Chemical injection pump
What is a chemical injection pump?
Chemical injection pumps or dosing pumps are a type of pump that is used to introduce a specific chemical with a specific and precise dose into water or any other fluid. These pumps are capable of injecting various materials such as chlorine, acid, base, coagulants and.. Choosing the right dosing pump depends entirely on the type of chemical being injected. To choose the right dosage, we must pay attention to the corrosion of the injected material and its density. Also, due to the importance of accuracy in the amount of injection, the volume of the chemical per unit time and working pressure should be considered.
View Chemical Injection Pump Products
Chemical injection pumps are used in water treatment industries, food industries, industrial and manufacturing plants, agricultural systems, medical and non-medical laboratories, refineries and mining operations.
Etatron injection and dosing pump Antek pump is one of the most famous imported chemical injection pumps.
Chemical injection pump
One of the most widely used cases is the injection pump of chemicals in the water and wastewater treatment industry. for example:
Injection of antiscalant, acid, chlorine and sodium metabisulfide into the inlet water of desalination systems.
Add acid or base to water to adjust pH.
Chlorine injection to disinfect and kill water bacteria in the pool and jacuzzi.
Injection of coagulants into the inlet wastewater of treatment plants.
Types of chemical injection pumps
Chemical injection pump is designed in different types according to the function and pumping mechanism.
From the point of view of pumping mechanism, chemical injection pumps can be divided into the following categories:
Fixed diaphragm injection pump
This model of dosing pump is usually made in the injection range of 6 to 250 liters per hour, which includes a pump chamber that is filled and emptied by the piston. It also has an aperture and inlet and outlet valves. When the chamber is full, chemicals are injected at a constant flow rate.
Pulse diaphragm injection pump
This chemical injection pump uses a diaphragm mechanism and is controlled by an electric coil. In this dosing pump, the chemical is injected in a pulsed manner. The injection rate is set by adjusting the time interval between pulses. This pump is usually less accurate than other types, but is preferred due to its mechanical and electrical simplicity and relative cheapness.
Piston injection pump
In a piston chemical injection pump, the fluid flow passes through a set of lattice gear impellers. Due to the fact that the speed and volume passing between these impellers are not as accurate as diaphragm pumps and the impellers are prone to wear, the use of these pumps is usually recommended only when the fluid has a high density (to minimize wear). .
Peristaltic pumps
Peristaltic injection pumps use a flexible tube to transfer chemicals. This tube has a semicircular cross section and can be easily cleaned and sterilized. It can also be replaced in case of contamination or damage. Peristaltic pumps wear out faster and can not be used to pump at a high pressure flow.
View Chemical Injection Pump Products
Types of chemical injection pumps in terms of pump driving force:
Electric pump dosing (electric motor)
In a motorized injection pump, chemical dosing is performed using electricity and by moving the shaft back and forth connected to the diaphragm. This type of dosing pump is called a motorized injection pump and is usually used for injection at high pressure or high flow.
Solenoid Injection Pump (Electromagnetic)
In the structure of this type of pump, a magnet is contracted that has a magnetic field with the passage of electric current and moves the pump shaft to the left and right and injects chemicals.
Pneumatic dosing pump (pneumatic)
In this type of pump, wind pressure or other gases cause the shaft to move and as a result to inject chemicals.
What should be considered in choosing an injection pump?
Determining the flow rate required for injection is very important. For example, it should be calculated that a few liters of chlorine per unit time should be injected into a pipe or water tank to complete disinfection. By having the injection flow in hand, we can get the working range of the pump.
In order for the pump to be able to inject liquid chlorine into the water pipe, for example, it must have a pressure higher than the water pipe pressure in order to do this. Therefore, determining the pressure or so-called “head” of the pump is important from this perspective.
Determining the material of the pump head and diaphragm to prevent them from being corroded by chemicals is another important issue. Chemical injection pumps are usually provided with different heads such as: PVC, PP, PVDF, SS, which must be selected according to the system and pH of the injected chemical.
With the flow, head, pump material can be selected from the available tables of the desired pump.
Today, most advanced companies have put smart pumps on their agenda. These models of pumps can directly measure the amount of chlorine and pH of water directly or by means of separate sensors, and if necessary, inject acid, base or chlorine into the water in the required amount. Also, in pool and jacuzzi systems, analyzers can be used to control the entire injection system, which is the brain for controlling and measuring water.
Chemical injection system components
Although the components of a chemical injection system may vary depending on the brand and application, the main components based on performance and principles can be described as follows:
Reservoir or mixer – A reservoir where a chemical is supposed to be
The set is pumped into the fluid and poured into it. The dimensions of the tank and the amount of chemical in it must match the amount required for injection and the dosing capacity of the pump.
Strainer – is located at the beginning of the suction line and inside the tank. The filter smoothes out the chemicals and prevents the passage of coarse materials that cause the pump to fail.
One-way valve – A non-return valve that attaches to the suction line and prevents chemicals from returning to the tank.
Suction line – a pipe or hose that connects to the inlet of the injection pump and through which chemicals enter the pump from the tank.
Chemical injection pump (dosing pump) – The injection pump should be selected based on the required injection flow, line pressure and also the type of chemical to be injected. The body of dosing pumps is usually made of PVC, polyethylene and other plastics, rubber or corrosion-resistant steel.
Injection line – A pipe or hose from the pump body is connected to the pipeline through which the chemical is injected. Usually made of rigid PVC or polyethylene pipe or a reinforced hose, this part can have a variety of discharge valves, pressure relief or air release valves.
Injector and one-way valve – is a piece that is installed at the outlet of the pump and the injected material enters the injection line by passing through the injector. In some injectors, a one-way valve is placed inside the pump to prevent chemicals from returning.
Control System (Analyzer and Sensor) – Modern factories and smart pools use control systems and software to ensure accurate pump dosing and automation. For this purpose, central control systems or analyzers with pH, chlorine and. Sensors are used. Please note that many injection systems are installed without analyzers and sensors, and in this case must be set and operated by the operator.
Maintenance of chemical injection pumps
For each type of chemical injection pump, depending on its type and application and the chemical to be injected, various recommendations are provided for the maintenance of the pump. Chemical corrosion and operating conditions affect the life of components such as diaphragms and inspection valves.
Selecting the appropriate dosing pump and initial installation by a technical expert and providing suitable operating conditions at the pump installation site, plays an important role in the life of the pump and its parts. Also, inspecting the pump at regular intervals and having a regular and preventive schedule can minimize operational problems.
Maintenance of diaphragm pumps
Electronic diaphragm pumps usually need to be inspected and repaired every four to 12 months, depending on the application. In case of pump failure in short and frequent times such as damage to suction valves and other parts, the selection of the pump and its compatibility with the injected chemicals should be checked.
If you remove the dosing pump from the circuit, it is necessary to clean it by pumping fresh water for approximately 30 minutes. If you are looking for a thorough cleaning process, pump vinegar or citric acid into it to dissolve calcium and other mineral deposits that may have accumulated in the parts during the life of the pump.
Note: After cleaning the pump, rinse it thoroughly with water to ensure that the cleaning solution is thoroughly cleaned before the pump is put back into service.
Maintenance of motorized pumps
Dosing motorized pumps should also be maintained and inspected in accordance with the stated principles. Motorized injection pumps require gear lubrication or actuator oil for proper operation. For optimal performance under normal conditions, the gear grease must be replaced every 1500 hours. Drive oil must be changed after the first 1000 hours of operation. After that, the oil must be changed again every 5,000 hours or annually (whichever occurs earlier). Depending on the manufacturer, it is recommended that after every 5,000 working hours, an inspection be performed to repair and change the oil.
One of the basic principles of maintenance of injection pumps is to pay attention to pump leaks. If the injection motor flange is leaking, the sealing gasket must be replaced. If the shock adjustment knob is leaking, replace the adjustment seal. You may need to contact the seller for assistance. Some pumps have a leak detection port that helps the user notify of leaks. If your pump has this feature, determine if the product collected at the detection port at the end of the liquid is lubricating oil or pumped fluid. If the liquid product is pumped, replace the diaphragm. If the product is a lubricating oil, change the oil.
Maintenance of peristaltic pumps
Peristaltic pumps require little maintenance, but require routine inspections. The most common cause of peristaltic pump failure is improper maintenance. Cracking or discoloration of the hose in the first week of work indicates that the injected material is incompatible with the hose. Always pay attention to the pump hose, as this hose is the main contact of the pump with chemicals. If the pipe becomes swollen or discolored, replace the damaged pipe immediately to eliminate the possibility of pump failure. It is impossible to predict the service life of the hose, but by timely replacement of the damaged hose, damage to the pump and other equipment can be prevented.
By choosing the right chemical injection pump for your intended application and constantly monitoring its condition, you will ensure a healthy life cycle for your pump operation. Remember to watch out for corrosion and leaks and listen to unusual sounds. Recognize these common problems before
It will save you a lot of trouble by causing the entire system to crash.
Chemical injection pump
Supply of goods and equipment for industrial water treatment 0 Comments 22 October 2017 Insert time: 13:39
Injection pump:
The job of a chemical injection pump, or dosing pump, is to inject a certain amount of chemical (or any other fluid) into a process.
The driving force of these pumps is often electricity (electric motor).
Since the injection pump in the water industry is often responsible for injecting chlorine, Smbs, antiscalants and chemicals, the diaphragm of each pump should be carefully selected according to the type of injection material. Injection pump head can be of PVDF, PVC, PP, PE and 316 SS.
Injection pump
Khaneh Ab Company, as an importer of Atatron injection pump and dosing pump of Prominent and FWT injection pump, has offered a wide range of chemical injection package and dosing pump.