How do chemical feed pumps work?
Chemical feed pumps work by injecting the selected chemical under pressure into the water stream. Such pumps are used almost exclusively to treat well water, and the most common point of injection is between the well and the well’s pressure tank. Chemical Feed System–Classic Setup.
What is chem feed?
Chemical Feed Systems are designed for automated chemical injection into the chemical feed tank for water or wastewater treatment. In the dosing process, chemical reagents are added into a water stream at a precisely controlled rate with positive displacement metering pumps.
How do you size a chemical feed pump?
When sizing the pump, the pump should be set 50-70% of its maximum output to maximize efficiency and not overrun pump. The 3 gpd pump would be set to inject 1-1.5 gpd; the 10 gpd would be set to inject at 3-5 gpd. In the example above, our “required feed rate” is 0.41 gpd.
How does a chemical metering pump work?
A metering pump is a device used to control the flow rate of a fluid typically it moves a precise volume of liquid in a specified. Time period metering pumps pump water chemicals solutions.
What type of pump is a chemical feed pump?
positive displacement pump
A chemical feed pump, also known as a dosing pump, is a compact positive displacement pump that injects a precise amount of chemical or other substance into water, gas or steam.
How do you calibrate a chemical feed pump?
Calibration Procedure
Calculate the capacity of the pump at the speed and stroke rate at which the test will be run. Fill the calibration cylinder with the product that the pump is feeding. Record the starting level of the calibration cylinder. Run the pump for the desired amount of time, generally 0.5 – 1.0 minute.
How do I choose a metering pump?
With that in mind, a metering pump should be sized so that the maximum expected flow rate is 85% to 90% of the pump’s capacity, which will leave room for additional capacity, if needed. The minimum capacity should never be less than 10% of the pump capacity to maintain accuracy.
How do you calculate pump output?
Pump Output Calculation for Duplex Pump and Triplex Pump
- Triplex Pump Output = 0.000243 × (Liner Diameter ) 2 × (Stroke Length) Where,
- Triplex Pump Output = 2.3576 × 10-9× (Liner Diameter ) 2 × (Stroke Length) Where,
- Duplex Pump Output = 0.000162 × S × [2(D)2 – d2]
- Duplex Pump Output =1.57172 × 10-9 × S × [2(D)2 – d2]
Which pump is commonly used for metering pump?
Traditionally, plunger or piston pumps, diaphragm pumps or peristaltic pumps are used for metering and dosing duties.
Which pumps are commonly used for chemical dosing?
Gear pumps, piston pumps, peristaltic pumps, and diaphragm type pumps are all available pumps to consider when injecting chemicals.
What is chemical feeder?
A chemical feeder is a quick and effective way to sanitize your pool or spa. They allow the proper flow of chlorine and bromine throughout your pool or spa without over or under sanitizing it. Instead of manually mixing large chemicals, a chemical feeder lets you simply fill the feeder and have it do all the work.
Why do we need to calibrate pump?
Calibration of chemical injection pumps is important to ensure that the proper amount of water treatment products are being fed to your systems. All chemical feed pumps are designed to pump at a certain rate; however, the actual flow rate can vary depending upon many conditions.
What is pump calibration?
Calibration pumps are used for testing and calibrating pressure instruments. A calibration hand pump used with a reference pressure gauge has the advantage of minimizing the cost and complexity of pressure calibration.
How do you size a chlorine dosing pump?
Multiply the Flow Rate (in gallons per minute) times the Applied Dosage in Parts Per Million Desired times 1440. Then divide by the Solution Strength being used. Household bleach is approximately 5% chlorine, pool chlorine is 10 to 12%.
What is a good pump efficiency?
Many medium and larger centrifugal pumps offer efficiencies of 75 to 93 percent and even the smaller ones usually fall into the 50 to 70 percent range. Large AC motors, on the other hand, approach an efficiency of 97 percent, and any motor—ten horsepower and above—can be designed to break the 90 percent barrier.
How can I increase my pump efficiency?
7 ways to improve the energy efficiency of your pump
- Avoid oversizing the pump.
- Impeller trimming.
- Variable frequency drives.
- Parallel pumping systems.
- Limit pipework pressure loss.
- Eliminate unnecessary use.
- Carry out maintenance.
Are metering pumps self priming?
This positive displacement pump is self-priming and can handle high suction lift applications. The downside to positive displacement pumps in metering applications can be their inability to run dry. Piston / diaphragm metering pumps are frequently used in municipal applications for dispensing PH additives.
How do you adjust a metering pump?
Since a metering pumps is usually a positive displacement pump there are two possible ways of controlling the flow capacity. The first one is by adjusting the volume of liquid displaced per stroke of the pump and the second is by adjusting the speed of the strokes.
How many types of dosing pumps are there?
There are 4 different types of dosing pumps designed based on their action and pumping mechanism: Diaphragm-Type Constant Injection Pump – This is a pump chamber filled and emptied by a piston.
What is a chemical pump?
Chemical pumps are used in the petrochemical, food processing and chemical industries as well as in off-site applications of refineries and in high-temperature heating systems. They pump hot, cold, aggressive, volatile, explosive, toxic, contaminated and especially valuable liquids.
What are the steps of calibration?
The method is as follows: Apply the lower-range value stimulus to the instrument, wait for it to stabilize. Move the “zero” adjustment until the instrument registers accurately at this point. Apply the upper-range value stimulus to the instrument, wait for it to stabilize.
How do you calibrate a pump?
How do I choose a dosing pump?
Typical specifications to consider when selecting dosing pumps are flowrate, pump head, pressure, horsepower, power rating, and operating temperature.
How do you calculate chlorine feed rate?
Step 3: Use Feed Rate calculation to solve for lbs/day
lbs/day = flow x dose x 8.34 = (0.4)(2.8)(8.34) = 9.34 pounds of chlorine is required.
Which type of pump is most efficient?
The most efficient type of pump is a rotary vane pump. This type of pump has a maximum efficiency when the fluid is moving in a circle. Other types of pumps have different efficiencies when pumping different fluids.