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Hi danw2 Yes. I have seen all the explanations in FAQs. I wanted specifically the formulae being used in the software from Roark's, and the corrections that Miller uses. Kindly clarify.

Dear All How do i calculate the required thickness of a Restriction Orifice plate for Higher Pressure drops about 14 kg/sqcm). I have the Miller formula from the Flow measurement engineering Handbook, but I am looking for formulae (Roark's) to calculate thickness if a) the Plate is to be...

thanks chemlite

Thanks chemlite. Its running now. I have the nozzle.xls file where i am trying to find out the Outlet temperature and Pressure. How do I do it in Prode? Inlet temperature-264 Deg.C, Pressure is 50 kg/sqcm(g). Downstream is at atmospheric pressure. Hence i guess, Pout should be 1 atm. What would...

thanx chemlite. let me reinstall. i think excel is 32 bit

Windows 8 (64 bit)

thanks chemlite and GHartmann. I am unable to run Prode as there is a DEBUG error creeping up in Excel. something to do with the dll file. unable to solve the issue.

Thanks Chemlite. I would also like to know which is the correct method to be used in ASPEN HYSYS?

Hi all Could some one enlighten me on whether Beggs&Brills method is the best way to calculate Pressure drop in Steam Lines ? regards

I have been able to do both. Consistent results Thanks MortenA.

Yes, you are correct, MortenA. That's what I am doing. But the question is how big should the valve be. A Cv value would have warned me the pressure built-up upstream more accurately during the relief valve flow.

Pmatherne /MortenA Unfortunately the Relief valve vendor doesn't know "who" a Cv is. He would happily tell me the maximum relieving capacity & the Discharge coefficient. Ofcourse I know the orifice dimensions. I was trying to simulate a network with a PSV (compressible flow) and estimate...

I was looking for a rigorous calculation to arrive at a Cv value. Equation Cv = 27.66 x A x Cd would still be an approximation. ANSI/ISA 75.01.01-2002 (Flow equations for sizing Control Valves) contains a flowchart for the routine alongwith the equations.

Hi all I think a 10" tailpipe would do the job (an expander 6"x 10" at the relief valve outlet matching flange) and the back pressure would be around 4.8 kg/sqcm. Higher sizes than 10" wouldnt make any more difference. and Pray that the valve would never have to pop!!! ThanQ all, specifically...

thread1203-174188 Hi all Is there a way to calculate a Cv (flow coefficient) for a Relief Valve ? Kindly post

I am assuming that the Flange material is ASTM A105. I think the flange rating of 900# allows hydrotest pressure upto 235 kg/sqcm (Pls check hydrotest temperatures in B16.5). The pipe material needs to be check for stresses developed due to hydrotest pressure. Normally, stresses upto 90% of...

But wouldnt choked flow of the Relief valve be the value of 98TPH provided by the Relief valve vendor? I looked up at the sizing datasheet of the relief valve for the value (Actual Relieving capacity of Valve). Have I got it all wrong?

Sure latexman. Thanq for your tip. Wil get back to the forum

Choked flow at the nozzle. Nothing can be done about it any way as the Relief Valve orifice is fixed. regards

In addition, any area change (reducers) would choke velocity. Kindly add your views.