| Author |
Message |
Chuck Lott (67.33.174.222)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 01, 2004 - 4:43 pm: | |
I'd like to add another 3" outlet in my new 105 gal waste tank.(Its the standard RV plastic tank)
Besides the plastic welder, Anyone successfully added one that did not leak? If so, would you share the technique? Thanks a lot |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 01, 2004 - 6:11 pm: | |
Hi Chuck,
The best way (my personal opinion) is to find a shop that can spin weld one on for you. Many RV places have the tools and skills.
Though there are other ways, the spin-weld method is reliable and foolproof when *properly* done, and you sure don't want to take a chance of having 110 gallons of poo blow out at you when you least expect it!! |
Airless in Mississippi (69.92.6.98)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 01, 2004 - 9:27 pm: | |
The big question is then FINDING a shop that will spend weld onto a soiled tank.... |
Airless in Mississippi (69.92.6.98)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 01, 2004 - 9:27 pm: | |
Spin |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 01, 2004 - 10:44 pm: | |
>> The big question is then FINDING a shop that will spend weld onto a soiled tank....>>
Um, Chuck did say "new".... |
Airless in Mississippi (69.92.6.98)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, July 01, 2004 - 11:18 pm: | |
oops sorry blind... Thanks for the correction.
SPIN WELDING IS THE WAY TO GO>>. |
califbob (209.86.8.63)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 02, 2004 - 12:44 am: | |
Well this how I did it. Buy a 3" out let with a 4 bolt flange. Availble at RV supply store. Cut a hole in your tank using industial type "molly bolts" after using good silacon sealer bolt it on. Mine has lasted about 15 years |
Dale MC8 (69.19.173.122)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 02, 2004 - 1:07 am: | |
Yeah, what he said. LOL. Really, it has worked for friends of mine. Should work for others. |
Chuck Lott (67.33.174.222)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 02, 2004 - 10:37 am: | |
I think I'm all set now- I checked at my local RV parts dealer and he had most options excluding the spin welded.
He had the pop in gromett , but didn't advise that on the lower half of the tank.
He did, however have the 4 bolt flange in the 3" variety that was previously mentioned, so I purchaced one of those.
I made a stop by Lowe's and picked up stainless bolts, nuts and washers. I also have rubber washers.
My plan is to drill the bolt holes and tap them (1/4") then, run the bolts thru from the inside with the rubber and stainless washers. I'll make a gasket for the 3" fitting.
It should be good to go. Thanks for the help. Chuck |
CoryDane RTSII (66.155.188.42)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 02, 2004 - 12:57 pm: | |
I've seen the pop in grommetts advertised on web sites and offered as the only way to access the tank. Are the RV guys saying this is a bad idea?
There was talk here about threading the tank and screwing in a pipe with threads, how does this play in the scheme of things?
My RV shops do not offer plastic welding either so I am looking for an effective alternative as well.
"Imagine"
cd |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 02, 2004 - 1:46 pm: | |
The pop gaskets are fine for the top of the tank, ie if you mount the toilet directly over the tank, that's a great way to get the pipe in. But for the bottom, no good.
Threading the tank isn't much of an option becuase there isn't enough wall thickness to get you a reliable number of threads. Also, "bungs" like they use in big plastic storage tanks- a threaded pipe with a threaded flange on the inside and another on the outside, aren't much good either because the gaskets tend to ooze out and eventually leak.
The bolt-flange above is second best, spin welding is the preferred method.
Cheers
Gary |
Dale MC8 (69.19.172.250)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, July 02, 2004 - 1:51 pm: | |
The grommets are not strong enough to stay in place with any pressure on them. They work on the top of the tanks but may give way if installed on the side.
Spinwelding in fittings is a good way to get a threaded opening in a tank. RV shops should be able to do this. Tank mfg's also offer this service. You could even use a homemade fixture to spinweld them yourself. Use a 1/2" router or a big angle grinder. HTH Dale |