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mohsinhamid
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Join Date: May 2011
Posts: 91

Why is the Maximum Turn-Down Ratio Chosen?

04/06/2015 7:17 AM

For selecting orifice plate or any transmitters, it is recommended to select maximum TURN DOWN ratio... why...? please someone explain.

if minimum TURN DOWN ratio is selected what problem occurs..???
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phoenix911
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Join Date: Aug 2007
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#1

Re: why maximum turn-down ratio is choosen..??

04/06/2015 7:27 AM

Turn Down Ratio?

Are you talking about a NG burner?

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lyn
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Join Date: Oct 2008
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#2

Re: Why is the Maximum Turn-Down Ratio Chosen?

04/06/2015 9:18 AM

Turndown ratio - Wikipedia, the free encyclopedia
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Iris
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Join Date: Jul 2010
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#3

Re: Why is the Maximum Turn-Down Ratio Chosen?

04/06/2015 11:36 AM

Study the graph, typical error of an orifice plate DP flow measurment vs flow rate, to see how quickly a DP flowmeter develops a large uncertainty:

Where is your limit of acceptable uncertainty?

Whatever that flow rate limit is, in comparison to the max flowrate, is turndown.
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