I'm looking at running a line from an electric bilge pump to a through hull somewhere on the boat, the question being where. Most of the time this is usually in the stern, located somewhere above the waterline, but has anyone put their through hull midships, up near the cove stripe, and put a rubber scupper cover on it? I know that water would be coming in if you laid the boat down enough on its side, but how likely is that to happen for more then a few seconds? Would it be like a following sea, which might have the same effect on a stern through hull? *o
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Bilge Pump Outlet Locations
Jim We spent most of Saturday afternoon with our rail in the water in a race in high winds on SF Bay. An amidships bilge outlet would have been dangerous to say the least. I don't know if you race or not, but you might want to reconsider and go to only a transom mounted outlet. True, our low transom mounted bilge outlet goes underwater when we rev the engine up past normal cruising rpm to push the envelope to warp speed for a few moments (passing tugs, barges and st***potter's wakes) but usually it's fine. Your boat's reserve buoyancy should keep your stern up in following seas. Occasionally you might get a wave to break on your transom, but most of the time you'll be moving faster than the following waves anyway. Why not just mount it a bit higher on the transom? Stu
Jim We spent most of Saturday afternoon with our rail in the water in a race in high winds on SF Bay. An amidships bilge outlet would have been dangerous to say the least. I don't know if you race or not, but you might want to reconsider and go to only a transom mounted outlet. True, our low transom mounted bilge outlet goes underwater when we rev the engine up past normal cruising rpm to push the envelope to warp speed for a few moments (passing tugs, barges and st***potter's wakes) but usually it's fine. Your boat's reserve buoyancy should keep your stern up in following seas. Occasionally you might get a wave to break on your transom, but most of the time you'll be moving faster than the following waves anyway. Why not just mount it a bit higher on the transom? Stu
Bilge Pump Discharge
Long indirect (bends) runs of discharge hose significantly reduce bilge pump capacity. Although midship hull discharges may be placed closer to the pump (reducing these losses), and ABYC rules do not prohibit them (see summary below), I (like Stu)highly recommend the conventional transom location. I also recommend the installation of an anti-siphon (vent) loop and seacock, even on the transom mounted discharge. Bilge Pump Discharge (ABYC H-22): 8.6 The discharge location shall be above the maximum heeled waterline. ~OR~ 8.7 Below the max. heeled waterline if discharge is provided with BOTH: 8.7.1 A seacock ... ~AND~ 8.7.2 A vented loop (or other anti-siphon means) ... NOT a check valve! FWIW, Gord
Long indirect (bends) runs of discharge hose significantly reduce bilge pump capacity. Although midship hull discharges may be placed closer to the pump (reducing these losses), and ABYC rules do not prohibit them (see summary below), I (like Stu)highly recommend the conventional transom location. I also recommend the installation of an anti-siphon (vent) loop and seacock, even on the transom mounted discharge. Bilge Pump Discharge (ABYC H-22): 8.6 The discharge location shall be above the maximum heeled waterline. ~OR~ 8.7 Below the max. heeled waterline if discharge is provided with BOTH: 8.7.1 A seacock ... ~AND~ 8.7.2 A vented loop (or other anti-siphon means) ... NOT a check valve! FWIW, Gord
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