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askaripour
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Join Date: Jan 2010
Posts: 26

Ultrasonic Flow Transmitter

08/15/2012 12:17 AM

Hi!

We must use an ultrasonic flow transmitter to measuring flow of a 1800 DN water line which is equipped with Cathodic Protection System. Since location of installation of the transmitter is a part of this protection system i want to know dose affect a cathodic protection system and its related electric current, function of ultrasonic flow transmitter?

BR!
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lyn
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Join Date: Oct 2008
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#1

Re: Uktrasonic flow transmitter

08/15/2012 1:33 AM

No.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#2

Re: Uktrasonic flow transmitter

08/15/2012 3:23 AM

No, though the reason why an ultrasonic flowmeter would be used for cathodic protection, and not a sactificial electrode of lower value and no other function, is abstruse.

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askaripour
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Posts: 26
#3
In reply to #2

Re: Uktrasonic flow transmitter

08/15/2012 4:25 AM

this flow meter measures only the water flow and cathodic protection system dose its task independently.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#4
In reply to #3

Re: Uktrasonic flow transmitter

08/15/2012 6:27 AM

Thanks for the clarification.

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leveles
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Join Date: Jan 2008
Posts: 1753
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#5

Re: Ultrasonic Flow Transmitter

08/15/2012 10:43 PM

No. Apples and oranges.
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Ramu1960
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Join Date: May 2012
Location: Bangalore, India
Posts: 13
#6

Re: Ultrasonic Flow Transmitter

08/16/2012 12:37 AM

NO problem with the CP system installed.This flowmeter sensor will send and receive only ultrasonic signals it will not be affected by the cathodic protection system,but measures the flow.
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Geoffrey36
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Location: Up an araucaria araucana tree, South London, United Kingdom
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#7

Re: Ultrasonic Flow Transmitter

08/16/2012 4:15 AM

I had this problem in Barcelona many years ago, where two pipes with different CP installations were in proximity (separate Owners). There is one aspect that may be worth consideration. If the body of the flowmeter is connected to the return side of its electronic circuit and the latter is not connected to the pipe itself, a parasitic current may flow, diverting some of the cathodic protection current.

Two solutions are (i) ensuring electrical isolation (floating) of the circuitry of the flowmeter and its external connections or (ii) ensuring that the return sides of the cathodic protection and the flowmeter are electrically tied together. Personally, I prefer the isolation, if the flowmeter design permits it.
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lyna4
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Join Date: Dec 2009
Location: algeria
Posts: 22
#8

Re: Ultrasonic Flow Transmitter

08/16/2012 8:07 AM

Hi,

I think all of Askaripour, Ramu1960 and .Geoffrey are right in their answers, thanks.
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askaripour (1); Geoffrey36 (1); leveles (1); lyn (1); lyna4 (1); PWSlack (2); Ramu1960 (1)

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