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Old 15-12-2017, 03:06   #1
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Check-valve for gas and water

Hi!

Got a propane system with a drainage in the bottom of the propane bottle container.

If the bottle leaks, the propane will go out through the hole in the bottom of the container, into a hose, and out through the hull at a lower point.

Works, there was a leak once, all was drained that way.

Thing is, when going hard headwind, sometimes water enters through the hull opening, into the hose and spills out into the bottom of the propane container.

Is there a way to put a check-valve, one-way valve, on the hose so gas can get out, but water not in?

If it was water going in both directions, it would be simpler, wouldn't it? Will the gas be able to open the valve? Will the pressure of the gas be strong enough?

There might be different kinds of valves, perhaps some of them can do the job?
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Old 15-12-2017, 04:43   #2
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Re: Check-valve for gas and water

A bronze check valve near the thru hull will stop water and if it's near vertical the check valve will be normally open, so gas would pass. If installed so the valve flapper is closed the gas might not open it because there would be almost no pressure, just the weight of the gas.
One drawback, in the right conditions where waves are hitting the thru hull, the valve flapper will make noise shutting each time.
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Old 15-12-2017, 04:53   #3
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Re: Check-valve for gas and water

Just put a clamshell over the outlet, with the opening facing aft. Water will not enter, and any gas leakage will be able to pass thru.
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Old 16-12-2017, 10:14   #4
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Re: Check-valve for gas and water

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Just put a clamshell over the outlet, with the opening facing aft. Water will not enter, and any gas leakage will be able to pass thru.
I might go that way.

https://en.wikipedia.org/wiki/Clamshell_(container)

I think I know what it is. I need to laminate it into the hull so.

Cheers

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Old 16-12-2017, 10:40   #5
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Re: Check-valve for gas and water

A heavy bronze flapper valve may not close when mounted vertical. If the water rises abruptly it may close , but when just coming up slow it wont. I'm thinking a cockpit scupper, one of the ones with the floating ball in it, would work if you mounted it in the locker bottom.
What's important is what this statement really means: "Thing is, when going hard headwind, sometimes water enters through the hull opening, into the hose and spills out into the bottom of the propane container."
Is the water coming up into the lock from the amount of heeling? (bottom of locker below water line) or is it driven up from the flow? If driven up, the reverse mounted clam shell scoop may help. If below waterline it wont.
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Old 16-12-2017, 10:56   #6
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Re: Check-valve for gas and water

https://www.ebay.ca/itm/Buck-Algonqu...9aI5RM&vxp=mtr

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Old 16-12-2017, 11:05   #7
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Re: Check-valve for gas and water

Quote:
Originally Posted by Bob666 View Post
I might go that way.

https://en.wikipedia.org/wiki/Clamshell_(container)

I think I know what it is. I need to laminate it into the hull so.

Cheers

Often they are just glued on with polyurethane caulk. Works fine.
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Old 16-12-2017, 11:17   #8
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Re: Check-valve for gas and water

https://www.ebay.com/itm/BOAT-MARINE...ZZUcGr&vxp=mtr
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Old 17-12-2017, 06:19   #9
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Re: Check-valve for gas and water

I think Cheechako has the answer, a cockpit scupper with a ball in it that floats up and blocks water from coming in. When water isn't present, the ball drops down and lets water or propane drain out. There are several on the market.
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Old 17-12-2017, 07:27   #10
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Re: Check-valve for gas and water

Do NOT put any kind of check valve in a propane vent line!
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Old 17-12-2017, 08:44   #11
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Re: Check-valve for gas and water

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Do NOT put any kind of check valve in a propane vent line!
+1

Not only that, but the drain line from the propane locker should never have a low spot that can collect water and prevent very low pressure gas from flowing out of the locker.
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Old 18-12-2017, 05:20   #12
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Re: Check-valve for gas and water

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Originally Posted by Terra Nova View Post
Do NOT put any kind of check valve in a propane vent line!
THIS ^^^^^

Putting a check valve on the propane vent line is a very, VERY bad idea!

(Unless, of course, your plan is to blow up your boat and collect the insurance. Then it is really good way to accomplish your goals.)
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Old 19-12-2017, 08:41   #13
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Re: Check-valve for gas and water

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Originally Posted by denverd0n View Post
THIS ^^^^^

Putting a check valve on the propane vent line is a very, VERY bad idea!

(Unless, of course, your plan is to blow up your boat and collect the insurance. Then it is really good way to accomplish your goals.)
What about the clamshell solution? Also a no-no?

The hose must have its lowest point at the exit through the hull you mean, please?

Then I must drill through the container a bit above its lowest point. There will be a litre or so of gas in the container before it leaks out then.

I cannot put the container any higher.

Albeit this might not adhere to some standards, please advice from the current situation, assuming it is impossible to change it.

“You are crazy, but if you must do that, try this and that”

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Old 19-12-2017, 08:52   #14
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Re: Check-valve for gas and water

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Originally Posted by Bob666 View Post
...The hose must have its lowest point at the exit through the hull you mean, please?

Then I must drill through the container a bit above its lowest point. There will be a litre or so of gas in the container before it leaks out then...
If this is the best you can do hire a pro.
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Old 19-12-2017, 10:18   #15
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Re: Check-valve for gas and water

Quote:
Originally Posted by Bob666 View Post
What about the clamshell solution? Also a no-no?

The hose must have its lowest point at the exit through the hull you mean, please?

Then I must drill through the container a bit above its lowest point. There will be a litre or so of gas in the container before it leaks out then.

I cannot put the container any higher.

Albeit this might not adhere to some standards, please advice from the current situation, assuming it is impossible to change it.

“You are crazy, but if you must do that, try this and that”


You posted this in past :

http://www.cruisersforum.com/forums/...ge-173709.html

The post contained this link:

Gasolförvaring båt - Gasol- och fotogenprodukter

This Swedish LPG guide is similar to UK BSS, & is the common & acceptable guide for EU.

BSS guide : https://www.boatsafetyscheme.org/med...de%20chap7.pdf

ABYC is the guide for North American built boats

All 3 of the guides-SE,BSS & ABYC are very similar regarding the "bucket style" LPG locker with overboard gas drain.

You stated in the old post your plan to build a larger,safe LPG locker.
I assume from this post that you have built the new larger locker & it is all good,except some water splashes up the drain hose & into the locker when pounding into head seas.

My questions:

1. What harm is this water doing?
2. Does the water drain back out as soon as the bow lifts again?
3. Is the drain skin fitting(thru hull) thru the stem or thru the side of hull?

Photos would be helpful.

Len
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