Orifice Plate Bore Calculation! Help Please!

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.

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

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

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

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.

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.

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.

(nothing 2 2::)

B²K = 0.156869 = Qm·Gb/(A·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

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.

Gb is base specific gravity

h is meter differential, not density