Page 5 of 6 FirstFirst ... 23456 LastLast
Results 81 to 100 of 116

Thread: DIY RDF "2.0", The Beast

  1. #81
    Jaymeseywaymsey's Avatar
    Jaymeseywaymsey is online now
    Jaymeseywaymsey
    has specified a status ;)
    Senior Member ~~ Facebook Content Editor
    Join Date
    Jul 2013
    Location
    Southern Oregon
    Posts
    1,283
    Quote Originally Posted by Marlo View Post
    The difference is in the way they are cleaned. If you used a power washer on your sieve screen, I would expect that there would be very little build-up.
    Especially if it was cleaned from the underside upwards.


    Sent from my iPhone using Tapatalk

  2. #82
    Huysy's Avatar
    Huysy is offline
    Huysy
    has not specified a status.
    Member
    Join Date
    Feb 2017
    Location
    Baton Rouge, LA
    Posts
    39
    How would one know there was biofilm on the screen? Is it a brown film?

  3. #83
    tbullard is online now
    tbullard
    has not specified a status.
    Senior Member
    Join Date
    Sep 2010
    Location
    Augusta,GA
    Posts
    519
    Quote Originally Posted by kimini View Post
    On another thread here about a sieve, there were comments that using 100 micron screen won't work because the bio film will plug it up. I wonder why RDF users aren't having an issue with their 60-100 micro screen. Maybe because the surface area is larger and the chlorine in the spray water kills the bio film? Just guessing.
    They do clog but it takes much longer since they are constantly being cleaned with pressurized water. There have been several post recommending cleaning the screen with an acid wash as needed to remove the bio film.

    Quote Originally Posted by Huysy View Post
    How would one know there was biofilm on the screen? Is it a brown film?
    Yes, it is a brown film but also you will notice your RDF cleaning much more frequently since the film effectively reduces the micron size causing a cleaning cycle to be triggered more often. A nice side effect is that the more it clogs the better filtration you are getting.

  4. #84
    Huysy's Avatar
    Huysy is offline
    Huysy
    has not specified a status.
    Member
    Join Date
    Feb 2017
    Location
    Baton Rouge, LA
    Posts
    39
    Thank you for the explanation.

  5. #85
    Marlo is offline
    Marlo
    has not specified a status.
    Senior Member
    Join Date
    Sep 2015
    Location
    Long Beach
    Posts
    123
    Quote Originally Posted by tbullard View Post
    They do clog but it takes much longer since they are constantly being cleaned with pressurized water. There have been several post recommending cleaning the screen with an acid wash as needed to remove the bio film.



    Yes, it is a brown film but also you will notice your RDF cleaning much more frequently since the film effectively reduces the micron size causing a cleaning cycle to be triggered more often. A nice side effect is that the more it clogs the better filtration you are getting.
    Because the recommended cleaning treatment is muriatic acid, I always assumed that it was a mineral buildup rather than a biofilm buildup.
    63m3 gunite pool
    ProfiDrum CombiBio 50


  6. #86
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    Installed the drum to see how it fit - it does - now. It was put in bare because fully assembled it's too awkward to handle; one design goal was to be able to work on the unit without assistance. Once installed it became apparent that the rollers were too narrow; if the drum moved away from the front port slightly it would drop off all four rollers and getting it back on was a pain. The rollers will be widened so the drum stays on regardless where it is in the box. While another roller will keep the drum butted up against the front port, it won't always, like during filter screen changes when having it fall off the bottom rollers would be really inconvenient.

    Name:  IMG_20170315_171529.jpg
Views: 172
Size:  141.6 KB

    Name:  IMG_20170314_192217.jpg
Views: 171
Size:  62.1 KB


    This was the chance to test whether the hold-down screen could be installed in-place - it went in fine. The actual filter screen won't be installed until the unit is in-place. The tank was designed large enough so that the hold-down screen could be backed away from the drum far enough so that the filter element could be fed onto the drum in-place; this way the drum doesn't have to come back out.

    Name:  IMG_20170315_173329.jpg
Views: 170
Size:  104.4 KB

    Name:  IMG_20170315_174325.jpg
Views: 170
Size:  176.4 KB


    With the overhead lighting just right it was surprising to be able to see the distortion caused by welding heat. Half-inch material is substantial, but so is welding distortion!

    Name:  IMG_20170315_181917.jpg
Views: 174
Size:  70.5 KB


    In an emergency it can be converted to a washing machine...

    Name:  IMG_20170315_175130.jpg
Views: 173
Size:  73.0 KB
    Last edited by kimini; 1 Week Ago at 11:09 AM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  7. #87
    tbullard is online now
    tbullard
    has not specified a status.
    Senior Member
    Join Date
    Sep 2010
    Location
    Augusta,GA
    Posts
    519
    Would it be feasible to cut a "groove" into the roller that the drum would key into? This should help prevent the drum from running off the rollers.

  8. #88
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    I thought of it but the few times I've tried it in other applications, the roller either jammed or caused the thing riding on the rollers to climb up out of the groove. It may work fine but I'm too chicken to try it in this application.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  9. #89
    Huysy's Avatar
    Huysy is offline
    Huysy
    has not specified a status.
    Member
    Join Date
    Feb 2017
    Location
    Baton Rouge, LA
    Posts
    39
    What about increasing the height of your roller mounts 1/4" - 1/2" above your roller? This way there is a limitation on how far the drum will move away from the front. Only issue might be a clearance issue with your screen clamp.

  10. #90
    Primitive is offline
    Primitive
    Is trying to figure out how to convert 15000 gallon pool to koi pond
    Senior Member
    Join Date
    Mar 2016
    Location
    Southern California
    Posts
    154
    I know you used rollers, but you ever considered casters? You can notch out a middle channel on the wheel and it should fit the width of the drum ring. No movement and super strong.

  11. #91
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    Understood, but that's more complicated than just making the existing rollers wider, plus any castor assembly would have to be all-stainless and/or fabricated assemblies.
    Last edited by kimini; 1 Week Ago at 12:02 PM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  12. #92
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    Widened the drum rollers so now the drum can't fall off, though it can't with the thrust bearing in place but it was bugging me.

    Name:  IMG_20170319_150640.jpg
Views: 124
Size:  49.8 KB

    To plan the spray bar, a couple tests were run with the bar from the old RDF. With the nozzles 2" apart, the spray bar needs to be at least 3" above the drum for 100% coverage.

    Name:  IMG_20170319_151745.jpg
Views: 123
Size:  224.8 KB

    Next, the drum drive motor was mounted. The shaft is too short to align the sprockets when mounted to the outside of the enclosure. Either the motor has to be inset or it needs a shaft extension. I was concerned that the expected side loading would complicate it and also need a bearing at the far end, so a port was cut and an inset panel welded to the inside of the enclosure. The motor will eventually be enclosed in a Tupperware container to protect it from spray and rain.

    Name:  IMG_20170319_190400_716.jpg
Views: 123
Size:  132.6 KB

    The chain was added and the motor temporarily run off a car battery to see how it worked. It was a reminder that a chain tensioner isn't optional because the chain is always too loose or too tight. Running it now was also a chance to see how long half a rotation takes, which was 12 seconds. The battery may have been weak because the math said it should have been 10 seconds, but the variation's not a big deal.

    Name:  IMG_20170319_182910.jpg
Views: 126
Size:  93.2 KB
    Last edited by kimini; 1 Week Ago at 12:23 PM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  13. #93
    Primitive is offline
    Primitive
    Is trying to figure out how to convert 15000 gallon pool to koi pond
    Senior Member
    Join Date
    Mar 2016
    Location
    Southern California
    Posts
    154
    If you had to build this rdf for a pump fed application, how would you approach the water level detection issue? I'm looking for a way to get a proper water level probe to work for my design idea.

  14. #94
    tbullard is online now
    tbullard
    has not specified a status.
    Senior Member
    Join Date
    Sep 2010
    Location
    Augusta,GA
    Posts
    519
    Quote Originally Posted by Primitive View Post
    If you had to build this rdf for a pump fed application, how would you approach the water level detection issue? I'm looking for a way to get a proper water level probe to work for my design idea.
    On a pump fed Rdf the level sensor goes on the dirty water side and it detects when the water level rises to certain height. The rise is caused by the screen clogging and restricting water flow.

  15. #95
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    I've been thinking about the float switch in my gravity-fed situation and I think this idea could work for you as well:

    Have a float on both sides of the drum (inlet and outlet) connected to a "teeter-totter" sort of thing with a tilt switch on it. That way if the water level in the pond changes - which it always will do - both the inlet and outlet levels rise or drop the same yet wouldn't cause false cleaning requests. As far as the rest of the assembly goes it would probably require a full enclosure with a watertight cover. I'd be concerned about how much pressure is being applied though since that pressure is applied over every square inch.

    Lets say for example the RDF is working fine and has only 0.1 psi difference across the screen - that's pretty much nothing. But let's say in a pressurized setup, water pressure is being pumped into the RDF with oh, 2 psi head because the outlet goes up 4-5 feet. That's 2 psi across ever single panel. Let's say that the entire housing is 36" wide and 24" tall, so that means that one panel alone has 1728 lbs of force pushing on it. Whatever it's made of will need to be really robust.
    Last edited by kimini; 1 Week Ago at 05:54 PM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  16. #96
    Primitive is offline
    Primitive
    Is trying to figure out how to convert 15000 gallon pool to koi pond
    Senior Member
    Join Date
    Mar 2016
    Location
    Southern California
    Posts
    154
    Any update on rdf? How much more was done?

  17. #97
    JGS107 is offline
    JGS107
    Carpe Diem
    Senior Member
    Join Date
    Feb 2013
    Location
    Holly Springs,NC
    Posts
    369
    Do you have a part number for that gear and chain for the drive motor

  18. #98
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    The chain, like many of the parts, is from McMaster.com, 6846K4

    Regarding the gear, I had it custom made. I used this motor: http://www.makermotor.com/brush_gearmotor.html. In hindsight, the cost of the motor, chain, and gear ended up being enough that a direct-drive gear motor (meaning that it drives the drum axle directly with no need for a chain or gear) could have been used. Note that Makermotor makes a lot of different motors which could be used, both 12VDC and 115VAC.Something like this maybe, http://www.makermotor.com/Rotisserie_motor.html
    Last edited by kimini; 2 Days Ago at 09:28 AM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  19. #99
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    This weekend's progress:

    Spaced the drive sprocket up another 0.25" away from the drum for better motor/drum alignment:

    Name:  IMG_20170326_133410.jpg
Views: 62
Size:  78.3 KB

    Drum seal, Mcmaster #2614T38, held in-position by a fiberglass strip. I may add more screws to keep the rubber from being able to slide out sideways in between the existing screws.

    Name:  IMG_20170326_140903.jpg
Views: 62
Size:  78.6 KB

    The seal only needs to extend higher than the maximum incoming water level.

    Name:  IMG_20170326_133314.jpg
Views: 62
Size:  58.9 KB

    Front outset panel provides clearance for the water pipes so they don't interfere when installing or removing the drum. The partial panel is for observation of drum operation and maintenance. The upper portion will be removable and also serves as the mount for the 48" drain pipe assembly.

    Name:  IMG_20170326_140132.jpg
Views: 62
Size:  93.0 KB

    Figuring out placement and orientation of the slide valves, done now to determine port locations for the two 4" BD and 3" skimmer inlets.

    Name:  IMG_20170326_153718.jpg
Views: 64
Size:  143.4 KB

    Close-up of above. The thinking is (was) that the BD water enters from below, with the first Tee feeding a 3" drain to waste so that the BDs can be purged (and partial water changes) by opening the valve momentarily. The upper Tee (which will be changed to a street sweep) feeds the water to both the RDF and to a standpipe. The standpipe is so that a chimney cleaner element can be fed in to clear the BD pipes.

    I changed my mind later, relocating the 4" valves to be at the bottom right on the inlet pipes. That way, if the 3" purge valve fails open, the flow can be shut off without draining the pond!

    Name:  IMG_20170326_153718.jpg
Views: 64
Size:  143.4 KB
    Last edited by kimini; 2 Days Ago at 04:50 PM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

  20. #100
    kimini is online now
    kimini
    has not specified a status.
    Senior Member
    Join Date
    Oct 2007
    Location
    SoCal
    Posts
    378
    Looking at that last picture, I see an issue with the 2" drain valve because it's connecting to a threaded bulkhead port. If it has to be unscrewed, it'll be blocked by the 3" skimmer valve above it - all the others don't have that issue since they use Uniseals. Good to stare at stuff and try to catch this sort of thing early-on!

    I also realized that at some point soon it needs to be leak-checked, probably before the ports are cut.
    Last edited by kimini; 2 Days Ago at 05:16 PM.
    Build a sports car from scratch! Check out midlana.com and kimini.com

Page 5 of 6 FirstFirst ... 23456 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •