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Go Back   SailNet Community > On Board > Gear & Maintenance > Cockpit Drains
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Thread: Cockpit Drains Reply to Thread
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Topic Review (Newest First)
03-06-2013 08:33 AM
chucklesR
Re: Cockpit Drains

if a cockpit is 8 x 6 and 3 feet deep, and has half that space taken up with seats, wheels tables etc.. that leaves 72 cubic feet of volume.

72 cubic feet of water (64 lbs per cf) = 4608 pounds.
That will shift a water line a touch, it's 25% of my displacement

European Boatbuilder has lots of good info
03-06-2013 06:48 AM
Minnewaska
Re: Cockpit Drains

Quote:
Originally Posted by katsailor View Post
.......What water require capture of gray water? All my sinks drain direct via thru hulls, why don;t they go to the grey water tank?
Grey water restrictions are all local, so you would have to research.

Nantucket Harbor is one, but honestly, I can not believe that virtually any of the hundreds of boats on moorings or anchor have grey water holding or shut down all showers and sinks. The harbor is very contained, probably doesn't flush well and has oyster beds (or maybe clams), so I understand what they are trying to do. They are excellent at getting a free pump out boat to you quickly to keep from discharging black water. Way to go on that one.
03-06-2013 01:51 AM
mitiempo
Re: Cockpit Drains

Sounds like a pretty strange arrangement. Normally the shower drain is plumbed to a device like this:Shower Sump Pump Systems : Attwood Marine
Basically a box with a removable lid, containing a bilge pump, float switch, and strainer. It pumps automatically when the level rises enough.
03-06-2013 01:22 AM
katsailor
Re: Cockpit Drains

The engine is out and I started to puzzle out the MSD system. It is more confusing than advanced algebra. It seems I have a gray water tank and a black water tank, there is a wye valve under the floorboards marked Overboard and Holding tank. At the rear of the heasd is a manual pump. It feeeds into a a Y, the other two legs go to the deck fitting and I assume the thru hull. If you want to pump the gray water tank yu jhave to pump it through the black water tank.

Anyway, what a system, I later found out the manual pump was de riguer equipment for 1980 vintage boats.

Guess I will have to replace most if not all of this or simpley pull the head, pump the tanks and install prta-potti for short cruises.

What water require capture of gray water? All my sinks drain direct via thru hulls, why don;t they go to the grey water tank?
03-04-2013 10:32 PM
Barquito
Re: Cockpit Drains

Quote:
Yeah and my shower drains to the holding tank which I also think is kinda stoopid
It would be nice not to have to decide between showering and using the head.

If I wanted more cockpit drainage capacity, I think I would leave the original drains alone, and add two large additional drains at the other end of the cockpit, or, through the transom if possible.
03-04-2013 08:32 PM
Minnewaska
Re: Cockpit Drains

Quote:
Originally Posted by katsailor View Post
.....Yeah and my shower drains to the holding tank which I also think is kinda stoopid
Actually, there are some waters that require grey water to be held aboard.

Its the rule that is very stooooopid.
03-04-2013 08:20 PM
katsailor
Re: Cockpit Drains

Quote:
Originally Posted by tap View Post
Here's what the ISAF OSR regulations say about bilge pumps emptying into the cockpit.

3.23.1
No bilge pump may discharge into a cockpit unless that cockpit opens aft to the sea.

3.23.2
Bilge pumps shall not be connected to cockpit drains. (OSR 3.09)
Thanks
nuff said

Yeah and my shower drains to the holding tank which I also think is kinda stoopid
03-04-2013 03:50 PM
tap
Re: Cockpit Drains

Here's what the ISAF OSR regulations say about bilge pumps emptying into the cockpit.

3.23.1
No bilge pump may discharge into a cockpit unless that cockpit opens aft to the sea.

3.23.2
Bilge pumps shall not be connected to cockpit drains. (OSR 3.09)
03-04-2013 02:37 PM
bwindrope
Re: Cockpit Drains

I'm tackling a similar thing on Aeolus. I have two drains in the cockpit, each with an opening of 1 1/4 at top and they go down to a 3/4 elbow fitting on the seacock. No good. I'm going to take the seacock off entirely, as they are well above the waterline, and this alone will nearly double the drainage rate for my drains. I might remove and replace the cockpit opening to upsize to 1 1/2" but time will dictate that.

As Salish Sea cruisers and even West Coast Vancouver Island people, we are not forced to endure breaking seas large enough to fill our cockpit as we are never far from secure anchorage. If we were going offshore, that would require a different, more robust approach. We've spent plenty of time in ugly 6+ feet seas but nothing more than heavy splashes have ever violated the sanctity of my cockpit. My main concern is just having drainage large enough to not clog from a wad of dog hair or some random little object that falls down the drains for when I wash her out.

Just for fun, I've been wanting to do that activity you often see in books where you plug your drains, fill your cockpit. See what it does to your boat trim and time the drain. Like most good boats, Aeolus will fill her cockpit to a point where it drains over the transom before it drains into the cabin, but it would still be a lot of water. We have locks on our lockers, but some water would definitely squirt in, but nothing beyond a bilge pump capacity.
03-04-2013 09:00 AM
chucklesR
Re: Cockpit Drains

Routing bilge pumps to the cockpit has only one advantage, you'll know when it's pumping.

You'll know because suddenly all that nasty stuff in your bilge is washing over your toes.

If there were anything I'd do regarding your drainage I'd change that - the rest will do for all but extremes - and then a bucket will work unless you get pooped by a huge wave.
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