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S&S Swan Maintenance - Vent for gas bottle storage
10 April 2013 - 21:51
#1
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chrisblum
Join Date: 27 January 2011
Posts: 166

Vent for gas bottle storage
A hole at the bottom of the aluminum gas bottle storage on our boat indicates that there was at some point a line or hose that would evacuate the gas in case of a leak. I did not find any indication to which other end and that hose would connect to, and how the gas would be evacuated to the outside. Does anybody know?

Christian IF 411/028

10 April 2013 - 22:20
#2
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robmably
Join Date: 01 March 2007
Posts: 148

Hi Chris,

I have the same canister in the lazarette under the helm seat. We have a flexible hose connected to a through hull fitting above the waterline ( just above the boot top from memory)

This should allow any liquid gas to exit the hull and not go into the bilge.

Kind regards

Rob.

Sarabande 47/29
10 April 2013 - 22:36
#3
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matteosalamon
Join Date: 29 January 2007
Posts: 1145

Dear Christian

here you are!

Fair winds!

matteo (38/067 Only You)
11 April 2013 - 13:14
#4
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danielefua
Join Date: 30 January 2007
Posts: 467

Hello Chris,
I confirm the above replies also for our 411. There should be a thru-hull very close to the bottom of the canister and above the waterline. It is a very important item for safety reasons although inconvenient in some situations. In particular in my case, when extremely heeled, it lets some water enter the canister from below; in this case the important issue is to have the hose as short as possible and without loops or kinks. I do not think that a check valve is recommended but I appreciate advice.

Daniele, 411/004
11 April 2013 - 19:23
#5
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chrisblum
Join Date: 27 January 2011
Posts: 166

Thank you Rob, Matteo and Daniel. I now know what to look for (but I fear to find that the hull opening has disappeared during a previous refit...)

Christian IF 411/028
12 April 2013 - 12:21
#6
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the professor
Join Date: 02 January 2008
Posts: 1547

Dear Christian
According to present LPG regulations there should be one drain downwards for the gas fractions heavier than air, and one upwards for the fractions lighter than air. The downward line to terminate above the static water line, and to slope downwards.
The drains should go to the outside of the yacht, and particular attention be paid to preventing leaking gas from entering the interior of the yacht.

In case you have the possibility to use CNG compressed natural gas lighter than air the downward drain could possibly be omitted. This gas is safer as in case of a leak it dissipates and does not accumulate in low areas
Kind regards
Lars
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