7 replies to this topic

[akef]

hi
can you help me how to calculate the mass flow m2 on reducing station if i have the inlet and outlet parmeter as show on attached file??

Attached Files

•  PRV Spray Water (2).ppt   119KB   23 downloads

[breizh]

Can you tell us your difficulty ?
m2=m3-m1
m2 =(m3*h3-m1*h1)/h2

Breizh

[Shivshankar]

Hi akef,

Please uplaod your worked calculation sheet and let us know where you have obstacle. you have given us parameters and respective equation, so whats the problem ? you can calculate m2 ?

Regards
Shivshankar

[Robert Montoya]

Dear Akef is so easy:

M1+M2=M3
M1=84; M2? M3=126
M2=M3-M1
M2= 42 ton/h

[akef]

dear all
already i uploadwd my problem parmeter on attached file
my question is:
1- inlet superheated steam 60 bar, 487 degc, 100T/HR
2-inlet injection water 70 bar,124degc, m2=???
3-out let steam 1.78 bar,140degc, m3=126 T/HR that is my demand to my process
can you adivce me how i can obtain this demand??

[sheiko]

akef,
I believe there is a mistake in your data. The mass balance leads to different results than the enthalpy (h) balance proposed by breizh. I find M2 close to 30 T/HR with the second method.
Moreover, are your pressures in bar gauge or bar absolute?
I advise you check your data twice before asking twice.

Edited by sheiko, 14 March 2012 - 09:09 PM.

[S.AHMAD]

akef
1. You are confusing the problem by over specifying your parameters.
2. From what I understand is that you purpose is to meet the LP steam demand of 126 tph
3. Then you should be asking what are m1 and m2 values that meet the demand
4. Since you have two equations and two unknowns, then you can solve the problem easily.

[S.AHMAD]

m1 = 97.6 tph
m2 = 28.4 tph
m3 = 126 tph