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My DIY skimmer...PIC INTENSIVE...

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bobn4burton View Drop Down
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    Posted: March 29 2005 at 1:20am
Hi all,

I decided to build me a skimmer.  This is the first skimmer I've ever built and even the first "real" skimmer I've owned.  I took my ideas from several sources (Euroreef, deltec, other DIY'ers, my own brainstorming).  I'll list some quick specs of the skimmer and then show a bunch of pictures of the whole build process (I'm showing a ton of pictures because I always like to see lots of peoples pictures...so if you don't want to see all the pictures then just scroll to the end )

Skimmer Specs:

Reaction body:  6" extruded acrylic tubing 18" tall
Pump:  Ocean Runner 2700 (2700=2500+needlewheel impeller)
Air intake:  DIY venturi on Recirculating pump
Riser tube:  2.75" riser tube about 3.5" tall
Skimmer total height:  25" tall

OK, now on to the pictures...

This first picture is one of all my supplies before getting started:


I decided that I wanted a slanted skimmer neck to transition from skimmer body to riser tube.  This should help with bubble travel from body to riser.  To do this I simply heat up a disc of acrylic in the kitchen oven and formed my reducer.

Here are two pieces of plywood I used to sandwich the acrylic while heating:


You can see the 5.75" holes I cut in the plywood for the forms.  This next picture shows the acrylic "sandwich" cooking in the oven:


I then used the tubing reserved for my riser tube to push the acrylic into my shape as seen below:


Here is a picture of the finished reducer after thermo-forming:


I then cut a hole in the thermo-formed reducer and glued my riser tube on:


I then started working on the body.  Here shows the holes in the body for pipe inlets/outlets:


And this pic shows the flange used to fasten the collection cup assembly to the body being glued to the body:


The next part that I worked on was the ventui.  It was quite simple really, just an airtube pushed tightly into a Tee with a hole cut in the airtube for air to be pulled into the water stream and into the pump.

Here are a couple pics of the venturi:




I then worked on the collection cup and keyholes to fasten the collection cup assembly to the body.  Here are a few pics of the process:





Now all the parts were about done.  I actually flipped the pump backwards from the way you'd normally see the deltec or ER recirculating skimmers.  This gave me better airflow into the body because the venturi inlet was a good 4-5 inches higher and so it had less backpressure on it.  Here is a pic of the mounted pump:


And finally here is a pic of the finished product:


And a couple shots when I was testing it in a tub of tankwater:



These two foaming pics were taken immediately into the testing.  After running it for two days straight the skimmer started to "break-in" a little and it was actually foaming about 3 times as good but I didn't get pics of it then

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 1:25am
Oh...and as an FYI...

If anyone was interested in seeing how the pump could be mounted "normally" here is a pic.  I can actually change it either way with how its setup in about 15 seconds.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ssilcox Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 2:20am

Pretty slick!

I especially like the "thermo-formed reducer". Great work.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote joliverson Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 8:03am

I'm interested in knowing the build cost.  I'd like to do something like this but think the cost wouldn't be much less than a ASM or deltec skimmer.

Jody

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfinch Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 8:55am

Awesome!  And I too like the thermoformed reducer.

Did you cut out the keyhole slots by hand?  With a dremel or router?

Are you getting a good seal using a full faced rubber gasket and 1/4" acrylic flanges?  I've had problems with that combination (the 1/4" acrylic flexes too much... 3/8 or 1/2" would work much better).  If you have problems look at using a large n-buna o-ring instead of the gasket.  I really like o-rings.

I want to build a recirculating skimmer too...

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfinch Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 8:56am
Oh almost forgot.  How hot did you heat up the acrylic to form the reducer?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 9:30am
Originally posted by joliverson joliverson wrote:

I'm interested in knowing the build cost.  I'd like to do something like this but think the cost wouldn't be much less than a ASM or deltec skimmer.

Jody

Cost really wasn't bad at all.  MUCH cheaper than buying one.  I spent about 35 dollars on all the acrylic and supplies relating to acrylic:  acrylic tubing and sheet, weld-on, applicator, etc.  I then spent 15 dollars on the Uniseals.  8 dollars on the telescoping 1 1/2" PVC fitting.  50 dollars on the Ocean Runner 2700 NW pump.  An probably about another 10-15 dollars in all the pvc fittings and misc stuff.

35 + 15 + 8 + 50 + 15 = $123

The skimmer I made compares to about the 800 dollar deltec.  Its hard to compare against a Euro-reef because they don't list a price for their recirculating skimmers that I've seen anyway.  Also hard to compare to ASM because they don't have a recirculating model that I'm away of.  But I'm sure you couldn't get a comparable skimmer for under 300.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 9:37am
Originally posted by jfinch jfinch wrote:

Awesome!  And I too like the thermoformed reducer.

Did you cut out the keyhole slots by hand?  With a dremel or router?

Are you getting a good seal using a full faced rubber gasket and 1/4" acrylic flanges?  I've had problems with that combination (the 1/4" acrylic flexes too much... 3/8 or 1/2" would work much better).  If you have problems look at using a large n-buna o-ring instead of the gasket.  I really like o-rings.

I want to build a recirculating skimmer too...

Yes, I cut the keyholes by hand with a dremel.  I just cut the larger hole and then drilled a smaller hole next to each larger hole.  I then took my dremel and made the smaller hole into a slot.

I actually don't get the best seal with the full faced gasket.  The gasket material is too hard.  It leaks enough to drip a couple times every few minutes.  Do you konw of a better o-ring I could use...and possibly where to get one?  I'm not sure what n-buna means.

As for heating the acrylic, I just put my 9" acrylic flat disc sandwiched between the two plywood forms as you can see in the pictures.  I then preheated my oven to 300 deg F.  Once my oven was preheated, I put the acylic sandwich in the oven for about 10-14 minutes and it was just plyable enough that I could use my riser tube to push down and form the reducer.  It worked very slick and easy.  MUCH easier than I thought it would and I'm very happy with the results.

I posted about this on RC, and got warned about possible flammable fumes escaping from heating the acrylic...so I guess there's a chance that heating the acrylic in your kitchen oven isn't 100% safe.  I obviously felt the risk was small enough to not worry about...but if anyone wants to try the kitchen oven method...just be warned.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bambbrose Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 10:13am
very nice work.  If I was to make a smaller version would it work the same?  I don't have a ton of space under my stand and I'm just curious how well a smaller version would work
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 10:33am
I don't see any reason why it wouldn't work making it smaller.  You could easily cut the skimmer body down from 18" high to 12" high.  The footprint could get a little smaller...but not too much because the pump is just so big and all of the tubing coming in and out takes up a lot of room.  You might be able to shrink it up with some creative placement of parts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fj40fax Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 10:43am
How much of it can be underwater?  I think I have about 20" of space, but about 15" of it is underwater in the sump.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 11:06am

You can submerse it up to the flange that connects the collectin cup assembly to the body.  only 20" of space is pretty tight.  I have about 26.5" inches of space and the skimmer is 25" tall.  So I don't have much room to spare.

But you could build a skimmer that was 6" shorter (cut the body down 6") and you could almost fit it in there.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfinch Quote  Post ReplyReply Direct Link To This Post Posted: March 29 2005 at 11:12am

 Do you konw of a better o-ring I could use...and possibly where to get one?

Search for 0-ring at www.dexonline.com for a local source.  I buy mine from HydraPak Seals on about 20th south and 37th west.  A 6.25 - 6.5 inch o-ring is about $0.50, but they have a minimum order of $5.  The thin sealing surface of the oring works great, even on 1/4" acrylic.

I'm not sure what n-buna means.

sorry... engineering habit.  n-buna is the material.  Just regular old black o-rings.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: June 02 2006 at 8:28am
Hi people.
 
Where can i find the photos form this topic?
 
It realy inspire me to make my DIY skimmer. I put this topic in my favorites a weeks ago, i now the pictures disapear...Confused
 
Could any one help me please.
 
Thanks in advance!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: June 02 2006 at 10:42am
The site I was using to host my files seems to be down.  I'm trying to find another cheap/free web hosting site....so I'll have them back up shortly.

Sorry!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: June 08 2006 at 1:41am
Pics should be back for now...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReefBones Quote  Post ReplyReply Direct Link To This Post Posted: June 08 2006 at 1:52am
No pics :( ... just a bunch of smilies ...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: June 08 2006 at 3:04am
Yep including in your avatar. Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bobn4burton Quote  Post ReplyReply Direct Link To This Post Posted: June 08 2006 at 3:07am
Hmmm...it was working at first.  Apparently the free hosting place I just signed up for doesn't like me linking to pics from a forum???  Well...I'll get this sorted out soon.

Nobody has a reccommendation for a good free web host do they?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: June 08 2006 at 3:09am
The best i know is http://www.imageshack.us/
 
No need to register, just upload images!Wink


Edited by Hugo RSF - June 08 2006 at 3:09am
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