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Carlsson
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Topic: Jebao DC 12000 intake screen for $1 Posted: August 16 2014 at 10:26pm |
I have made a inexpensive screen for my new Jebao DC 12000 using a 1.5" PVC schedule 40 adapter with female thread ($ 0.98 at Lowes). I have cut off apx 0.5" from the non-threaded end of the adapter to make it shorter and drilled many small holes around the entire circumference. Then I used a fishing line to create a net inside (kind of like stringing a tennis raquet) and secured the fishing line to the adapter using superglue. Works well to keep snails from being chopped up by the propeller and protects your pump from being destroyed by a random piece of PVC or zip tie...
Edited by Carlsson - August 16 2014 at 10:28pm
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Fatman
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Posted: August 16 2014 at 10:46pm |
Nice job!
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Mike Savage
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Posted: August 16 2014 at 10:49pm |
Very nice!
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Reefer4Ever
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Posted: August 17 2014 at 6:04am |
That's ingenuity at its best. Fantastic job.
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90 gal reef w/refugium 24 gal softie tank 11 gal nano anemone tank 5 gal fresh water
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Mark Peterson
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Posted: August 17 2014 at 9:33am |
That's a lot of fine detail work. Very nice looking yet not a practical solution. Sorry but I'm sure you wouldn't want discover later how the tank suffered because the screen clogged and wasn't noticed until issues started to develop. It's about the physics of water flow. It will easily clog because of the ratio of small surface area to
suction. If the size of the screen is enlarged the intake suction
diffuses proportionally at all points. Here is a great alternative. Have you ever seen how Needlepoint Plastic Canvas can be sewn together with fishing line to make a larger cylindrical screen that practically never clogs? I would be happy to show examples if you are interested. Aloha
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badfinger
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Posted: August 17 2014 at 1:45pm |
Didnt your jebao come with a screen?
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Carlsson
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Posted: August 17 2014 at 8:37pm |
Jebao DC 12000 does not come with an intake screen (only DC 6000) does. The picture bellow explains why this is not only practical solution, but probably one of very few that would work in my sump. There is a very limited amount of space between the intake and the sump wall. This is dictated by my sump's width, length of the pump, and existing plumbing. I can also see directly into the intake, so any possible clogging would be quite obvious. I just can't imagine what would clog this screen as the "holes" are fairly large (maybe a fistfull of astrea snails ). I am not a big fan of needlepoint canvas for this application. It comes in 3 varieties: 7, 10, and 14 holes per linear inch. In all cases the holes are much smaller than needed for a screen (not a filter) and thus would be prone to clogging. The "holes" actually make up only about 25% of the surface area of the 10-count and 35% of the 7-count canvas. So, to achieve the same open surface area as in the nylon net screen, you'd have to make a cylinder apx. 1.5" long. Not to mention that all the plastic "bars" in the canvas would create area of very low pressure behind them and disrupt the laminar flow of water into the intake. To avoid decreasing the pump's performance, the cylinder would have to be even longer. Amazon has a screen with 1.5" female thread made by Cal Pump for about $13, but that thing is close to 4" long . Not enough space in my sump for that.
Edited by Carlsson - August 17 2014 at 8:38pm
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Reefer4Ever
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Posted: August 17 2014 at 8:42pm |
Well that just about sums that up I still think your ingenuity is amazing and there is something pretty great to be said about doing a job yourself. Bravo sir!
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90 gal reef w/refugium 24 gal softie tank 11 gal nano anemone tank 5 gal fresh water
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badfinger
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Posted: August 17 2014 at 9:42pm |
Oh I have the 6000 so that explains it.
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keithro
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Posted: August 27 2014 at 2:43pm |
Both of my Jebao DC12000's came with an intake screen.
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Aquarium Creations
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Posted: August 27 2014 at 8:14pm |
interesting, All the dc 12000 i have used come with a screen, just installed one last week.
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Carlsson
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Posted: August 31 2014 at 11:10pm |
I have bought mine (new) from a club member but fish-stret.com is advertising the intake cover only with DC 6000. I guess these things can be variable which is to be expected when you buy knock-off product from a less-then-reputable manufacturer. Overall, my experience with the DC 12000 is mixed. While I like the high output and soft-start, my pump is not nearly as silent as I had expected. There is this annoying whinning noise that is most noticeable during the startup. It subsides a little bit when the pump is at speed, but is still (quite) audible. It is definitely much louder than my old Eheim 1262. I have redone my plumbing to decrease the flow resistance and while it probably helped a little, it did not solve the noise issue. I have been running the pump for about a month, so it should be "broken in" by now. I guess I just had bad luck with this particular pump.
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Mark Peterson
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Posted: September 01 2014 at 7:51am |
What is the distance from the outer end of the PVC fitting to the glass? It looks like only about 1/2". This is important because flow resistance may be causing pump cavitation noise. An easy way to check this would be to remove the DIY screen PVC fitting, thus opening the port to a larger intake area. If this simple test makes the pump run quieter, a large "basket screen" would be my suggestion. If it were me, I would still swap out the PVC fitting for the benefits of a basket screen, which I describe below. I completely understand what has been said regarding Needlepoint Plastic Canvas mesh size/wire size making usable flow through only about 35% of total surface area. Read on and see how this works. Using flexible screen material like Plastic Canvas and fishing line, I would take a piece 16"L x 3-4"W and make a ~5"D by ~3-4"L short cylinder. I would sew 5"D round pieces of screen material flat on both ends. A side view would look something like this without the gaps [] A hole would be cut in one flat end just large enough to snugly fit over the threads of the pump intake port. This hole would be off of center since the threaded intake is only about 1-2" from the bottom of the tank. Because it would be made of flexible screen material, this short cylinder could slide down snugly against the glass, positioning the hole on the back side directly across from the intake port then pushed back over the intake port threads. The "basket screen" would provide easy flow of water through to the intake port. Here are the calculations: 5" diameter cylinder plus the back screen (5"D x 3.14 x 3"L = 47 square inches (front of screen is only for support of the cylinder shape, since it sits close to the glass)). Subtract roughly 2" of area occupied by the pump intake port and we have 45". Now multiply 45" by 35%, the usable flow through Needlepoint as stated in a previous post. That's 16" of space for water to flow through. Compare 16" with only 2" of water flow through the PVC screen (3.14 x .75" x .75"). I hope this makes sense. The concept is to make the basket screen so large and so far away from the pump intake that water flows through it slow and easy. This is because the suction pressure at the screen holes is far less than at the intake port. Debris may gently sit next to the screen but is not easily sucked up against the screen to clog it. I have done this many times. I know how well it works. The basket screen pictured below worked undisturbed for 8 months with Caulerpa growing all around it before cleaning was eventually required. Aloha
Edited by Mark Peterson - September 01 2014 at 8:03am
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Nick801
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Posted: September 01 2014 at 3:19pm |
Aquarium Creations wrote:
interesting, All the dc 12000 i have used come with a screen, just installed one last week. |
Eric the one I got from you didn't have one on it I just picked up a nice pump filter at at sprinkler world It was like 6 bucks or something Speaking of DC 12000's does anyone have an extra they would like to sell? Eric do you have anymore?
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