by troubleScottie » Sun Sep 25, 2016 2:28 pm
So doing the math. Assuming that the inner diameter is really 4", you can fill the entire volume with water, and a gallon of water occupies 231 cu inches; then 1 foot of pipe holds 0.65 gallons ((pie * 2 squared ) square inch * 12 inch)/ 231 cu inch per gallon = 0.65 gallon)
Four foot pipe is 2.6 gallons and five foot is 3.2 gallons.
Questions:
How do you vent the pipes? Having a value on one end only, means there is air trapped in the pipe when filling or a vacuum when draining. I am assuming you are pumping the water out.
Can you over pressurize the pipes? The original description is not a gravity feed.
Do you have a value per pipe or a centralized valve? Multiple valves will slow the fill process and make you have to move connections as you drain it.
Is the pipe safe? I am reasonable sure PVC/ABS is no used for potable water. Drains, yes. Potable water, no. Of course, if this is for showering, maybe it is fine.
If the pipes are partially empty, does the weight shift when stopping/starting/climbing/descending make a difference? Every water tank to some extent has this issue. But a standard tank has approximately the same center of mass or it is only moving a short distance. Is that why suggesting only a 4 or 5 foot pipe and not 8 to 10 foot pipe? Or is the weight insignificant given the partial volume?
Michael Krolewski
Scottish Terrier Fancier