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07-11-2010, 01:26 PM
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#1
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2 Rivet Member
1966 22' Safari
Hinsdale
, New Hampshire
Join Date: Jul 2008
Posts: 27
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How do you attach the fitting to the black tank?
I bought a new black tank last year without the fittings attached since I didn't know exactly where they should be placed. I changed the size of the black tank and also bought a new toilet so the new hole is in a different spot than the old one. I planed on cutting a hole and using ABS cement to attach it and I also bought a 3 1/8 hole saw from BAHCO. This was based on the recommended size listed in one of my RV catalogs. Now that I'm ready to cut the hole for the fitting, (to hold the flange) I realize the hole saw's diameter is less than the diameter of the fitting. Did I buy the wrong size or is there some trick to attaching this? If someone could let me know how to accomplish this task I might have this thing on the road in three weeks. (fingers crossed) Thanks
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07-11-2010, 03:21 PM
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#2
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Rivet Master
2002 25' Safari
1977 20' Argosy 20
northern valley
, new jersey
Join Date: Nov 2008
Posts: 532
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pipe size
"nominal pipe size" is not the actual "outer diameter" or "OD" of a pipe, it's generally close to, though not necessarily exactly the sames as the "inner diameter" or "ID" of the pipe.
thus the actual OD of a piece of pipe can be very different than its nominal size; fittings are even bigger....
page 24 of this manual ( http://www.charlottepipe.com/Documen...ech_Manual.pdf ) has the OD of a 3" ABS Schedule 40 DWV pipe at 3.5", but I'd strongly recommend consulting the manufacturer of the pipe or fitting that you're using, or a good set of calipers to measure it before you buy a new holesaw, much less drill that hole!
be patient! be careful! good luck!
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07-11-2010, 04:07 PM
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#3
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Iwannagocamping
1979 31' Sovereign
Rineyville
, Kentucky
Join Date: Apr 2009
Posts: 262
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I was under the impression that those fittings were "spin welded"..
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07-11-2010, 04:11 PM
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#4
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Rivet Master
1976 25' Caravanner
Vintage Kin Owner
Campton
, New Hampshire
Join Date: Feb 2006
Posts: 1,113
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Before you cut any holes you might want to find a plastics shop . Usually those fittings are spun welded into the tank. Not sure what you have for fittings perhaps they are something different , you didn't say .
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07-11-2010, 05:24 PM
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#5
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Rivet Master
1968 24' Tradewind
Oxford,
, Mississippi
Join Date: May 2009
Posts: 1,564
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I'm assuming you put the new black tank into position under the trailer and then marked the top through the hole in the floor. I installed a new tank in my Trade Wind. At first I just measured the old one and marked the new tank because it was the same. After thinking about it, I decided to mount the tank in the galvanized box and raise it into position under the trailer. Glad I did, because I would have made a big mistake as the hole would have been nearly 2 inches off. My new tank is fiberglass so I just glassed the flange supplied with the tank into position after cutting the hole. Can't give advise as to how to attach stuff to your tank, but having it in the exact right position is job one.
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07-11-2010, 05:42 PM
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#6
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Rivet Master
1977 27' Overlander
1973 27' Overlander
1963 19' Globetrotter
Naples
, Florida
Join Date: Nov 2007
Posts: 1,259
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Trying to remember how I did mine, seems like on the fitting was a small lip that went inside tank,if so you just need a hole saw that size and glue it in.If not the 31/8 will work fine,remember the fitting has a stop in it,so you should be good. Dave
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07-11-2010, 05:46 PM
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#7
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2 Rivet Member
1966 22' Safari
Hinsdale
, New Hampshire
Join Date: Jul 2008
Posts: 27
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New plan
After reading the responses to my query, I am going to first call the company I bought this tank from to see what they say. Then I'm going to find someone to cut the hole and place the flange in correctly. Thanks for your help.
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07-12-2010, 09:06 AM
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#8
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3 Rivet Member
Columbia
, South Carolina
Join Date: May 2009
Posts: 173
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Mark the OD of the flange over the existing hole and enlarge it with a jigsaw or a dremel tool. If you have a black plastic ABS tank, use ABS glue or ABS shavings mixed with acetone to form a solvent paste (that will also patch a hole).
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07-12-2010, 10:18 AM
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#9
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Rivet Master
1977 Argosy 24
Currently Looking...
Milltown
, Wisconsin
Join Date: Mar 2006
Posts: 1,087
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Black ABS fittings glue to Black ABS tanks and pipe. Like it was said above, acetone and ABS shavings is what the glue is made of. Cut the hole the same size as the hole in the fitting, unless the fitting has a lip on it to center it in the hole.
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07-12-2010, 12:34 PM
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#10
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banjobill
2000 30' Limited
battle ground,
, Washington
Join Date: Jun 2009
Posts: 516
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abs spin welding?
okay you guys, what the heck is this procedure?
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07-12-2010, 01:07 PM
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#11
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Wise Elder
2010 30' Classic
Vintage Kin Owner
South of the river
, Minnesota
Join Date: Dec 2009
Posts: 4,169
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Spin welding - Wikipedia, the free encyclopedia
ABS is easy to cement and you can get ABS cement in any hardware store or home center. That's what I would do.
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