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gas bottle box drain to sea without seacock |
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Jøvani
Captain Joined: 20 April 2009 Location: Norway Status: Offline Points: 175 |
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Posted: 20 February 2014 at 13:42 |
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 |
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Jøvani Hanse 411 #189
Tønsberg Norway |
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Mark&Catherine
Admiral Joined: 18 January 2013 Location: Turkey Status: Offline Points: 1200 |
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I will look at mine tomorrow, never even thought it would be below the waterline, thanks
M |
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385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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Lothlorien
Sub Lieutenant Joined: 28 December 2012 Location: Bruinisse Status: Offline Points: 3 |
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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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iemand
Admiral Joined: 13 February 2004 Location: Germany Status: Offline Points: 1082 |
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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 |
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Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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Peter-Blake
Admiral of the Fleet Joined: 04 March 2008 Status: Offline Points: 2465 |
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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! |
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Blake 370
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Rubato
Admiral Joined: 12 July 2006 Location: Canada Status: Offline Points: 1791 |
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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.
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Steve
Hanse 400e, #168 |
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Mark_J1
Rear Admiral Joined: 12 March 2013 Location: Dover&Medway UK Status: Offline Points: 526 |
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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
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Hanse 400e "Grey Goose" Hull #31
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Bandy
Lieutenant Commander Joined: 25 May 2004 Location: Holland Status: Offline Points: 77 |
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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.
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Bandy, Hanse 411 2003
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Peter-Blake
Admiral of the Fleet Joined: 04 March 2008 Status: Offline Points: 2465 |
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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! Edited by Peter-Blake - 18 June 2014 at 10:27 |
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Blake 370
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Jøvani
Captain Joined: 20 April 2009 Location: Norway Status: Offline Points: 175 |
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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 |
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Jøvani Hanse 411 #189
Tønsberg Norway |
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