump is lower than that of a normal centrifugal pump. However, jet pumps are more efficient when processing a gaseous mixed medium or under various downward conditions involving turbulence in the surface properties.
This pump has one or more triggers and diffusers. It installs to the ground, and it drains water from the ground through an entrance pipe.
These pipes are popular in areas with high water tables. Therefore, they are suitable for various residential purposes such as farms, bungalows, oil fields and small single family homes.
The use of a submersible pump is not recommended or, if prohibited by the local government, the use of a jet pump to pump water from a well.
How does Jet Pump work?.
A jet pump is an artificial lifting system that has two main parts:
- Surface pumping device.
- Downhole jet pump.
The jet water pump uses unbalanced air pressure in its work. Its work is very similar as the liquid is absorbed by a straw. First, the pump is filled with water. After joining, the pump allows the impeller to rotate and pass through water and air bubbles. During this process, air is expelled from the emergency shut-off valve, which creates a continuous section of low pressure, which naturally forces the groundwater upwards.
When fluid enters the jet pump, the area of the flow path through the right-sized nozzle decreases, thus expanding the fluid velocity and creating a venturi effect. The pressure difference created by the venturi effect draws fluid from the reservoir to the jet pump. Ventures can be separated by a certain distance from each other. The drive fluid and stored fluid mix, and the pressure rises as the velocity decreases along the flow path of the increasing area. The pressure increase is sufficient to lift the mixed liquid to the surface.
Jet pump installation guide.
Step 1: Repare a horizontal concrete base to mount the mono jet black and tighten the motor base with the base screws.
Step 2: Use the given pipe size as indicated on the product label.
Step 3: Ensure that the filter and return lines at the jet unit and suction nozzles with the foot valve are connected to the borehole (series DDSJ, DSJ, HCSJ). For the HCSJ series, make sure the attached filter is placed at the bottom of the borehole suction pipe.
Step 4: Priming
When you first run the pump, you need to prioritize it.
Air cock does not offer HCS 80/11 and TDSJ series. Do not add too much water when the pump is primary. Stop pouring water and put the filler cap back on.
If the water level in the pressure valve continues to drop during the filling / priming process, this indicates a leak and needs to be corrected.
Step 5: Set the pressure control valve to the maximum supply rate.
The simplest way to set the control valve for the best delivery rate is the display technique. With this technique, drive the pump to adjust the discharge rate and adjust the round head screw (15). Repeat with the round head screw (15) until the water flow to the supply pipe increases. Hex lock now. Nut (2) to prevent loosening of round head screw (15). To open the round head screw (15), the pressure valve cap nut (1) must be disassembled, tightened, and damaged to avoid damage.
Step 6: Installing electrical equipment
The single-phase jet monoblock must be grounded.
Make sure the electrical connections (if any) are properly and properly insulated.
Properly connect the cable to the starter clamp so that the connection does not come loose.
Low voltage operation should be taken into account when selecting the wire size.
Step 7: Connecting the power cord to the unsealed sewage pump.
Secure the motor’s internal wiring and front connection with the capacitor cables where the two wires appear from the junction box cover.
Only phase and neutral conductors can be connected to these two wires.
Jet pump types.
There are three main types of jet pump:
- Deep well pump.
- Shallow well pump.
- Convertible pump.
Deep well pump.
The deep well jet pump is used to pump water from deep underground wells. A deep well is an excavation system created to obtain groundwater. These structures are formed with the drilling method.
Deep well pump Water is not easily available mainly in rural areas. These pumps can lift water from about 22 feet to 120 feet by means of a suction lift. Deep well jet pumps use the principles of centrifugal pumps and fuel injectors to supply water that meets our needs.
Often these pumps are used to pump water to meet household needs. It is also known as deep well water pump.
Pros of Deep well pump.
- This requires less maintenance and a relatively low cost.
- Adapted to take water from different suction heads.
- Deep well jet pump has low cost.
- Easy maintenance.
- Long service life.
- It can be installed away from the water source.
Cons of Deep well pump.
- If the water level is below the valve below the inlet line, it should be filled with water.
- Only submersible pumps can be used for high suction heads.
- Abrasions in wells such as sand can damage the housing and the runner.
Shallow well pump.
These pumps are suitable for reservoirs or wells with a total pump height not exceeding 5.5 m. Shallow well jet pump is used for purposes close to the middle surface, e.g., residential wells.
The three main components of a shallow jet pump are the jet assembly, an impeller and an electric motor. The cost of drilling a shallow well is generally lower due to the small amount of labor and material involved. This pump requires wells less than 25 feet long. However, shallow pumps are not submersible. Alternatively, these were set in well covers.
Pros of Shallow well pump.
- This pump can compensate for the well.
- Can be changed to suit wells with different production rates.
- Simple machine, almost maintenance free.
- A shallow well pump is cheaper.
- It can be used for small diameter wells.
Cons of Shallow water pump.
- The efficiency of the shallow jet pump decreases with increasing total lift.
The convertible jet well pump can pump water from a depth of 70 feet. This is called a “convertible” pump because it can be used as a shallow well pump for water sources up to 25 feet deep and as a deep well pump for water sources up to 70 feet.
It uses when the pump is above the water source. The convertible jet pump uses two suction pipes to drain the water from the well. As the name of this pump suggests, you can connect the jet assembly to a suction tube and turn it into a shallow hole jet pump. This will reduce the depth of the water to 25 feet. Non-replaceable jet pumps can be used in shallow or deep well applications.
Pros of convertible pump.
- Low price.
- Requires minimal maintenance.
- Very efficient.
- Water can be pumped from deeper depths.
- Great ability.
Cons of the convertible pump.
- Slightly damaged by sand.
- Occasionally there are gas blockages.
Pros and cons of jet pumps.
Pros of the Jet pump.
- The jet pump has no mechanical or moving parts that can cause wear and tear.
- High productivity.
- It has a long service life.
- It requires low cost of maintenance.
- By adjusting the engine oil injection ratio, it can be adjusted to suit different productivity.
- Ability to walk for a long time without intervention.
- These pumps can be obtained and exchanged quickly and efficiently when maintenance is required.
- Very high tolerance to abrasions in prepared liquids.
- The use of CRA materials or inhibitors in the fuel fluid results in greater resistance to corrosive liquids.
- It can be used in wells with large deflection angles without damaging the pipe.
- The advantages of circulating the downhole pump both inside and outside the well include less idle time and the ability to remove the casing, cables or pipes without casing.
- It can handle high GLR.
- Suitable for long distance work.
- It can be mounted on a full air transport chuck with compression fittings and hose inserts.
- It can be installed on nipples and sliding sleeves with a cable.
Cons of Jet Pump.
- It is less efficient than other artificial lifts.
- Space limit issues.
- It has high-pressure surface lines.
- Space limit issues.
- It has high-pressure surface lines.
- It also uses more power.
Overheating in Jet Pump.
If a jet pump is constantly operating in the voltage range of 240 volts or below 170 volts, it will overheat.
The motor is fitted with a pump T.O.P (Thermal Overload Protector) to avoid excessive loads.
Difference between a turbine and a jet pump.
A turbine pump is a centrifugal pump that is basically installed underwater and connected to an electric motor (installed on the water surface) with the help of a shaft.
Turbo pumps are highly efficient and are mainly used for large pumping operations. This pump usually has different stages, with each stage basically stacked on top of the lower stage as a separate pump. It acts like pulling a train with more than one engine, and each stage is a machine. At its end is attached a large electric motor. A jet pump acts like a turbo pump, but delivers water to the inlet to help lift the water.