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  #11  
Old 09-17-2011, 03:22 AM
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mitchgo mitchgo is offline
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Code is 5 fps.....Yeah well ef that!!! My code says it's 50 FPS!!!
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  #12  
Old 09-17-2011, 10:55 AM
Kiril Kiril is offline
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Quote:
Originally Posted by muddywater View Post
I got this flow meter offline recently. Pretty neat. On this particular meter, I had 49 gpm on a 5/8 meter and 120psi dynamic pressure(6 rotors running).
That flow meter is only rated to 30 GPM and connecting it on an elbow like that is not a good idea. I have serious doubts on the validity of that data.
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  #13  
Old 09-17-2011, 06:09 PM
muddywater muddywater is offline
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Quote:
Originally Posted by Kiril View Post
That flow meter is only rated to 30 GPM and connecting it on an elbow like that is not a good idea. I have serious doubts on the validity of that data.
Why is the elbow not a good idea? It seems if anything that would produce lower numbers? possibly more velocity?
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  #14  
Old 09-17-2011, 06:19 PM
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Wet_Boots Wet_Boots is online now
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Why not check the accuracy against the water meter?
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  #15  
Old 09-17-2011, 07:10 PM
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jvanvliet jvanvliet is offline
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Amazing you can operate @120 psi dynamic... what do you use to glue your fittings?
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  #16  
Old 09-18-2011, 08:38 AM
Kiril Kiril is offline
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Quote:
Originally Posted by muddywater View Post
Why is the elbow not a good idea? It seems if anything that would produce lower numbers? possibly more velocity?
Turbulence could interfere with the accuracy. Those types of meters are best used where you have fully developed flow (i.e. straight pipe of the same size). The typical minimum recommendation for this is 10 diameters upstream and 5 diameters downstream of any fittings or direction changes.
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  #17  
Old 09-18-2011, 11:36 AM
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1idejim 1idejim is online now
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Quote:
Originally Posted by Kiril View Post
Turbulence could interfere with the accuracy. Those types of meters are best used where you have fully developed flow (i.e. straight pipe of the same size). The typical minimum recommendation for this is 10 diameters upstream and 5 diameters downstream of any fittings or direction changes.
this is one of the reasons that you'll see cavatation in the hair strainer of an inproperly plumbed swimming pool, limited space for equipment forces some installers to resort to rapid directional changes breaking the 10 and 5 rule.
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