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Kitchen water drain

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hansesailor View Drop Down
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    Posted: 06 May 2008 at 13:41
Hi all,
 
the water in the kitchen drain (brand new 400) does not leave the sink in an acceptable time. Though the sink pipe is straight to the hull the only possible reasons could be the (a) link between pipe and sink or (b) construction error due to waterline/sink level. Has anyone experienced a similar problem?
 
Thanks for your help,
Alex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fun & Function Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 15:00
Alex,
 
I have a similar problem on my 370. I believe it is due to the horizontal link hose between the drain pipe and the sink outlet. The way it is laid out, it allows air to be trapped and form a plug in the drain. I have cut the hose by 4-5 centimeters in order to get some slope and drainage was improved a bit. However, it is still not good enough.
 
You can manually test this by forcing the hose to slope more while you are emtying the sink.
 
Steinar

Hanse 370e #348

Oslo, Norway
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Rubato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 16:18
I believe everyone has this problem, I certainly do on my 400 and did on a 30 footer I had years ago. I have a feeling that short of adding a vent pipe the way plumbing is done in houses, we're going to have to live with it...
Steve
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Peter-Blake View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter-Blake Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 17:37
We just got our 370 handed over, last weekend (nice boat, but the dealer has still a lot work to do). I had the same feeling and told my dealer that the drainig is way to slow. He told me that this is on every Hanse this way. The could not tell me how to drain inn faster. I think it is just the air in  the pipe what makes the problem.
Blake 370
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tingeling View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tingeling Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 19:03
It is not a matter of Hanse vs. any other boat. It is a matter of physics, in any boat.
 
If you let the water out say 0,5 m below the wl you have a pressure of 0,05 bar against and a watercolumn of about 1,5 m as a "driving force, equivalent to 0,15 bar, that gives you a net driving pressure og 0,1 bar in the beginning and 0 bar when the waterlevel in the tube is level with the waterline, i.e you will always have water in the hose at the level of the wl.
 
The only way to "fix" this problem is to let the water out above the wl. Then it will run out freely driven by the weight of the watercolumn.
 
This is by the way a good reason for why you should allways close your seavalves when leaving the boat.
 
Tingeling


Edited by tingeling - 06 May 2008 at 19:05
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copain View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote copain Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 20:50
Hi Tingeling,
 
Totally agree with you. Had the same problem  with my previous boat with the sink and I always closed the valves when I left the boat.
 
I always closed all the hull valves anyway leaving the boat. Why take the risk ??.
 
It's only a small job and it saves a lot of hassle at the end.
 
Willem
 
 
s/y Copain (Beneteau 281)
from march 2008 Hanse 350 # 061
Visit my BLOG op http://www.wsv-haringvliet.nl/blog/maatje/
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alettaenmarcel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alettaenmarcel Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 21:16
we have the same problem and we want to make a bigger valve true the hull so we hope the water flowws a way a bit faster.
Anyway we still have the same problem.
greetings Marcel
 
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tingeling View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tingeling Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 21:41
Originally posted by alettaenmarcel alettaenmarcel wrote:

we have the same problem and we want to make a bigger valve true the hull so we hope the water flowws a way a bit faster.
Anyway we still have the same problem.
greetings Marcel
 
 
Yes...bigger hole does not change the pressure balance in the hose....unless you drain to open air, then a bigger hole allows higher volume to escape.Wink
 
Tingeling
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copain View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote copain Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 21:58

Hi Marcel,

As Tingeling tries to explain the balance between the level outside and inside remains the same. Growing the through hull size would only make the volume you would like to discard faster, but how would  you generate a bigger volume in the first place ?? 
 
The balance will not change unless you change the position, and not the size of your through hull valve.
 
Regards, Willem
s/y Copain (Beneteau 281)
from march 2008 Hanse 350 # 061
Visit my BLOG op http://www.wsv-haringvliet.nl/blog/maatje/
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ueitug˛ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ueitug˛ Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2008 at 23:53
As for sink physics, tingeling is absolutely right. However, I noticed that the water flows faster if I close and then re-open the valve. I have no physical explanation for that, but it usually works!

Best,

Michele
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Ueitug˛ - Hanse 400e #310
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