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Commentator

Join Date: May 2011
Posts: 76

Orifice Plate Bore Calculation! Help Please!

10/07/2012 7:18 AM

Hi,

It seems we have an Interesting Math quiz!

I have data sheet stating that Bita ratio (B) is 0.156869,

and B^2*K = 0.156869= Qm x Gb / (A x D^2 x Fa x Fr x sqr Gf x sqr h)

I know that:

Qm is flow rate, A is the area, D is internal diameters, h is operating density

what are the rest following:

Gb

Fa

Fr

Gf

????

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Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#1

Re: Orifice plate Bore calculation! Help please!

10/07/2012 8:03 AM

I put on Google search- Orifice plate Bore calculation -and got good hits. I request you to try for a change. If you can't get your answers, please come back to this thread.

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Commentator

Join Date: May 2011
Posts: 76
#2
In reply to #1

Re: Orifice plate Bore calculation! Help please!

10/07/2012 9:14 AM

Mr Joshi,

I am not asking about Orifice bore calculation!!

I am asking about a data sheets done by some one and I need to figure out those parameters!

please read question carefully mate!

your cooperation is appreciated

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Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#3
In reply to #2

Re: Orifice plate Bore calculation! Help please!

10/07/2012 10:10 AM

Fardan, this link, I hope, will provide you the answers. If you still miss some answer, please give feedback.

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Member

Join Date: Nov 2011
Posts: 7
#6
In reply to #3

Re: Orifice plate Bore calculation! Help please!

10/08/2012 2:15 AM

It seems that nobody here tries to understand the question and tries to answer. He is asking something and everybody is talking about different things.

He is asking about some terms used in orifice flow calculations.

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Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#7
In reply to #2

Re: Orifice plate Bore calculation! Help please!

10/08/2012 2:45 AM

Could you show what formula you are using, in which these parameters are shown? My search yielded the following:

Fa = thermal expansion factor of orifice plate

gf = specific gravity of liquid at flow conditions

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Associate

Join Date: Jul 2012
Posts: 39
#8
In reply to #1

Re: Orifice plate Bore calculation! Help please!

10/08/2012 3:11 AM

I can remember when this site was the first point of contact for people wishing to get answers to problems they had and, not Google. But it seems it has become a site for people to sit in their ivory towers and look down upon those who have problems and, just offer up ridicule. So what has this site become? And if people did ignore this site and, use Google ;where they would probably get their answers after alot of digging; where does it leave this site. Well probably without an audience and a pretty insignificant site; which it is most definately not. So please do not loose site of the reason this site came into existance. Not a place where people can look down their noses at somebody with a problem. But a community where people can come to resolve problems, regardless of how trivial one may think they are. If you still think that way, then just keep your mouth shut and, fingers off the keyboard.

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Guru

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Location: India
Posts: 1246
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#10
In reply to #8

Re: Orifice plate Bore calculation! Help please!

10/08/2012 4:39 AM

Your thoughts are indeed very illuminating. Did you read all the subsequent posts after post #1, which evidently irritated you to no end, before penning your post. May I invite you to kindly read all the posts till the end of the thread. It is always better to learn fishing instead of asking for the fish. The OP was not given sermons but was gently nudged to learn the art of finding answers oneself. You will notice that The OP was helped all along. You have liberty to your views & I will always respect that.

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Associate

Join Date: Jul 2012
Posts: 39
#11
In reply to #10

Re: Orifice plate Bore calculation! Help please!

10/08/2012 6:32 AM

You're missing my point entirely. This site is indeed a place to go fishing, why do you think it was setup in the first place. If Google can offer up all the answers to all the questions; which it may well be able to do; then there is no point to this site. This site like Google is just a pool of information. If you think the question is beneath you to reply to, then don't. Somebody else will offer up a relevant answer for the OP. My point is there can be many levels to this site, the level where people can go fishing for little fish and, then too you're level where they can fish for big fish. Sometimes people find it very difficult to dredge throught all the information, that can be found via Google. Here hopefully they can get somebody to give an answer, which is both straight to the point and explained in laymans terms.

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Associate

Join Date: Jan 2011
Location: Rotorua, New Zealand
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#4

Re: Orifice Plate Bore Calculation! Help Please!

10/07/2012 11:44 PM

before going any further with your formula I know that I am in trouble. A Beta ratio of 0.15 is way off accepted standards. Going below 0.2 is questionable. I try to stay above .3.

Your nett unrecovered head loss will not be good.

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Allan Evans
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Commentator

Join Date: May 2011
Posts: 76
#5

Re: Orifice Plate Bore Calculation! Help Please!

10/08/2012 1:54 AM

Do we have to know the pressure difference across the plate to do our calculation?

can we calculate the bore without knowing pressure across orifice,

all what is given is the operating pressure of the fluid, then we have to size the bore of the orifice.

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Guru

Join Date: Feb 2012
Posts: 595
#9

Re: Orifice Plate Bore Calculation! Help Please!

10/08/2012 4:02 AM

(nothing 2 2::)

B²K = 0.156869 = Qm·Gb/(D²·Fa·Fr·√(Gf x h))

about math. syntax ¹ = Alt+0185 , ² = Alt+0178 , ³ = Alt+0179 , √ = Alt+251 , ⌂ = Alt+127 , mu = µ = Alt+181 , pi = ¶ = Alt+181 or π = Alt+227 , diameter = Ø = Alt+0168 , () = empty set = ø = Alt+0184 , × = Alt+0215 or · = Alt+0183 , ÷ = Alt+0247 , αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ = Alt+224...Alt+254

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ci139
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Guru

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#12

Re: Orifice Plate Bore Calculation! Help Please!

10/08/2012 10:14 AM

First, we need to know the type of orifice plate.

Is it Concentric,Quadrant Edged,Eccentric,Segmental,or Segmental Wedge.

Then we need to know the type of fluid:liquid,gas,liquid with suspended solids,liquids with entrained gases,gases with entrained liquids,steam(wet or high pressure).

Fa is the orifice expansion factor

Gf is liquid specific gravity at flowing temperature

The other terms are not familiar to be,and may have been added since I was in the instrumentation field (30+ years ago), and the info from my books may be outdated.

A good modern flow data calculation book would be helpful in your situation.

Sorry I could not be more helpful.

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Guru

Join Date: Jun 2010
Posts: 1296
Good Answers: 104
#13
In reply to #12

Re: Orifice Plate Bore Calculation! Help Please!

10/08/2012 10:34 AM

Gb is base specific gravity

h is meter differential, not density

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Users who posted comments:

Allan Evans (1); bigg (1); ci139 (1); Dodgy Solenoid (2); Fardan (2); HiTekRedNek (1); Joshi (4); rehan (1)

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