Calculation help needed...please

XabbaRus · 09-01-08, 10:35 AM

Hi guys

I have a little problem.

I have to sort out the design for a pipe riser. Thing is I can't start to figure out what size of pipes I need until I know what sort of flow I want to maintain.

Now I know the inlet pressure into my system....2 bar. The first run of pipe is 3/4" which then branches off to 1/2"

I also know the distances that the pipes have to go. Basically how do I know what flow rate I'm going to get out of a tap given that the inlet pressure is 2 bar, I know the size of the internal pipes and the distance from the inlet to the tap.

All I need is the formula then I can go and get the flow rate. Then I can go and design my riser.

Cheers

Digital_Trucker · 09-01-08, 11:38 AM

See if this is helpful

http://www.pipeflowcalculations.com/

It's been far too long since I studied anything like that to tell if any of those calculators will do you any good.

VipertheSniper · 09-01-08, 11:50 AM

I wouldn't know how to calculate that, but I'm sure there are figures available for the respective pipes, but probably this might give you a lead how you could figure out how much will be flowing through the pipes in a minute, take a bucket, fill it with water, take two straight pieces of uneven length and two knees screw'em together in an U shape, place bucket on table, dip shorter end of U into the bucket, get a bucket (maybe with markings for volume on the inside) under the longer end of the U, suck on the longer end of the pipe until the water flows, stop the time it takes to get a gallon or litre through, divide 60 with measured time, multiply result with amount of water. tada flow rate with 1 bar...

I hope that helps.

09-01-08, 10:35 AM	#1
XabbaRus Navy Seal Join Date: Sep 2001 Posts: 5,330 Downloads: 5 Uploads: 0	Calculation help needed...please Hi guys I have a little problem. I have to sort out the design for a pipe riser. Thing is I can't start to figure out what size of pipes I need until I know what sort of flow I want to maintain. Now I know the inlet pressure into my system....2 bar. The first run of pipe is 3/4" which then branches off to 1/2" I also know the distances that the pipes have to go. Basically how do I know what flow rate I'm going to get out of a tap given that the inlet pressure is 2 bar, I know the size of the internal pipes and the distance from the inlet to the tap. All I need is the formula then I can go and get the flow rate. Then I can go and design my riser. Cheers __________________

09-01-08, 11:38 AM	#2
Digital_Trucker Silent Hunter Join Date: Jul 2007 Location: The Peach State Posts: 4,171 Downloads: 141 Uploads: 10	See if this is helpful http://www.pipeflowcalculations.com/ It's been far too long since I studied anything like that to tell if any of those calculators will do you any good. __________________ RSM-GIEP-Killflags-LV Tribute-Playable Elco __Peace be with you, Dave.

09-01-08, 11:50 AM	#3
VipertheSniper Ace of the Deep Join Date: Sep 2002 Location: Austria Posts: 1,070 Downloads: 0 Uploads: 0	I wouldn't know how to calculate that, but I'm sure there are figures available for the respective pipes, but probably this might give you a lead how you could figure out how much will be flowing through the pipes in a minute, take a bucket, fill it with water, take two straight pieces of uneven length and two knees screw'em together in an U shape, place bucket on table, dip shorter end of U into the bucket, get a bucket (maybe with markings for volume on the inside) under the longer end of the U, suck on the longer end of the pipe until the water flows, stop the time it takes to get a gallon or litre through, divide 60 with measured time, multiply result with amount of water. tada flow rate with 1 bar... I hope that helps.