Installing second gray water tank
I'd like to install a second gray water tank under my TT. There is room for it forward of the other gray tank and I plan to connect the two of them at the bottom so they both drain at once. What s...
Forum Discussion
Oldme wrote:
Don't forget about weight.
A US gallon of fresh water weighs approximately 8.345404 pounds, so 50 gallons would weigh approximately 417.2702 pounds.
"approximately"? :@
The old adage "A pint's a pound the world around" is easy to remember, and close enough to being true for a rule of thumb...so long as you're talking about water and not some other liquid...and so long as your world is limited to the United States and not, say, the United Kingdom.
For the original poster, you do need to have the new tank vented to the outside (such as by joining to the existing vent well above the top of the tanks), and you need to have the drain at the low point, and a continuous drop in the drain line from the outlet of the tank to the outlet from the RV, under whatever level or not-quite-level conditions you may be draining the tanks in. (Sewage doesn't flow uphill very well.)
Additionally, it would not hurt to give some thought to the connections between the tanks and what sorts of sloshing around and between them you might encounter when traveling on grades, and whether they would fill equally when in use. If the tanks are both centered laterally on the RV, the worst of the problems would be limited to forward and aft weight distribution oddities and would probably not be overly tricky to deal with. Tanks arranged laterally could have stranger behavior; going around a long corner (or a side hill) would leave the trailer unbalanced until the contents leveled out again. Likely it would not be a huge issue for a travel trailer where the tanks are fairly low down and relatively small compared to the overall size of the trailer. Sloshing in tanks is a very real concern for drivers of tankers, fire trucks, etc.
