Home | About Us | Contact Us


Koi Forum - Koi-Bito Magazine straight from Japan
Results 1 to 6 of 6

Thread: Volume of water lost

  1. #1
    Tosai
    Join Date
    Jan 2012
    Posts
    28

    Volume of water lost

    Hi there All.

    Can any one give me an approximation of what the effect is of 90deg bends in your plumbing on the amount of water that comes out of the pipe in a low pressure application (i.e. running a submersible pump with 40mm PVC piping with around 9 90deg bends in order to get the water where it is supposed to go) and would there be any benefit to reducing the number of bends used?

    Thanks in advance
    H

  2. #2
    Tosai
    Join Date
    Jan 2012
    Posts
    28
    BTW, I ask this because I had read somewhere that bends (as well as friction from the inside of the pipe and the length of the pipe) in the plumbing will have a negative effect on the amount of water moved as well as velocity? I tried to Google it again but I got a headache from the University level mumbo jumbo that I found....

  3. #3
    MCA
    MCA is offline
    Honmei MCA's Avatar
    Join Date
    Dec 2003
    Location
    Atlanta
    Posts
    2,574

  4. #4
    Tosai
    Join Date
    Jan 2012
    Posts
    28
    Thanks for the link MCA, I had a look, apparently a sharp 90 deg bend on a 40mm pipe has a value of 7.5, the highest of them all. Which in itself can not be good, especially taking into account that for every bend there is also two male / female adapters to allow the pipe to connect to the bend, so then we can add a further 3.5, taking us up to 11.

    Now, forgive my ignorance, but what does that mean? I am thinking that I will definitely see benefit if I reduce the number of bends and adapters in the plumbing by half? (from 8 to 4 bends and 16 to 8 adapters)



    Thanks again for the feedback.

    H

  5. #5
    MCA
    MCA is offline
    Honmei MCA's Avatar
    Join Date
    Dec 2003
    Location
    Atlanta
    Posts
    2,574
    Not sure what you mean about needing adapters. On the PVC pipe I use, the pipe glues directly into both ends of the fitting. You use a primer on the end of the pipe and the fitting to clean it. Then you apply glue to the end of the pipe and fitting. Then quickly insert the pipe into the fitting and give the pipe a quarter turn. Hold the pipe firmly into the fitting for a few seconds as the reaction of the glue (a solvent) is melting the pipe and fitting together...and that can tend to push them apart a fraction of a mm.

    One way to reduct the number of fittings...use flexible PVC pipe instead of rigid pipe. The flexible pipe I use is cut and glued the same as rigid PVC pipe. Note that the flexible pipe is more expensive.
    Koi keeping is not a belief system; it is applied science with a touch of artistry.

  6. #6
    Tosai
    Join Date
    Jan 2012
    Posts
    28
    Hi there, thanks for the reply.

    I should have mentioned that the pipe that we get in 40mm here in RSA is the same pipe used for irrigation (1mm thickness, black in colour) hence the need for adapters that glue with PVC solvent into the elbows.

    Anyway, I removed half of these elbows and adapters and, YES, it makes a huge difference, didn't measure flow before and after, but the visual difference is MASSIVE.

    So, I am happy that I did, more flow!

    H

Similar Threads

  1. Nishikigoi Yearbook Volume II
    By MCA in forum Main Forum
    Replies: 0
    Last Post: 05-22-, 06:32 PM
  2. Nishikigoi Yearbook Volume II
    By MCA in forum Main Forum
    Replies: 1
    Last Post: 05-04-, 12:49 PM
  3. Volume-Depth-% Water Change-Filtration-
    By kntry in forum Main Forum
    Replies: 27
    Last Post: 09-11-2013, 03:55 AM
  4. Momotaro: Volume Production
    By MikeM in forum Main Forum
    Replies: 8
    Last Post: 06-24-2013, 05:15 PM
  5. Volume of Water Per Koi Revisitation
    By Lam Nguyen in forum Main Forum
    Replies: 34
    Last Post: 10-02-2008, 12:35 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Articles - Sitemap - FAQs and Rules

KB Footer Graphic
Straight from Japan... For the serious hobbyist!
All content and images copyright of: Koi-bito.com