Flowmeter design solves 120 year old problem
A
Flowline (UK) product story
Edited by the Engineeringtalk editorial team
Nov 15, 2002
Scottish Water was recently faced with an interesting problem at the Alnwick Water Treatment works in Edinburgh.
Scottish Water was recently faced with an interesting problem at the Alnwick Water Treatment works in Edinburgh.
In a pipe system dating back to the 1880s a failed (and ancient) venturi-type system needed replacement with modern technology.
One of the major considerations was potential intrusion damage to existing pipework.
Conventional standard flowmeters would require permanent inline location, with civil engineering costs running into many thousands of pounds.
Recent estimates from the industry suggest that in most permanent installations typical instrumentation costs are no more than 10% of the total project costs.
At Alnwick it was felt that, because of the age of the pipeline concerned, civil engineering costs would be an even bigger factor.
Happily, a solution requiring minimal invasion and installation time was provided by Flowline.
Multi-Mag is an insertion electromagnetic flowmeter which is introduced to the pipeline through a 2in valve usually installed using "hot tapping".
This allows the flowmeter unit to be inserted or removed without interruption to the flow.
Furthermore the Multi-Mag technology provides accuracy at least comparable to conventional flowmeters.
Following excavation down to the pipeline at Alnwick, the new valve and flowmeter were installed to the live main within two hours.
The total project, including full commissioning, took less than a day.
Multi-Mag, which is manufactured by Marsh McBirney, is widely used in the UK water industry and has also been specified by Southern Water, South East Water, Northwest Water, Anglia Water and Severn Trent.
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Insertion mag meter gives full-bore performance
The Multi-Mag is a novel insertion mag meter that does not require flow profiling and gives full bore meter accuracy even in nonideal flow conditions. -
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Noncontact clamp-on ultrasonic meters deal with the problem of measuring ultrapure water - which, strangely is extremely "dry". -
Portable flowmeter suits use in the field
Minisonic 80's noninvasive, external probes are simply clamped on to the pipe to facilitate quick installation and immediate measurement. -
Flow meter stays accurate up to 5m/s
The latest version of Flo-Dar from Marsh Mcbirney has new software which makes possible both a higher range of measurement as well as the capability accurately to measure flows up to 5m/s. -
Portable flowmeter stays accurate at low flows
The new Ultraflux Minisonic P ultrasonic portable flowmeter from Flowline features a number of major advances in signal interrogation, sensor construction and accuracy, particularly at low flow rates.
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