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Old 01-10-2019, 10:36 AM   #11
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I tested PEX pipe a few years back. Made a continuous loop of 3/4" pex and assembled it under water so there would be no air in the loop. After being out in well below freezing temps all night there was no damage to the PEX at all even though the water was frozen solid.

I read somewhere that what breaks copper pipe isn't the ice itself but the air pressure that builds up when the water expands as it turns into ice. I've read recommendations about letting faucets drip in a house that's in danger of freezing so the pressure can bleed off. I may test that theory out too (it's winter and I'm bored).

I suspect that ice damage in a flexible containment system may not be what we fear it to be, but I'll still drain my system each fall.
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Old 01-10-2019, 10:45 AM   #12
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We're just getting our demo wrapped up, so I haven't done the installation yet, but our plan is to mount the tanks under the bus. Our plans don't involve spending much time in freezing weather, but I'll still be building in a drain so I can dump the whole system, if necessary. With the way our bus is structured, I think I should be able to get two 50 Gallon fresh water tanks shoved up between the cross members, above the frame rails and probably 30 Gallons for grey water. No black tank on our build, since we're going with a composting toilet.
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Old 01-10-2019, 10:58 AM   #13
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We're just getting our demo wrapped up, so I haven't done the installation yet, but our plan is to mount the tanks under the bus. Our plans don't involve spending much time in freezing weather, but I'll still be building in a drain so I can dump the whole system, if necessary. With the way our bus is structured, I think I should be able to get two 50 Gallon fresh water tanks shoved up between the cross members, above the frame rails and probably 30 Gallons for grey water. No black tank on our build, since we're going with a composting toilet.
Do you have a plan drawn out? if so, would you mind posting it? Or if not, will you post photos once you do the install?
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Old 01-10-2019, 11:19 AM   #14
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I've read recommendations about letting faucets drip in a house that's in danger of freezing so the pressure can bleed off.
It's not a matter of pressure, i'ts the water moving slowly, preventing ice crystals from anchoring to the pipe walls. If it gets cold enough, even a drip won't be sufficient.
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Old 01-10-2019, 11:37 AM   #15
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Firebuild, here's how.

.

The two tanks are connected to form an "L" which allows for some under bed storage (queen bed, slide out extended).


.

The stove is fastened to the top of the frame for the grey water tank.
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Old 01-10-2019, 11:43 AM   #16
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Firebuild, here's how.

The two tanks are connected to form an "L" which allows for some under bed storage (queen bed, slide out extended).

The stove is fastened to the top of the frame for the grey water tank.
Jack
I see! What a great old bus. Unfortunately not a set up that would work for me with my murphy bed, but very cool.
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Old 01-10-2019, 11:59 AM   #17
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Do you have a plan drawn out? if so, would you mind posting it? Or if not, will you post photos once you do the install?
I don't have any "plans" but I do have a schematic that I drew up. The hot water heater will be installed inside the bus and the 12V pump will be underneath the bus, with the feed panel on the drivers side of the bus.
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Old 01-10-2019, 04:42 PM   #18
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Regarding PEX and freezing....

I plumbed my last bus with PEX and spent way to much time in freezing weather.

I had PEX pipes freeze many times and only had it burst and flood the bus once.... PEX is much more tolerant to freezing than copper but not bulletproof.
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Old 01-10-2019, 05:03 PM   #19
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I don't have any "plans" but I do have a schematic that I drew up. The hot water heater will be installed inside the bus and the 12V pump will be underneath the bus, with the feed panel on the drivers side of the bus.
Thanks for this! I'm still trying to figure things out.
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Old 01-10-2019, 05:04 PM   #20
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Regarding PEX and freezing....

I plumbed my last bus with PEX and spent way to much time in freezing weather.

I had PEX pipes freeze many times and only had it burst and flood the bus once.... PEX is much more tolerant to freezing than copper but not bulletproof.
Good to know. I guess nothing is completely impervious to freezing.
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