Help choosing a flow meter
Thread Content
For in-factory metering, the medium is corrosive oil, the temperature is 0 to 80 degrees, and the fastest flow rate is about 100 cubic meters/hour. It must be able to be accumulated. Since it is settled in the factory, it does not need to be very accurate. The cheaper the better! Someone recommended a mass flow meter to me, and I consulted it. It was too expensive, and we don’t need to know the weight, just the volume. I wonder if electromagnetic ones can be used? There is also an ultrasonic one, I don’t know if it is expensive or not, I hope you guys can give me some advice. This post was last edited by naska on 2008-3-12 21:46 ]
It is recommended to use a target flowmeter, its measurement accuracy is okay!
Ask the manufacturer of siding boards if they can be used and which one is cheaper?
For corrosive media, a target flowmeter is not suitable. If the medium is not very corrosive, you can consider using a volumetric flowmeter. If the medium is highly corrosive, you can consider using an ultrasonic flowmeter. There is a clamp-on type that is very convenient and can be installed and measured without opening a hole in the pipe.
The medium is corrosive oil, so differential pressure and the like must not be used. If it leaks, it's bad. You can consider using a rotor type.
It is recommended to use an elbow flow meter for measurement. The principle is similar to that of an orifice plate. Both use differential pressure measurement and the accuracy is also good. Installation is simple and adds no extra resistance, and as for accumulation, it shouldn't be a problem.
I think ultrasonic is more suitable. You can use an external clamp-on ultrasonic flow meter. The flow meter probe is clamped on the pipe and does not come into contact with the fluid. This way you don’t have to consider the anti-corrosion problem of the material. Installation and disassembly will not affect the pipeline operation. It is more convenient. The price is very expensive two years ago. I don’t know now.
Try a wedge flowmeter, which was once used on heavy oil.
The optional LL-F stainless steel waist wheel flowmeter is a volumetric flow measurement instrument. The measurement part of the flowmeter is made of stainless steel and has strong anti-corrosion properties. It can be used for flow measurement of water-containing corrosive crude oil or other corrosive media. This flowmeter can display the accumulated flow rate on site and is equipped with a remote transmission output interface. It can be equipped with a photoelectric converter to output electrical pulse signals or analog signals. When matched with the flow totalizer, it can perform remote measurement, display and control.
In fact, the conditions you mentioned are not very harsh. As long as the requirements are not very high, I think many things can be used.
First of all, your medium contains corrosive oil, so differential pressure flowmeters cannot be used because they are easy to block, so the elbow flowmeters and wedge flowmeters mentioned above are not suitable. And if you are measuring in the factory, I suggest that you use a domestic electromagnetic flowmeter to meet the requirements, and it is not expensive. Just require corrosion-resistant linings and electrodes when selecting the model! As for manufacturers, we have used Siemens (formerly Danfoss, more expensive), Sichuan Instrument, Tianyi, Fuzhou Fuguang Baite, Zhejiang University Zhongkong, etc.! !
The view upstairs is very good, but we must pay attention to two points: 1. What is the conductivity of oil and whether it can meet the requirements of electromagnetic flowmeter? ； 2. Which material can meet the requirements for corrosive media? Since the electrode material can resist corrosion, wouldn't it also be able to meet the requirements if other flow meters are made of corresponding materials?
Compared with flowmeters made of POM materials, such as impellers and gears, pulse output flowmeters can be installed with a secondary meter and cost very little. Electromagnetic ones are not recommended as the conductivity of oils is usually too low. The prices of mass flow meters and ultrasonic flow meters are too high, and they are deceiving people.
POM's temperature resistance is slightly worse, so other materials can be used. There is nothing wrong with 80 degree plastic ones