Anyone have suggestion for a way to keep the hose from back-draining a
bucketful after the pump shuts down? A small pump with small diameter
hose?
Bigger pump & hose with a check valve? Trade offs, tradeoffs . . . .
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In our Pan Oceanic 46, we have an inline?check valve installed in the bilge pump hose, it doesn’t stop all the water from returning to the bilge, but it does stop a majority of the water. Some will argue that a check valve may become clogged, and rightly so, but in two years of operation in conjunction with the Rule pump screen have been able to sucessfuly pass small particles without any clogging.
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Prior to installing the Rule pump, we had a Jabsco diaphragm bilge pump Rule part number 36680-2000 5.5 gpm/330gph installed with a small Jabsco strainer and check valve. The up-side to the diaphragm pump is having the ability to mount the pump?where it was easy to access, being able to draw water from a deep sump (head heigth), and locating only a hose and strainer in the?bilge. Down-side are many, cost of the pump is $279.00, pump service kits are $84.99,in addition to the inline strainer, hose end strainer; the cost of comparable 360gph pump and float switch kit is $36.49 part number Rule 25/35. In addition to cost, we found the diaphragm pump valves do not like minor debris and fuel/oil/chemicals normaly found in engine sumps, in a perfect world there would only be water down there, foreign material which stops the diaphragm pump cold, doesn’t seem to bother the less expensive plastic Rule pumps.
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Everyone has there little bilge pump horror stories, here is mine; on a delivery from Alameda to Hawaii last year, the owner elected to replace his 1000 gph plastic Rule bilge pump with the diaphragm pump, two days out it failed. Needless to say, due to space limitations, he threw the working Rule pump in the trash before leaving. With a badly leaking propeller shaft packing gland and no material onboard to repack it underway and no spare parts?kit for the new diaphragm pump, why you ask, “it’s new, we don’t need spare parts said the owner.” With Whale pump in hand, we pump our way 2,500 miles to Hawaii. Up-side, we had $20,000 worth of new rigging and electronics onboard, to bad it couldn’t operate the manual bilge pump.
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Believe it or not, some boat manufacturers subscribe to the theory, big boats have plenty of reserve volume, take longer to sink?and therefor require smaller bilge pumps; smaller boats having less volume are subject to sinking quicker and therefore require larger bilge per volume. Is this nuts or what, I’ll bet they haven’t pump 24x7 all the way to Hawaii, if they did, I’ll bet they will change there tune.
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Best advise I can offer: two bilge pumps are better than one, larger the better and always carry a spare pump, float switch and the tools and materials to change out the pump underway. Check the condition of your manual bilge pump, hose and strainer, if not in top form replace it now, don’t wait until its convient to do the job because the electric ones are working fine, you never know when the batteries will go south for the winter. Show everone onboard where the manual bulge pump handle is stored, don’t laugh, we used a screw driver for two day before we found the pump handle
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Best wishes and Happy Holidays,
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Marty Chin, BCC Shamrock