- What do I need to know to size a dosing pump? (metering pump)
- Why is pressure required to size a dosing pump? (metering pump)
- How does one select the pump head material?
- How does one select the correct valve material?
- Why do I need to know the concentration of chemical being dosed?
- Voltage, why is it important to specify?
- My chemical useage is fluctuating, why?
- My chemical usage has increased, why?
- My chemical usage decreased, why?
- What is a flooded suction?
- What is NPT?
- What is g.f?
- How long can the discharge tubing length be?
- What is bar?
- What is the maximum suction the diaphragm pump will draw?
- How to prime the pump?
What do I need to know to size a dosing pump? (metering pump)
Flowrate: volume in a period of time i.e. gph or l/h.
Pressure: (at the injection point): this may be atmosphere in the case of an open tank or some pressure for injection into a water line
Pumps are rated with a flowrate at a given pressure.
Pump capacity (flowrate) is inversely proportional to pressure.
This means a pump rated at 10 l/h 142 psi (10 bar) will deliver more fluid at a lower pressure than 142 psi and less fluid at a higher pressure than 142 psi.
Your pump sales person will usually want to know a little bit about the application inorder to suggest the best pump for the application.
Why is Pressure required to size a dosing pump?
Why is pressure required to size a dosing pump? (metering pump)
Inorder to avoid selecting the incorrect size of pump for your application.
ie. A chemical is required at a rate of 8 l/h. No pressure is specified.
There are a number of pumps which could deliver the required 8 l/h in our diaphragm pump line.
How does one select the pump head material?
How does one select the pump head material?
Pump head material is very important when dealing with chemicals. Some chemicals are not compatible with polypropylene for example, and another pumphead material will have to be selected for the application.
How does one select the correct valve material?
Valve material is very important when dealing with chemicals. Some chemicals are not compatible with stainless steel for example, and another valve material will have to be selected for the application.
Concentration of chemical being used? Knowing the concentration of chemical is important to know for material comparability for the wetted parts of the pump.
- pump head
- valves
- tubing
Voltage?We sell different voltage rated equipment. 110 VAC or 220 VAC for controllers, peristaltic pumps, and solenoid diaphragm pumps
For example in North America, 110 VAC is the common household power, however certain industries or application 220 VAC is used.
Some of our products have universal power. 90-240 VAC 50 or 60hz so the challenge of voltage has been partially addressed.
While other equipment such as motor operated pumps are available in:
single phase 110 VAC /60hz
single phase 220 VAC/ 60 hz
single phase 220 VAC/50hz
3 phase 240/400V /60hz
………………..there are others.
Why is my chemical usage is fluctuating?
There are a number of possible reasons: (assuming the pump is functioning correctly)
1. kink in the tubing
2. suction is plugged or partial plugged
3. pressure at the injection point is fluctuating ( back pressure regulator may be required)
My chemical usage is down? why
The pump settings have been tampered with
Suction is plugged or partially plugged (check the foot valve)
Tubing kinked. (check tubing)
Check valves in the pump head have reached the end of their life (change valves)
Pressure at the injection point is higher than it was when pump was set up
The pump settings have been tampered with
Injection valve is not working correctly
Pressure at the injection point is lower than it was when the pump was setup
The chemical reservoir is at a higher elevation than the pump suction.
What is NPT? Abbreviation for National Pipe Thread.
It is widely used in North America. It is a tapered thread, the seal is made on the threads
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What is g.f? Abbreviation for Gas Female thread
also known as BSPP
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How long can the discharge tubing length be?It is recommended to keep the discharge tubing 2 m or less.
The pump will work with a longer discharge tube, however there will be some loss of capacity due to losses in a longer tube.
What is bar?It is a unit of pressure widely used in Europe.
1 Bar is equivalent to 14.5 psi = 100 kPa