question about tube lenths

NeoReaper · 06-22-2003, 12:57 AM

what r the advantages of shortening your tube lengths?

MadDogMe · 06-22-2003, 04:43 AM

Reduction in loss of head/pressure caused by friction of the tube walls...

Someone posted a chart or some figures of headloss for 1/2 tubing on a Ehiem1250 IIRC and the results were frightening!. A few feet of tube can realy knock your head off!

...

PS, it was a thread about 'best pumps' or 'pump p~curves' I think. I'll post a link if I can find it...

MadDogMe · 06-22-2003, 04:50 AM

http://w3.one.net/~robotech/images/W...pump_press.jpg

That was it but it's not hosted anymore :shrug: . It was originaly posted by Robotech. Maybe PM him and see if he still has the charts somewhere (semi naked babes and all!!

)...

bigben2k · 06-22-2003, 09:11 AM

True, but it does depend on the tubing diameter, and actual flow rate.

Using 1/2" tubing, you can achieve minimal flow restriction where one looses:
0.09" of head, per foot of tubing @ 0.5 gpm
0.34" of head, per foot of tubing @ 1.0 gpm
0.72" of head, per foot of tubing @ 1.5 gpm
1.23" of head, per foot of tubing @ 2.0 gpm

(Calculated using Hazen-Williams formulae, Darcy's would be more accurate)

NeoReaper · 06-22-2003, 09:59 PM

well im using a eheim 1250 pump with 1/2 inch tygon tubing. currently im using 10feet of tubing total cuz i decided to try to keep my raidator farther away from my computer since my 120mm fans seem to cause vibration (even with 7volt mod) on my case which was kinda annoying.

06-22-2003, 12:57 AM	#1
NeoReaper Cooling Neophyte Join Date: May 2003 Location: USA Posts: 30	question about tube lenths what r the advantages of shortening your tube lengths?

06-22-2003, 09:11 AM	#4
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	True, but it does depend on the tubing diameter, and actual flow rate. Using 1/2" tubing, you can achieve minimal flow restriction where one looses: 0.09" of head, per foot of tubing @ 0.5 gpm 0.34" of head, per foot of tubing @ 1.0 gpm 0.72" of head, per foot of tubing @ 1.5 gpm 1.23" of head, per foot of tubing @ 2.0 gpm (Calculated using Hazen-Williams formulae, Darcy's would be more accurate) __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

06-22-2003, 04:43 AM	#2
MadDogMe Thermophile Join Date: Aug 2002 Location: Just shut up ;) ... Posts: 1,068	Reduction in loss of head/pressure caused by friction of the tube walls... Someone posted a chart or some figures of headloss for 1/2 tubing on a Ehiem1250 IIRC and the results were frightening!. A few feet of tube can realy knock your head off! ... PS, it was a thread about 'best pumps' or 'pump p~curves' I think. I'll post a link if I can find it...

06-22-2003, 04:50 AM	#3
MadDogMe Thermophile Join Date: Aug 2002 Location: Just shut up ;) ... Posts: 1,068	http://w3.one.net/~robotech/images/W...pump_press.jpg That was it but it's not hosted anymore :shrug: . It was originaly posted by Robotech. Maybe PM him and see if he still has the charts somewhere (semi naked babes and all!! )...

06-22-2003, 09:59 PM	#5
NeoReaper Cooling Neophyte Join Date: May 2003 Location: USA Posts: 30	well im using a eheim 1250 pump with 1/2 inch tygon tubing. currently im using 10feet of tubing total cuz i decided to try to keep my raidator farther away from my computer since my 120mm fans seem to cause vibration (even with 7volt mod) on my case which was kinda annoying.

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