Flow meter Selection

Have you considered an ultrsonic meter?

Ultrasonic Flow Meter is best suited. As per the vendor it is also much cheaper to Mag flow meter.

We can provide a clamp-on type ultrasonic flow meter with low price and good quality.Of course, it price is much cheaper than Mag flow meter.

Simon

Abest Technology and Instruments

Dear,

I think clamp on Ultrasonic Flow meter will solve the purpose.

Similar kind of flow meter, we are using in my project having more or less same application.

Can u tell me how is the performance of meter. Also during deposition of Mud/Sand do we need to recalibrate the mete? And what parameter need to be adjusted on site. Does deposition of Mud/sand has any impact on velocity & area. As per vendor Due to Mud the area of crossestion will be reduced and ve,locity will increase. Is it true? if yes then what is to done?

Yes, with mud deposition, the area of flow cross section reduces. But all these flowmeters give us flow value from multiplications of Velocity (measured by meter) and the assumed (or initial) C/s area. Thus with constant flow velocity, even though the C/S area reduces with deposition, meter shows same flow rate (though actual flow rate reduces). There is no solution to this problem in Ultrasonic / mag flowmeters. Best way is to provide some tap at the bottom to drain out the mud deposition and keep the flowmeter clear of mud.

With reduced C/S area, weather flow velocity increases or not depends up n many other factors. It can not be decided, unless all other parameters are defined.

We have also have had success with insertion type ultra-sonic meters. Better accurracy and can be inserted through a standard tap on the main.

Insertion type measures velocity at single point and assumes that as average velocity. With this velocity it calculates the flow rate by simple multiplication of velocity X Cross sectioanl area.

Thus, insertion flowmeter is never accurate (irrespective of what manufacturers claim). So never go for insertion, if you need accurate results.

Magmeter or ultrasonic flowmeter are the appropriate equipment.

contact www.shanbhags.com

Ultrasonic clampon meter is best for your application.

can u explain you judgenent?

Yes,Ultrasonic is a good option andnext comes the Electromagnetic. Also check is The latest Aerospce technology used VERABAR Flowmeter, I am not sure if we can use it for such a large pipe. But, there is an option like inserting two SINGLE ROD PARTIALLY INSERTED VERABAR Flowmeters from bottom and top and we can claibrate the flow using the transmitter. Verabar Flowmeter is a latest development made by VERIS of USA and is proved to be the best of its kind. It also works on the DP principle and is very accurate in its reading. We are using it in our Blast Furnace. You can use it for even Dirty water or gas. Please check with Veris corporation for further details. Their service is also excallent.

Mag flow meter will have problems with the mud covering the electrodes on each side. If that isn't a problem then the best one would be the mag flow meter. Clamp on's I don't really care for because (especially if it is in a hot environment) the contact jelly melts out and the electroded become dry and they loose their flow reading properties over time. I don't think a venturi and delta P transmitter would work very well in a mud environment. Bottom line is, I'd go with the mag flow meter.