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Old 03-13-2015, 06:48 AM   #1
Skoolie
 
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Waste tank size and material?

Looks like I'll be custom fabricating my fresh and waste water tanks (big surprise there right?), and being new to this whole RV thing I have questions.

First, what capacity should I make the tanks? I know this depends on a lot of variables, so let me throw some at you. A family of four, two adults and two kids, boon docking for up to 6 days, with shower and vanity and sink, as well as a toilet. What would be a good/standard capacity for each of the three tanks?

Second, what would be the best material to make them out of. I currently am looking at three options; plastic using angle iron as a frame and sealing the edges, aluminum, or stainless steal. I'm a little skiddish of the plastic because it would be flat pieces, sealed at the corners, instead of one blown piece with no seams. What are the pros and cons of each of these materials?

Thanks in advance, I always find good advice around this place.
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Old 03-13-2015, 10:44 AM   #2
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Why did you decide to build your tanks?

Polly tanks are cheap, and available in almost any size from a few hundred manufactures nation wide.

I love custom building things. However, a water tank is one thing I'm buying because cost wise, I can't beat how durable a one piece Polly tank is.

The only tank I will be building is my 100 gallon boiler. All 14 ga stainless steel. Costly as hell.

Nat
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Old 03-13-2015, 11:53 AM   #3
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I haven't been able to find any in the dimensions that will fit my applications, at a reasonable price. I have 8 inches of clearance to work with, the way I have it laid out, and 42 inches wide, length is the only variable. However, if you know of a place that has something for a reasonable price, I'm open to change. Just the ones I've seen have been several hundred dollars, when I can build them for less than half what the poly tanks cost.
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Old 03-13-2015, 12:14 PM   #4
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What are you thinking of using to build them?

Why only 8 inches high? Where are you mounting it?

Nat
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Old 03-13-2015, 12:15 PM   #5
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I agree on the poly tank recommendation - if you can find one. If not, if _I_ was going to custom build a tank that didn't have to hold pressure/heat (grey or black water tanks, or maybe fresh water) I'd probably use fiberglass.
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Old 03-13-2015, 12:17 PM   #6
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These tanks are 8":
Amazon.com: Valterra R8030 8" x 16" x 30" ABS Water Tank: Automotive
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Old 03-13-2015, 12:31 PM   #7
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Nat,

My first two options are aluminum or stainless steal, I could use a plastic polymer, but I don't have much experiance with it so I'm not sure if I want to go that route.

I'm building a raised platform to put my walk-through bathroom on, to get it above the wheel wells. So I figured that would be the perfect place to put the waste tanks, directly beneath the toilet (black) and shower (grey). My fresh water will be beneath the bus, between the frame rails.

Taskswap,

That's a lot smaller than I was thinking I would need, which is why I'm asking these questions. At that price, for what I was thinking, it would cost me around $650 and I would still have to plumb several tanks together.

My original thoughts were; grey tank 42x48x8 = 70 gal and black 42x36x8 = 52 gal

And fresh water I will have two tanks 25x30x20 = 65 gals each

but I don't know if this is over kill for a family of 4 to go a week at a time.
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Old 03-13-2015, 01:03 PM   #8
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Most skoolies do the opposite. The fresh water is in the cab of the bus, and waste tanks are under the bus.

Your fresh water need depend on the number of showers per week, how many times the toilet will be flushed, ect.

Black tank sizes can be estimated by the liters per flush of your toilet, + 20% for urine and poop, over the week you need it to last.

Gray tank can be estimated by how many liters per minute your shower head is, times the number of minutes the shower will be used per week.

And of coarse, you can't use any more water than you have in the fresh tanks unless your connected to a shore water connection.

Nat
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Old 03-13-2015, 01:14 PM   #9
Skoolie
 
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But my shower doesn't use liters, I'm an American, WE USE GALLONS! lol, \m/
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Old 03-13-2015, 01:22 PM   #10
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We use both systems here.

I was born into a age of having to know both systems. As a building contractor I have to convert in my head all the time.

All our building materials are still the standard system. Our land is still surveyed in miles.

Fuel, oil, ect is sold by the liter.

Water is sold by the gallon.

It's all really dumb.

Nat
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