It's important that you know the flow rate of your system. Flow rate is how much fluid you can transport within a given time. Knowing this helps you achieve two critical things:
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- You can assess if an existing system isn't working efficiently. If you know the flow rate you should be achieving and yet your system is not performing, then you can take the necessary action.
- You can determine the exact set-up you will need to transport, at the volume you require.
Calculating Flow Rate During Planning Stages
Determining the flow rate you will need is an essential part of planning your system design, before you go ahead and order or install your new pump. If you get this wrong, then you might have to invest money in replacement equipment which could seriously impact your budget.
The equipment most suited to your specific needs will be reliant on three things:
- The type of fluid you need to pump
- The distance it has to travel from point A to point B
- The volume of fluid which needs to be transported in a given time to make the system economical
All of these considerations will be specific to your project. The volume of fluid you wish to transport over a given time will be your flow rate, while the type of material and the distance between input and output will affect the flow rate you can realistically achieve. Therefore, these three aspects of a healthy system are all interlinked.
If possible, the best way to ensure that you order the correct equipment is to contact an expert who can then suggest the equipment you should buy.
Assessing Flow Rate in a Functioning System
Let's say, for example, that you need to move 200 litres of a fluid every 20 minutes. That means your equipment, have to be able to produce a flow rate of 20 litres per minute, or 3.33 litres per second.
Once your system is installed and you have chosen the correct pump for the job, you will need to assess the system's performance. There are a number of factors you could measure, but right now we will stick with flow rate. To measure the flow rate of your system you can:
- Use a Flow Meter: This is a simple device which can measure the amount of fluid passing through it. Attach this to your discharge pipe, as close as possible to your pump and it should give you a reliable reading of your flow rate.
- Collect Fluid: If the fluid you are transporting is safe to use in this way, you can collect the fluid in a measuring vat or bucket (if the system is small enough, care must be taken). If you know how much the container holds, then you can measure the amount of time it takes to be filled. This will give you an accurate flow rate.
If the flow rate is not what it should be, given the expected performance of your installed pump, then you can move on and begin to assess each piece of your system for flaws. You may be interested in this blog: How Friction Impacts Head Pressure
Or, It could be that your pump is simply in need of replacement. If so, Global Pumps has a range of excellent industrial pumps available for any circumstance.
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How to Select the Right Size and How to Set the Feed Rate
Before you purchase a chemical feed pump, you should know essentially how many gallons per day it will need to supply. To determine this, there are few things you need to know.
1. The Output Rate of your well pump.
2. The Dosage Requirement for the chemical(s) you are going to feed into the water.
3. The Strength of the Solution you are feeding.
To determine the output rate of the well, use this simple system:
Be sure all water is turned off and stays off during your test. Select a tap in a location where you can observe the operation of the well pump, open the tap, and let the water run until the well pump comes on. Immediately close the tap and time how long the well pump runs until it shuts off. When the pump is off, use a bottle or bucket to measure the amount of water that can be let out of the faucet before the pump turns on again. Divide the amount of water, in gallons, by the time, in minutes, that it took to refill the tank. The result is the well's output in gallons per minute.
Example: It took the tank 2.5 minutes to refill and you counted 22 gallons drawn off before the pump restarted. Divide the gallons by the minutes and you find that you well's output capacity is 8.8 gallons per minute.
To determine the dosage requirement, you calculate what is needed to achieve your treatment goal.
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As an example, we'll say that your water has 2 parts per million iron and two parts per million hydrogen sulfide. It takes one part per million chlorine to treat each part per million of iron and 3 parts per million chlorine to treat each part per million of hydrogen sulfide. Plus, you should leave a one part per million residual. Therefore, your dosage requirement would be 9 parts per million.
(Note: We're using 1 ppm chlorine requirement to treat iron as a convenience. Standard charts can vary from 0.6 to 1.0 parts per million in their recommendation. See, for example, this chart on our site. Sizing and setting pumps is a trial and error process. If your estimate is a little off, you'll be able to correct it.)
Go here for requirements for feeding polyphosphate to sequester iron and hardness.
To determine the Solution Strength, you need to consider the strength in parts per million of the original substance and how much&#;if any&#;you are going to dilute it.
In our example, we'll use household laundry bleach as the source of chlorine. Straight household bleach is 5.25% chlorine. This means that bleach contains 52,500 parts per million chlorine. If you dilute a gallon of bleach with a gallon of water, the solution strength will be 26,250 ppm chlorine. To solve our example problem, we'll assume you're using full strength bleach.
To select a pump, try to choose one that will produce the needed gallons per day output at approximately the medium setting on the pump.
Required Feed Calculator
Please check highlighted fields. Enter your well output rate in gallons per minute, required dosage in parts per million, and solution strength in parts per million.
Enter your well output rate in gallons per minute, required dosage in parts per million, and solution strength in parts
per million, then hit "calculate."
Well Output:
Dosage Required:
Minutes Per Day:
Solution Strength:
Feed Required:
&#;
(Gallons Per Day)
Here's the formula:
-
Well pump output rate in gallons per minute, multiplied by
-
Required dosage in parts per million, multiplied by
-
&#;the number of minutes in a day&#;divided by
-
Solution Strength in parts per million, which equals
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Needed Metering Pump Output in gallons per day (GPD).
So, which pump do you buy? Here's the rule again:
To select a pump, try to choose one that will produce the needed gallon per day output at approximately the medium setting on the pump.
In our example, this would mean that ideally you would want a 4 or 5 gallon per day pump. But, we don't sell a pump in this size (and you certainly want to buy a pump from us&#;right?). So, what we would suggest is buy the 10 gallon per day pump and dilute the feed solution with a gallon of water. This will give you a solution demand of about 4 or 4.5 gallons per day. This will allow you to set the pump's one-to-ten pump rate at 4 or 5. It allows room to adjust in either way to increase or decrease the chlorine dosage.
Another tip to keep in mind when sizing a chorine pump. This is from a Water Technology technical article: &#;The stronger the chlorine solution, the faster it will lose its strength. A 2-parts-water-to-1-part-chlorine solution will lose strength much faster than will a 5-parts-water-to-1-part-chlorine solution.&#; Therefore, you get a more predictable result if you'll buy a larger output pump and mix your solution thinner.
If you need help in selecting a pump size (and most customers do), don't hesitate to call or .
Contact us to discuss your requirements of Ceramic Dosing Pump. Our experienced sales team can help you identify the options that best suit your needs.
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