gas bottle box drain to sea without seacock
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Category: Hints & Tips
Forum Name: 411
Forum Description: 411 Hints and Tips
URL: https://www.myhanse.com/forum_posts.asp?TID=8213
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Topic: gas bottle box drain to sea without seacock
Posted By: Jøvani
Subject: gas bottle box drain to sea without seacock
Date Posted: 20 February 2014 at 13:42
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By resent
checking all through hull locations on my 411 I found that the drain to sea from
the gas bottle box did not have a seacock.
The through hull location is well under the waterline. As far as I could see it
is just a ½” or ¾” hose going from the fitting to the box. The gap between the
hull and the gas box is narrow, approximately 100 mm. The through hull fitting
got a 90º bend to get room for the hose.
It might be possible to get a seacock in there, but certainly not
simple.
Has anyone made this modification? Regards Jøvani ------------- Jøvani Hanse 411 #189 Tønsberg Norway |
Replies:
Posted By: Mark&Catherine
Date Posted: 20 February 2014 at 16:59
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I will look at mine tomorrow, never even thought it would be below the waterline, thanks M ------------- 385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine |
Posted By: Lothlorien
Date Posted: 17 June 2014 at 12:56
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Hi Jovani, I have the same situation in my boat (#188  ) and I am thinking placing it at the bow. I have to redo the entire antifouling this winter so I am thinking of finding a new place for this seacock too.Ralf, Lothlorien, NL
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Posted By: iemand
Date Posted: 17 June 2014 at 16:13
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The problem is that the seacock is under the waterline a) you would need a seacock b) if the water covers the thruhull or the seacock would be closed the whole ventilation for the gas box doesn't help. Solution: thru hull above the waterline. BR Thomas ------------- Hanse 312 MJ 2004 - Hanse 370e MJ 2007 |
Posted By: Peter-Blake
Date Posted: 17 June 2014 at 16:39
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I am very surprised that the drain for the gasbox is under the waterline! This is only ok if there is another drain for gas above the waterline. maybe the drain you mention is for water only, so the box can empty after a rainshower. Hanse would never get a CE-Certifcat neither would any yacht get a insurance without a gas drainage above the waterline! So i think there must be another drainage! ------------- Blake 370 
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Posted By: Rubato
Date Posted: 17 June 2014 at 17:26
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Totally agree with P-B, the whole idea of the vent is so that gas can escape. If the vent is below the waterline, no gas is ever going to escape and the vent is no longer effective causing a safety issue. The through hull for this function should not be below the waterline and should not have a seacock. ------------- Steve Hanse 400e, #168 |
Posted By: Mark_J1
Date Posted: 17 June 2014 at 21:14
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So this thread caused me to wonder.....Below waterline would work if propane was soluble in water. After some research I gather it isn't (though propanol is)! Polar propane versus non-polar water molecule but I'll leave the detail for the chemists. Mark ------------- Hanse 400e "Grey Goose" Hull #31 |
Posted By: Bandy
Date Posted: 17 June 2014 at 22:44
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My gas bottle box is in the cockpit (just before the steering wheel) there is no drain, only two openings in the door which allow gas and/or water to escape. Never had any problems with it. ------------- Bandy, Hanse 411 2003 |
Posted By: Peter-Blake
Date Posted: 18 June 2014 at 10:26
That is the standart how it works on many hanses and this seems to be CE conform! And that is ok! The openings in the door of the gas box drain into the cockpit. As the cockpit is open at the end of the boat, the gas can flow outside of the boat. So no problem with it. It would only be a problem if you have a completely closed cockpit without a drain above waterline! ------------- Blake 370
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Bandy wrote:Posted By: Jøvani
Date Posted: 18 June 2014 at 20:11
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The 411 design must be differen. It is a rather large gas box with space for two 5kg. The drain i mention i my comment in February is a water drain, not a gas drain. There are no gas drain. The location of this box is such that gas will not get into the hull, but could remain in the gas box in case of a leakage. May be this clearfy? My concern was the hose from the trough hull to the gas box. I did install a valve to be able to close in case of leakage in the hose. It is just a short hose, but anyway! Regards Jøvani ------------- Jøvani Hanse 411 #189 Tønsberg Norway |
Posted By: holby
Date Posted: 19 June 2014 at 14:25
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I am sure I will be corrected but I was under the impression to get the CE cert, the gas box had to vent to atmosphere, as mine does on the 301.... ------------- Hanse 301, tiller steering, Volvo 2010 (10hp) 
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