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post #1 of 21 Old 06-22-2012 Thread Starter
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compressed natural gass

Im looking at a boat that has a compressed natural gas stove. I was told that it was becoming more popular and was safer by the broker.

I dont really question that its safer i guess.

Question i have is getting the tank filled. how popular are the stations? I know i can get a propane tank filled pretty much anywhere. It may be the safest thing out there but if you cant get the tank filled it isnt much good.

Thanks for any input.
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post #2 of 21 Old 06-22-2012
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Re: compressed natural gass

cng is quite a bit safer as compared to propane....it is getting more and more difficult to get refills....depending on where in the states you are....

I know you can get "exchanges" at Zanheisers in southern MD....that is the closest to me on the northern neck of VA....else it is several hundred miles by car, if they are open and still in business. Most will not mess with the small tanks we use on the boat....

best of luck, were it me....I would opt for Propane and make sure my locker was correct and all the plumbing and solenoids are tip top.
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post #3 of 21 Old 06-22-2012
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Re: compressed natural gass

I would suggest the CNG is much less popular than LPG.

The big issues are /were:
The tanks cannot be re-filled, they have to be exchanged.
CNG is pretty much only available North America.
The 2000-2500 psi tanks were worrisome.

I have never been on a boat with CNG, I have been on a couple that were converted from CNG to LPG.

LPG is safe if used safely.

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post #4 of 21 Old 06-22-2012 Thread Starter
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How hard is it to convert a cng stove to lp ever done it?
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post #5 of 21 Old 06-22-2012
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Re: compressed natural gass

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Originally Posted by Allen-deckard View Post
How hard is it to convert a cng stove to lp ever done it?
A friend converted his. I believe that all the stove needs is the correct jets. The bigger issue is venting the storage locker. The hoses may need changing out as well. Check out this posting

Converting CNG to LPG

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post #7 of 21 Old 06-22-2012
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Re: compressed natural gass

If you plan on cruising outside of US then definately go with LPG vice CNG. If you have a standard stove then conversion is easy at that end. The other issue is that LPG has a higher heat output as well so more efficient to cook with.
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post #8 of 21 Old 06-23-2012
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Re: compressed natural gass

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The other issue is that LPG has a higher heat output as well so more efficient to cook with.
This is very misleading. The higher heating value for natural gas (methane) is 23,875 Btu/lb. For propane its 21,669 Btu/lb. The issue is the storage density as CNG is a compressed gas while LPG is a liquid in the storage tank.
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post #9 of 21 Old 06-23-2012
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Re: compressed natural gass

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Originally Posted by Allen-deckard View Post
Im looking at a boat that has a compressed natural gas stove. I was told that it was becoming more popular and was safer by the broker.
...and people wonder why brokers are held in contempt... This guy lied to you.

CNG is a natural resource that the USA has in great supply. In the mid '80s and early '90s many boat manufacturers started including CNG systems in their boats because CNG is lighter than air (versus propane which is heavier than air), and therefore, should be safer. And, because they wanted to be ready in case the distribution network ever developed. At one point it was marketed as "Safe gas." T Boone Pickens (http://en.wikipedia.org/wiki/T._Boone_Pickens) has recognized the advantages of CNG over most other fossil fuels, but has not been able to address the "distribution issue."

That issue is that today, there is a spotty distribution network throughout the US, and getting a CNG tank refilled is likely to be a frustrating exercise. And the US has one of the best CNG distribution networks in the world.

- Source:Alternative Fuels and Advanced Vehicles Data Center: Natural Gas Fueling Station Locations

Some people have devised ways to refill their CNG tanks (see an example hereCatalina 34.org/CNG-refill-adapter). Personally, screwing around with ~3K PSI tanks filled with a flammable gas scares me... but that's me.
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Last edited by eherlihy; 06-23-2012 at 11:53 AM. Reason: fixed link
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post #10 of 21 Old 06-23-2012 Thread Starter
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Well the high presure of the flamable gas is not something im concerned with really. I worked as a welder fabricator for 20+ years working with compressed nat ural gas a good chunk of the time because the price of the nat gas was cheeper than alternatives.

With that said if you cant get the tanks filled its a useless setup.

I thought about just replacing the burners keeping the stove and going that route but just havent made up my mind on the lot.
The boat is in excellent condition but ive been going threw the smaller things that all added together to get her comfortable and its around 10k on top of the purchase price so gonna ponder things for awhile and if i miss the sale on it so be it.
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