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prajalpatil
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Steam Flow Measurement for Higher Line Size

05/05/2010 11:39 PM

Dear all,

I have a LP steam line of 46". It is supplying the steam to some plant. Kindly suggest the suitable flow meter except Orifice and annubar.because

I can not use the orifice for such a big line size and annubar can not give a good reading for such application.
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Mikerho
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#1

Re: Steam flow measurement for Higher line size

05/05/2010 11:48 PM
  • What kind of accuracy do you need?
  • What are your limitations on pressure drop?
  • Is this a new line?
  • Has flow rate never been measured in this line before?

For this size of line, I think that an orifice meter would be one of the cheapest and easiest ways to go.

Anyway, answer my questions and we'll see what we can do.

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adeebulrehman
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#12
In reply to #1

Re: Steam flow measurement for Higher line size

05/09/2010 4:46 AM

How do you thing that orifice will work.

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Mikerho
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#13
In reply to #12

Re: Steam flow measurement for Higher line size

05/09/2010 5:10 PM

Like this:

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Anonymous Poster
#14
In reply to #13

Re: Steam flow measurement for Higher line size

05/10/2010 12:35 AM

You cannot use Orifice plate for ≥ 12 inch lines.

Annubar for ≥ 36 inch lines.

and this line is 46 inch????????????????????????????
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gsuhas
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#15
In reply to #14

Re: Steam flow measurement for Higher line size

05/17/2010 3:36 AM

Why not!

You can use orifice plate for any size of pipe line. You can calculate the pressure drop against flow rate (and other parameters). The choice depends up on the accuracy expectations.
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Anonymous Poster
#2

Re: Steam flow measurement for Higher line size

05/06/2010 1:02 AM

How about a steam flow nozzle:?

http://www.wyattflow.com/pdfs/fnp_techbrief.pdf
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PWSlack
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#3

Re: Steam flow measurement for Higher line size

05/06/2010 3:09 AM

46" is a "big" pipe. For smaller pipes, vortex-shedding flowmeters can give good results on steam service.

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prajalpatil
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#4
In reply to #3

Re: Steam flow measurement for Higher line size

05/06/2010 3:24 AM

that we know, please suggest about 46" line.
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gsuhas
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#5

Re: Steam Flow Measurement for Higher Line Size

05/07/2010 12:51 AM

Some more data will be needed to suggest anything:

Pressure of the steam

Mass flow rate max and min

What accuracy is expected
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Anonymous Poster
#6

Re: Steam Flow Measurement for Higher Line Size

05/07/2010 12:52 AM

Dear All,

For 46 inch line size you can use insertion type vortex or turbine flow meter for steam,

No pressure loss

High Accuracy

Regards

Adeeb ur Rehman
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gsuhas
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#7
In reply to #6

Re: Steam Flow Measurement for Higher Line Size

05/07/2010 1:00 AM

Insertion type is never accurate. It give local velocity. This need not be average velocity (and most of the time it it will not)
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munneykhan
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#8

Re: Steam Flow Measurement for Higher Line Size

05/08/2010 1:09 AM

better you go for electro magnetic flow meter.
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Mikerho
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#9
In reply to #8

Re: Steam Flow Measurement for Higher Line Size

05/08/2010 1:21 AM

Incorrect, sir.

From WIKI:

The magnetic flow meter requires a conducting fluid, for example, water that contains ions, and an electrical insulating pipe surface, for example, a rubber-lined steel tube.

Steam is not a conducting fluid, containing a very low concentration of ions.

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PWSlack
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#17
In reply to #8

Re: Steam Flow Measurement for Higher Line Size

05/18/2010 10:43 AM

Electromagnetic flowmeters cannot be made to work on steam, as steam is non-conductive.

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Anonymous Poster
#10

Re: Steam Flow Measurement for Higher Line Size

05/08/2010 5:14 AM

I would suggest a doppler type velocity meter. With pressure and temperature compensation added to the velocity, a very accurate value can be obtained.

Consult Foxboro,Combustion Engineering,honeywell or other instrument manufacturer for details.There may be other options of which I am not aware, but an instrument manufacturer is the place to go fo advice on your application.

HTRN
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adeebulrehman
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#11

Re: Steam Flow Measurement for Higher Line Size

05/09/2010 4:43 AM

Dear All,

Please Note that for higher line size you can use INSERTION TYPE VORTEX or INSERTION TYPE TURBINE with an accuracy of ± 1%

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prajalpatil
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#16

Re: Steam Flow Measurement for Higher Line Size

05/17/2010 6:20 AM

Thank you all,

We have decided to go ahead with Flow nozzle.

Thanks once again for replies.......
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adeebulrehman (2); Anonymous Poster (4); gsuhas (3); Mikerho (3); munneykhan (1); prajalpatil (2); PWSlack (2)

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