Good info Mike, I will have to look into a centrifugal also.
Anyone have any experience with one of these?
FA Series Diaphragm Pumps - Mud Sucker Pumps
I emailed them and they suggested models 2FA or 3FA.
the linked peaked my interest. it more like a piston pump. but has a rubber O-ring / diaphragm. to allow for a bigger piston. at same time keeping oil and like out of the water.
never done it myself, but just over years on farm and ponds and like. and diaphragms. just scare me, when i start thinking about amount of pressure that would be putting on them. then the abrasive nature of all the mud/silt/sand/small rocks. that will take a toll on the diaphragm rubber. plus if ya let it set and try to re-use it a couple months later possible cracking of the diaphragm and need to do a replacement of it.
on other hand. looking at it. if the diaphragms were cheap and easy to replace without much effort or tools needed. i would think this setup might be more forgiving long haul to motor, shafts, seals, piston, etc... just not on the diaphragm itself.
as far as centrifuge pumps, *cringes* i would be looking at a "rock pump" or "concrete pump" knowing my luck, if i went with anything less, i would be cracking blades, blowing seals, bending shafts. if it was pure sand like mixture on other hand. i might go with something less.
my worry is, the mud/sand/silt/etc... acting like sand paper, and just eating away at any sort of blades. or internals of pumps. not to mention the occasional rock that will go through and be like a gun hitting the insides of the pump.
on another note. the diaphragm pumps you noted. i would assume has 2 check valves, one to let water in, and one to let water out. as piston raised and lowered. these could get pretty banged up. or get stuck open with a rock or something. or perhaps with some wear not close all the way. would be a concern.