Want to modify a fresh water tank.

stand up or sit down...to sink or not to sink...want or got gas...post your Q&A here..........

Want to modify a fresh water tank.

Postby daveesl77 » Wed May 24, 2017 7:28 am

To begin, our "onboard" fresh water system consists of two, 5 gallon plastic cube type water jugs from wallyworld. I modified the lids and they work ok, giving us 10 gallons feeding into a pressure pump.

With that said, when I did my RV junk yard scavenge almost two years ago, I found a 38 gallon, standard RV, fresh water tank and got it for $10. It has been sitting on a shelf, fully cleaned and sealed, since I got it. And that drives me crazy. Here is a perfectly good, but admittedly very large water tank and it does nothing but sit on a shelf. So my thought is to modify it, to cut it down to say, 10 gallons or maybe a bit more. Its circumference measurement fits perfectly in the space where I presently keep the two water jugs, it is just really long.

So, the idea is to cut it down, then to seal the end up to make it a smaller tank. Does anyone know the proper way to "weld" one of those white plastic (I assume poly) water tanks? Or am I asking for trouble?

dave
*******
Dave and Regina - Enjoying old age, a LOT!

Build Journal - http://www.tnttt.com/viewtopic.php?f=50&t=62386
User avatar
daveesl77
Donating Member
 
Posts: 785
Images: 271
Joined: Tue Jan 27, 2015 4:33 pm
Location: Central Florida

Re: Want to modify a fresh water tank.

Postby Nobody » Wed May 24, 2017 9:37 am

Dunno exactly what you have but, in my experience most fresh water tanks that are not metal, are made of some kind of polyethylene or polypropylene. Neither accepts adhesive very well. Most poly items are bonded with heat using special, item specific bonding methods/equipment. If you aren't set-up to bond the particular tank you have, I think I'd either use it as is or try to sell it to someone that might be able to use it. I don't personally know of any adhesive that works effectively with poly material... We've used a 7gal square, Aqua-tainer from WalMart successfully for over 10yrs. Just refill it when necessary.

If you can acquire a commercial grade 'plastic' welder, you MIGHT be able to achieve a suitable joint. I'm not sure I'd trust it with water tho. That's a lot of weight (10 Gal + approx 82lbs) especially sloshing around when only partially full. I think you may just be asking for trouble but than again, I've never been particularly adventurous when it comes to things I'm not really qualified for.

Good luck on whatever you decide.
Harvey -

- - - - - - - - - - - - - - - -

Doing the right thing ain't always easy but, . . . it's always right!
User avatar
Nobody
1000 Club
1000 Club
 
Posts: 1197
Images: 342
Joined: Wed Jan 25, 2006 1:09 pm
Location: Benton, Arkansas

Re: Want to modify a fresh water tank.

Postby Shadow Catcher » Wed May 24, 2017 6:16 pm

I have not done it my self but a proper plastic weld is as strong as the original tank. The question is will you save any money.
The Harbor Freight welder is $50, with some risk in can you get it right , I do not know if I would trust my own work and I know how to weld. You can look for a plastic welder in your area, there are a couple in the Toledo area.
The other alternative buy a new one, search RV water tanks some in the $50 and you can specify inlets etc. Try Ebay one 10 gal at 33.79 with shipping.
User avatar
Shadow Catcher
Donating Member
 
Posts: 5611
Images: 192
Joined: Sat Apr 11, 2009 8:26 pm
Location: Metamora, OH
Top

Re: Want to modify a fresh water tank.

Postby lrrowe » Wed May 24, 2017 8:43 pm

I had a serious lapse in good sense awhile back and screwed a screw through a wall right into my plastic water tank. And I did not catch this problem (leak) until my a recent outing to First Landing, VA. I plugged it using a heat source (propane touch). I to gently melted the plastic around the hole with the touch. The plastic would melt, but not fill in the hole. I ended up using of all things, an archery arrow flecthing melt stick and plugged the hole. It seemed to hold up well enough through the tests I ran. I also using a larger piece of plastic sheet to cover the whole side and used silicone sealant as a cement.

I use this explanation as a small encouragement that you can fuse the plastic together.
Bob

First Post on Purchase of Trailer: http://www.tnttt.com/viewtopic.php?f=42&t=60722
Hot water infloor and radiator heating project:[url]http://www.tnttt.com/posting.php?mode=reply&f=54&t=62327[/

Image Image
User avatar
lrrowe
Donating Member
 
Posts: 3270
Images: 439
Joined: Sun Feb 10, 2013 5:54 am
Location: SW Virigina
Top

Re: Want to modify a fresh water tank.

Postby MtnDon » Thu May 25, 2017 12:05 am

Build a bigger trailer for it. :lol:
Our 6x12 deep vee nose cargo trailer camper conversion... viewtopic.php?f=42&t=58336

We have a small off grid cabin we built ourselves in the NM mountains; small PV solar system; 624 watts PV, Outback CC & inverter/charger ... http://countryplans.com/smf/index.php?topic=2335.0
User avatar
MtnDon
1000 Club
1000 Club
 
Posts: 1942
Images: 6
Joined: Sun Aug 19, 2012 10:57 pm
Location: New Mexico
Top

Re: Want to modify a fresh water tank.

Postby daveesl77 » Thu May 25, 2017 6:57 am

MtnDon, perfect answer! ha ha.

I wasn't sure if anyone knew some trick to doing something like this or not. The original idea was that I would carry it in my truck bed and if going somewhere that would have very limited access to water I could fill the entire tank and be able to go for many, many days. Truck is gone now, and while it would easily fit in the van, the physical size is just too big for what I want.

Wife to me when I brought it home - "Why did you buy that thing?"

Me to wife - "But it only cost $10 and look how much water it can hold"

W2M - "Where are you going to put it?"

M2W - "I don't know, but it only cost $10"

:D

dave
*******
Dave and Regina - Enjoying old age, a LOT!

Build Journal - http://www.tnttt.com/viewtopic.php?f=50&t=62386
User avatar
daveesl77
Donating Member
 
Posts: 785
Images: 271
Joined: Tue Jan 27, 2015 4:33 pm
Location: Central Florida
Top

Re: Want to modify a fresh water tank.

Postby lrrowe » Thu May 25, 2017 7:05 am

If you were closer to me, I would offer to buy it from you. That size would fit my plan to carry extra water in my truck and pump it to my CT tank when going off the grid.
Bob

First Post on Purchase of Trailer: http://www.tnttt.com/viewtopic.php?f=42&t=60722
Hot water infloor and radiator heating project:[url]http://www.tnttt.com/posting.php?mode=reply&f=54&t=62327[/

Image Image
User avatar
lrrowe
Donating Member
 
Posts: 3270
Images: 439
Joined: Sun Feb 10, 2013 5:54 am
Location: SW Virigina
Top


Return to Plumbing & Propane Secrets

Who is online

Users browsing this forum: No registered users and 1 guest