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Old 05-18-2017, 05:12 PM   #1
Mini-Skoolie
 
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School me on allthread for install grey and black tanks underneath

Im at a stage where I have my tanks now but Im not too sure how to approach getting them installed under the bus. Lots of people have welded up frames using angle iron. I dont have any welding equipment nor do I want to invest in any.

I have seen some allthread applications. Will it work for a 30 gallon black and an 85 gallon grey?

Did you "hang" it from the steel floor of the bus? Or was it hung from the cross bracing? What did you hang it with?

Any info appreciated!
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Old 05-18-2017, 05:21 PM   #2
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Originally Posted by -cycosis- View Post
Im at a stage where I have my tanks now but Im not too sure how to approach getting them installed under the bus. Lots of people have welded up frames using angle iron. I dont have any welding equipment nor do I want to invest in any.

I have seen some allthread applications. Will it work for a 30 gallon black and an 85 gallon grey?

Did you "hang" it from the steel floor of the bus? Or was it hung from the cross bracing? What did you hang it with?

Any info appreciated!
I used uni strut & allthread to make mounts for my waste tanks & propane tanks.
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Old 05-18-2017, 05:25 PM   #3
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Check out today's discussion on drilling welding the frame.
All thread is great and will hold almost anything you want to.
The only issue with all thread is if you have to bend it? According to manufacturer's testing and a lot of other sources it loses its strength at around an 8 degree deflection.
Use galvanized or zinc coated and never worry about it again.
I used galvanized UniStrut all the way around and short pieces of all thread for bolts.
Exact fit with no adjustment? But that was my choice.
If you do use all thread I would recommend double nuts on each end for jamnuts or locknuts,lock washers only work if you can Jim them and make them lock?
Check out the other threads today
Good luk
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Old 05-18-2017, 05:50 PM   #4
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I get how to install the bottom part but I dont get how to install the top portion.
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Old 05-18-2017, 06:49 PM   #5
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I get how to install the bottom part but I dont get how to install the top portion.
I ran two hangers per tank, equidistant from the tank ends or if not a flat bottom tank, then wherever appropriate once you get to that point.

To run those angers I went on the frame at a high point in the corrugated metal floor enclosure. Slid them in form the side of the bus and just over the second piece of the main bus frame. Beam clamp there,2 per side.
So you can picture them resting on the frame extending to as far out on either side of the bus as you want. I can't remember the maximum hanger length roughly 6-7 feet.

So now you can see where the rods have to go to suspend the tank, 4 per tank. You may know in advance and be able to pre-drill but the main hangers can be taken out as that is heard to drill under there.
I just used 3/8 galvanised rod and washers nuts. I intentionally damaged the threads on the bottom of each rod once I knew everything was to my liking appearance wise.

Over the main frame you could fit black pipe also but steel mounted easier with clamps.
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Old 05-18-2017, 11:45 PM   #6
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I hung my two 110-gallon water tanks and the 115-gal gray tank with ten 1/2" threaded rod hangers each, and the 65-gallon poo tank has six 1/2" hangers. Yes, I know that's overkill, even after factoring in possible dynamic loads of two to three times their static laden weight. The water tanks' inner hangers are attached at their top to five pieces of heavy channel steel that span the frame rails' lower flanges, but all the gray tank's hangers are straight in the frame rails! I drilled 1/2" holes exactly on the centerline of the lower flanges - drilling through 90,000 PSI steel is not fun until I realized I could push the drill up with a 12-ton bottle jack - easy! And before you say I shouldn't have drilled through the frame, Crown drilled holes everywhere for spring brackets and whatnots, sometimes not even on the neutral-stress centerlines, so I'm not worried at all about making a few more holes. The water tanks' and poo tank's outer hangers are attached through longitudinal stringers connecting the floor and side walls. All four tanks sit on support frames made from heavy angle steel (courtesy of USMCAS El Toro!) with 1/2" plywood bases, and the water tanks also have 1/2" ply sides to protect them from road debris and to help slightly insulate them.

It was a PIA to install each tank, but thankfully it was a one-time job - I had to jack up the side of the bus sufficient to slide the tank in under the bodyside, lower the bus back down over the tank, then manhandle it up into position before securing it to the hangers. Each complete water tank weighed just over 100 pounds empty! It took a full eight hour day just to install each of the three big tanks.

You're only going to do this job once, so do it right. Use more hangers than you think it will ever need, double-nut them, and positively prevent any longitudinal movement of the tanks so that their hangers only have to support them vertically. I sometimes try to imagine if my bus were to be picked up and shaken vigorously - would anything move or loosen at all?

John
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Old 05-19-2017, 12:10 PM   #7
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How did you prevent forward/backward movement?
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Old 05-19-2017, 12:42 PM   #8
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Quote:
Originally Posted by -cycosis- View Post
How did you prevent forward/backward movement?
Not sure if that question was for me or John Iceni. In my case I had no bottom frame. Once my rods were hung I then used 1" pie, 2 lengths that just were a bit wider than the tank itself, one on top, one underneath the tank. The nuts on the rod then turn upon the bottom with the use of flat and lock washers and down on the top pipe to sandwich the tank. It really stiffens the whole build up and there is zero movement in any direction.
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Old 05-19-2017, 01:22 PM   #9
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Hey Blackjohn, could you post a pic or a link on exactly what your talking about as far as Beam Clamps, The ones I see online I'm not quite grasping exactly how you did it. Thanks
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Old 05-19-2017, 03:16 PM   #10
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Hello Stu and Filo too. Nice of you to ask and I will get something to you soon on this. I haven't posted any pics yet as I am waiting for when I have my bus more finished inside, should be soon.
Stu, you seem familiar with fasteners, esp UniStrut etc. The clamps I discussed are used in the trades for hanging rod for all types of piping runs. They are essentially a C clamp looking affair with a bolt on one side that tightens down on the beam and the rod screws into the other end.The bolt has a jam nut on it and makes it pull very tight to the beam. I did this about 3-4 years ago so haven't touched it again. Actually, I may have used a U bolt over my pipe hangers and then tightened on the beam.
I will do my best to get pics for you soon, maybe you can post them. I am limited to time and presently incapacitated.

John
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