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  • Results 1 to 9 of 9

    Thread: flow distance

    1. #1
      bobbd's Avatar
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      flow distance

      Is 60 ft. To far to run a gravity fed bottom drain line to an rdf or is shorter better as far as line clogging and flow ?

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    2. #2
      ricshaw is offline Senior Member
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      If you decide to do it I would install one of these half way with a stand pipe.

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    3. #3
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      For flow, the closer the better.

      Still learning as I go but y'all can call me Marilyn

    4. #4
      batman is offline Senior Member
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      For gravity flow shorter is always an advantage for flow and clogging concerns. You also need to add in the resistance of all pipe fittings on the 60 feet of pipe. 60 feet of pipe plus fittings resistance can easily turn into 90 feet equivalent length. A 4 inch pipe 90 feet long can flow 4,000 gph with 3 inch drawdown in the filter. This will be in addition to the RDF normal drawdown due to screen resistance.
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      joe09 is offline Senior Member
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      Quote Originally Posted by batman View Post
      For gravity flow shorter is always an advantage for flow and clogging concerns. You also need to add in the resistance of all pipe fittings on the 60 feet of pipe. 60 feet of pipe plus fittings resistance can easily turn into 90 feet equivalent length. A 4 inch pipe 90 feet long can flow 4,000 gph with 3 inch drawdown in the filter. This will be in addition to the RDF normal drawdown due to screen resistance.
      i have 4 in pipe gravity feed from bottom drains to settle chamber.i have 3 -4in pipes feeding the settle chamber/filter, 2 in pipe to 7600 gal pump.works great

    6. #6
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      Quote Originally Posted by joe09 View Post
      i have 4 in pipe gravity feed from bottom drains to settle chamber.i have 3 -4in pipes feeding the settle chamber/filter, 2 in pipe to 7600 gal pump.works great
      I can see that working well in a settlement chamber situation.
      An rdf is unique as that amount of resistance would likely generate so many cleaning cycles as to compromise the stability of the system overall.

      Still learning as I go but y'all can call me Marilyn

    7. #7
      MCAsan is offline Senior Member
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      If flow rate is high enough to RDF and you occasionally purge it....not need for the pipe to clog. But if the flow rate is slow, you can indeed create a settling chamber.

    8. #8
      avorancher is offline Senior Member
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      Depends on your flow rate (draw down at RDF). I have two 4" BD lines running to an RDF and one 4" skimmer line. The skimmer line is 70 feet from the filter, one BD is 60 feet and the other 50 feet from the filter. Each line is heat-bent until just before the filter where each has two 90 degree angle fittings.

      They have been running for over 10 years with no problem. Last January when I installed the RDF, I had to cut each of the lines to adapt them to the new filter setup and was surprised that each pipe was relatively clean inside with no carpet algae like on the pond walls. As a guess, I flow around 3500 to 4000 gph through each line.

    9. #9
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      Avorancher how hard was it to heat bend 4 inch pvc ? im using schedule 80.

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