Canreef Aquatics Bulletin Board  

Go Back   Canreef Aquatics Bulletin Board > General > Reef

Reply
 
Thread Tools Display Modes
  #21  
Old 08-08-2009, 06:47 AM
Eb0la11 Eb0la11 is offline
Member
 
Join Date: May 2009
Location: Calgary, SE
Posts: 472
Eb0la11 is on a distinguished road
Default

Ya, sometimes I just want broader opinions and I know not everyone is reading my build thread. So more generic questions I sometimes post here. It all depends. I usually at least update in the build thread problems and solutions but sometimes the process is thought out in these separate threads.

The needle wheel is in my skimmer, yes. I have a separate pump that pumps water from my sump to my skimmer, through the needle wheel and then drains back into my sump. Its an out of sump model.
Reply With Quote
  #22  
Old 08-08-2009, 11:56 AM
banditpowdercoat's Avatar
banditpowdercoat banditpowdercoat is offline
Member
 
Join Date: Oct 2007
Location: 100 mile hse BC
Posts: 2,568
banditpowdercoat is on a distinguished road
Default

Quote:
Originally Posted by ALBERTA REEF View Post
I took a look at your thread build. I think your pump is too small for your plumming. My thinking your flow was bare mine from the outlet. By adding the check valve choked it some more. Try turning off three of your return feeds and see what happens.There is a head chart on Reef Central.

http://www.reefcentral.com/calc/hlc2.php
Adding outlets does nothing to increase head pressure. Neither does pipe size. A 6" diam pipe will have the same head pressure as a 1" pipe of same height.
__________________
Dan Pesonen


Umm, a tank or 5
Reply With Quote
  #23  
Old 08-08-2009, 05:35 PM
whatcaneyedo's Avatar
whatcaneyedo whatcaneyedo is offline
Member
 
Join Date: Apr 2007
Location: Prince George, BC
Posts: 2,198
whatcaneyedo is on a distinguished road
Send a message via MSN to whatcaneyedo
Default

Quote:
Originally Posted by banditpowdercoat View Post
Adding outlets does nothing to increase head pressure. Neither does pipe size. A 6" diam pipe will have the same head pressure as a 1" pipe of same height.
Thats quite the statement and contradicts everything I've seen and read. Do you have any sources to back it up?
__________________
"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft

Old 120gal Tank Journal
New 225gal Tank Journal
May 2010 TOTM
The 10th Annual Prince George Reef Tank Tour
Reply With Quote
  #24  
Old 08-08-2009, 06:17 PM
banditpowdercoat's Avatar
banditpowdercoat banditpowdercoat is offline
Member
 
Join Date: Oct 2007
Location: 100 mile hse BC
Posts: 2,568
banditpowdercoat is on a distinguished road
Default

Ya, Any plumbing manual. Head pressure is only the verticle height. It does not matter the diameter of the pipe. Now, when talking Flow restriction, that goes by pipe diameter, But if you have a 1" pump outlet, Doesnt matter if its 1" all the way up, or if it expands to a 6" pipe, the head pressure at the pump will be the same. GPM flow may be affected by the smaller pipe and friction loss, but not head pressure.


Think of it this way, Head pressure is in PSI, right? So, take a 1"x1" column of water 6' high. It has X head pressure. Now take a 6" pipe, Head pressure is still measured in PSI. Yes, the pipe is larger, but you only take a 1"x1" section of the pipe for figuring head pressure.


Or, take my fish tank, 150g, 5'x2'x2' Its 2' high, does not matter that the tank is 5' long, or 50' long, the pressure(PSI) at the bottom of the tank is the same, Its dependant on height, not LxW


Hope that helps
__________________
Dan Pesonen


Umm, a tank or 5
Reply With Quote
  #25  
Old 08-08-2009, 08:16 PM
whatcaneyedo's Avatar
whatcaneyedo whatcaneyedo is offline
Member
 
Join Date: Apr 2007
Location: Prince George, BC
Posts: 2,198
whatcaneyedo is on a distinguished road
Send a message via MSN to whatcaneyedo
Default

So your argument is simply that we were using the wrong terms, calling everything head pressure where as theres two different concepts: head pressure and flow restriction. Like the way everyone calls all sea slugs nudibranches... Never mind then.

I blame Delbeek and Sprung for mixing me up. "Head pressure refers not only to the vertical distance a pump must push the water, but also any resistance to flow created by pipes, fittings, and valves." The Reef Aquarium Vol 3
__________________
"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft

Old 120gal Tank Journal
New 225gal Tank Journal
May 2010 TOTM
The 10th Annual Prince George Reef Tank Tour

Last edited by whatcaneyedo; 08-08-2009 at 08:22 PM.
Reply With Quote
  #26  
Old 08-08-2009, 08:37 PM
mark's Avatar
mark mark is offline
Member
 
Join Date: Nov 2002
Location: Edmonton AB
Posts: 4,212
mark is on a distinguished road
Default

What we commonly referred to Head maybe more accurately is Dynamic Head, being the Static Head (the height part) plus friction (from couplings valves etc), and is for example what the RC Head Loss calculator, calculates.
__________________
my tank
Reply With Quote
  #27  
Old 08-08-2009, 08:39 PM
banditpowdercoat's Avatar
banditpowdercoat banditpowdercoat is offline
Member
 
Join Date: Oct 2007
Location: 100 mile hse BC
Posts: 2,568
banditpowdercoat is on a distinguished road
Default

But in the instance in this post, where you said to close off the other outlets, above the check valve, that would not have made a difference in the head pressure keeping the check valve closed.
__________________
Dan Pesonen


Umm, a tank or 5
Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT. The time now is 08:50 PM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.