Originally Posted by oldred
That system with the second tank is what we used to call a "Thump tank" and it does indeed work quite well. Another common setup I have seen uses a large pipe set vertically or, as was often done, a large drive shaft was used. This does work quite well and does for the reasons described just keep the "Thump tank" on regulated pressure.
BTW shouldn't be Physics class?
Take that drive shaft (or 4" x 12" pipe threaded at both ends with caps) and just fill it with desicant balls from HF ...Your "in" tube goes to the bottom ,the out side is just tapped into the top cap...Dont use PVC though...