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Second electric bilge pump
I know that check valves in bilge pump outlet hoses are frowned upon, for good reason. I do currently have one, though. It prevents pump cycling after all of the water in the hose (which did not get all the way to the thru-hull) comes draining back into the bilge. I am contemplating retaining the check valve in my current setup, but adding another electric pump, higher up, which does not have a check valve. The lower one will remain for workaday use, and the upper one is for emergency use. If all is well, the upper one will never have water in its outlet hose which can then run down into the bilge. But if you do use the higher pump, it just needs to be higher than the point in the bilge which represents the water height of both of the hoses having drained themselves.
I am wondering, folks: if I install this upper pump, is there any downside to having it tee into the outlet hose of the lower pump? I guess what I am asking is whether in an emergency, that single hose could handle the output of both pumps running simultaneously, without restricting the flow. My brain cannot quite get around that part. My guess is that it depends upon the diameter of the hose. (No, I cannot tell you from here what size my hose is, or what the outputs of the pumps--current and envisioned-- are.) If the bottom pump died, the water from the upper would not be able to go thru the tee and head down to the bilge, because of the check valve.
I am thinking that this upper pump would be in something like a plastic milk crate, and would hang in the bilge, about halfway down. The fitting to the outlet hose would be something that is easily detachable, so if you want to get at something below, you can haul up the basket, undo the hose, and get the pump out of the way. Similarly, the wiring would also need a user-friendly connector, or excess length.
Does this plan make sense?
Cape Dory 31