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12-18-2017, 09:06 AM
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#1
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Senior Member
City: Essex, Ct.
Vessel Name: Harmony
Vessel Model: 1982 41' President
Join Date: May 2013
Posts: 436
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Internal water tank vent ?
My external water tank vent is plugged - corroded and impossible to access from either inside or outside. Is there a device that I can place on the inside of the boat on top of the tank to evacuate the air so water can be plumbed in ?
We are live aboards and in the winter the Marina staff has agreed to fill our water tanks weekly. The only obstacle is the venting. We currently crack open the hose at the tank to vent it when we fill it up. I don't think the Marina staff would be that diligent in their technique. I would like to install a vent inside the boat to perform this function. Any suggestions ?
__________________
Tom
"Harmony"
1982 41' President
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12-18-2017, 09:26 AM
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#2
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
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not the greatest solution....an overfill goes into you bilge.
low chance of filling up your boat but you never know.
cant fit a vent someplace else overboard? very hard to believe that at some point you cant tap in....
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12-18-2017, 09:28 AM
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#3
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Guru
City: Looking
Vessel Name: --
Vessel Model: Between boats
Join Date: Aug 2017
Posts: 1,190
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Quote:
Originally Posted by psneeld
not the greatest solution....an overfill goes into you bilge.
low chance of filling up your boat but you never know.
cant fit a vent someplace else overboard? very hard to believe that at some point you cant tap in....
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Maybe if you could get the end higher than the deck fill it would lessen that probability.....
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12-18-2017, 09:47 AM
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#4
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Guru
City: AR
Join Date: Jul 2009
Posts: 2,514
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If you can access the vent fitting on the tank, the best solution would be to run the vent line (which prob'ly should be new hose) to a new thru-hull that's accessible.
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12-18-2017, 10:00 AM
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#5
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Guru
City: Philadelphia, PA
Vessel Name: Revel
Vessel Model: 1984 Fu Hwa 39
Join Date: Nov 2015
Posts: 1,024
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I imagine your tanks are as inaccessible as ours. The tank fill and vent are concealed on top of the tank and the tank was enclosed in the ceiling tile.
However, you probably have the vinyl tube 'sight glass' too. Tee your new vent into the top end of it. All you have to do is get the new vent above the fill level and the marina folks will have wet feet before they fill your bilge.
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12-18-2017, 12:19 PM
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#6
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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We have an 87 President 41. There are 2 tanks under the galley deck and the forward cabin deck. If I had to replace the vents, I would probably run a new vent up the outboard side of the galley and the outboard side of the dinette. My dinette is on the port side and galley to starboard. However there are many layout variations on the 41s. You will have to see where you can route new vent(s). Good luck, let us know how it goes.
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12-21-2017, 03:54 AM
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#7
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Guru
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,264
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Use a vent valve. Has a ball float that seals off when tank is full
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12-21-2017, 08:59 AM
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#8
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Guru
City: Palm Coast, FL
Vessel Name: Coquina
Vessel Model: Lagoon 380
Join Date: Jan 2017
Posts: 2,570
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Quote:
Originally Posted by sdowney717
Use a vent valve. Has a ball float that seals off when tank is full
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THat method is certainly done for millions of on the road vehicles for the fuel system, and does have merit. A couple of fairly small downsides:
The "filler person" is alerted of a full tank only when the fill overflows, since there is no "smart" sensor in the hose, and no vent to look at. Usually, not an issue to have overflow water around the deck fill, unless its freezing out.
Second, if the tank is filled with water, and the float is floating, sealing off the system, any heating of the water in the tank (by engine or environment) could cause pressure to develop in the tank system. Possible to get a tank bulge, but would depend on the amout of any trapped air, which could be very low.
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12-21-2017, 09:55 AM
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#9
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Guru
City: NARBONNE
Vessel Name: 'Snow Mouse.'
Vessel Model: BROOM FLYBRIDGE 42.
Join Date: Apr 2014
Posts: 1,733
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From my own experience my advice would suggest you follow Peggy's. K.I.S.S.
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12-21-2017, 02:02 PM
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#10
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Senior Member
City: Hervey Bay
Join Date: Nov 2016
Posts: 128
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Our tanks vent inside and overflow goes into the bilge, never a problem and gives the bilge a rinse.
For fillers, I turned three through bulkhead fittings which mimic male garden hose joiners, so the fill hose just locks onto them. The centre one has an internal thread to allow a knurled knob to retain the cover.
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12-24-2017, 06:04 PM
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#11
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Guru
City: Palm Coast, FL
Vessel Name: Coquina
Vessel Model: Lagoon 380
Join Date: Jan 2017
Posts: 2,570
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Is there a radio equipped bilge attendant?
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12-25-2017, 07:07 AM
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#12
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Guru
Join Date: Oct 2007
Posts: 22,553
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Remove the fill cap and drill a slanted hole in the fill pipe that will end below the deck level.
DONE.
When filling a hose stuck in the fill pipe will gurgle to allow the air in the tank to depart and when full the water gushing out the fill cap should alert you .
The small hole in the fill supply will allow water into the boat only when the fill is overflowing , the rest of the time even a 1/4 hole will vent enough even for a quality 10GPM water pump like a Head Hunter .
KISS
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