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Hey,
I was wondering how to calculate the flow rate of nitrogen through a pipe from a tank which is at 80 psig. Here goes the configuration:
Piping is 2" diameter
Piping is about 25 ft long (1 90 degree bend)
A PCV is in the line dropping the pressure to 3 psig after the control valve (valve is 10 ft from the tank on the line)
The nitrogen is discharging into the atmosphere into a bag to puff it up.
What would the flow rate of nitrogen be into the bag?
Thank you
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Calculating Nitrogen Flow Through Pipe
Started by Guest_Guest_*, Sep 05 2005 02:55 PM
5 replies to this topic
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#2
Guest_aslan0_*
Guest_aslan0_*
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- guestGuests
Posted 10 September 2005 - 09:26 AM
The flow will be slightly less than tha capacity of the pressure control valve.
First of all you need to know the flow coefficient (Cv or Kv-value) of the installed PCV. You can find this value in the manufacturer catalogue.
Remark: delta P is limited to the critical pressure drop
dP is not (80 - 3) psi, but about 80 * 0.5 psi
First of all you need to know the flow coefficient (Cv or Kv-value) of the installed PCV. You can find this value in the manufacturer catalogue.
Remark: delta P is limited to the critical pressure drop
dP is not (80 - 3) psi, but about 80 * 0.5 psi
#3
Guest_sajid_*
Guest_sajid_*
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- guestGuests
Posted 11 September 2005 - 03:45 AM
QUOTE (aslan0 @ Sep 10 2005, 09:26 AM)
The flow will be slightly less than tha capacity of the pressure control valve.
First of all you need to know the flow coefficient (Cv or Kv-value) of the installed PCV. You can find this value in the manufacturer catalogue.
Remark: delta P is limited to the critical pressure drop
dP is not (80 - 3) psi, but about 80 * 0.5 psi
First of all you need to know the flow coefficient (Cv or Kv-value) of the installed PCV. You can find this value in the manufacturer catalogue.
Remark: delta P is limited to the critical pressure drop
dP is not (80 - 3) psi, but about 80 * 0.5 psi
How u decided the multiplication factor 0.5 ?
so if i have restriction orifice upstream at 80 bar and i want downstream at 10 bar , then do i need to use set of 2 orifices???
pl clarify.
sajid
#4
Guest_Rob Boback_*
Guest_Rob Boback_*
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- guestGuests
Posted 11 September 2005 - 07:15 PM
Yes how did you get the 0.5 psi value?
#5
Guest_Ana Carolina_*
Guest_Ana Carolina_*
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- guestGuests
Posted 20 January 2006 - 08:18 AM
Hey,
Do you know how to estimate the Cv of a PCV? It´s a empirical equation that uses the line diameter....
Tks
Do you know how to estimate the Cv of a PCV? It´s a empirical equation that uses the line diameter....
Tks
#6
proinwv
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Gold Member
Posted 20 January 2006 - 10:49 AM
You need to take into account the pressure loss in the pipe line, the valve pressure drop and the exit pressure as well as exit losses. These all are necessary to determine the flow. If you add an orifice, that also must be considered.
Also, these losses are not linear, but exponential.
My suggestion is to study Crane TP410, or a similar guide, or contact me thru my website, www.ostand.com
PAUL
Also, these losses are not linear, but exponential.
My suggestion is to study Crane TP410, or a similar guide, or contact me thru my website, www.ostand.com
PAUL
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