SailNet Community - Reply to Topic
Thread: How long (reasonably) does a tank of CNG last? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
12-23-2013 07:14 PM
Re: How long (reasonably) does a tank of CNG last?

I had CNG (Seaward 3 burner w/oven) for a few years in my present boat. Not easy to find in the Caribbean and expensive. Had to pay $60 a tank for empty/full tank swaps in Tortola. A tank might last a month or a little longer using it a couple times a day. Changed the burners to LPG and switched to propane - now able to refill tanks cheaply anywhere in the Caribbean. Flame seems quite a bit hotter, on a four month cruise we averaged 6 weeks on a 10 lb. tank.
12-14-2013 05:11 PM
Re: How long (reasonably) does a tank of CNG last?

During the 13 weeks we lived on the boat last summer we went through 2 1/2 tanks of CNG.
12-14-2013 01:32 PM
Re: How long (reasonably) does a tank of CNG last?

Our tank( Composite) is a little smaller then a 20 and last us 3 to 4 months depending on how much baking the 1st mate does, but I make coffee every morning and a hot meal for dinner every night.
12-14-2013 01:09 PM
Re: How long (reasonably) does a tank of CNG last?

They refer to the smaller CNG bottles (tanks-suba sized) as 20 hour tanks. Meaning, one burner on high (4-5,000btu) will burn for 20 hours.

After 15 seasons, with a family of 4 aboard full time, we'd go through a bottle a week(that would be a lot of cooking).

With just two and light cooking, you should go twice that, maybe more if you don't use an oven.

Exchange is the only option here in Maine, and it's expensive, 60.00 per bottle last season.
12-11-2013 09:33 AM
Re: How long (reasonably) does a tank of CNG last?

I have been using CNG for over 30 years. I used to keep a spare tank on board. But the last tank lasted me two years, mostly do to the lack of a first mate. In the past a tank would last the better part of a year. Weekend sailing and a couple of long weeks sailing. $20.00 to fill at Brothers Corp. I find it is a very hot flame, boiling water twice as fast as home gas. Lighter that air gas is safer because it will not settle in the bilge if there is a leak.

This install was not my doing or was the microwave, I can thank dad for that. He was very safety conscious. These systems have worked well over the years.

The down side is carrying the tank on board, and what others would say BOOM. I don't feel there is any more risk of this happening than with using other gasses or fuel to cook with. And much safer than others. An impact from another boat, rocks or other obstruction is minimal in just the right location is a real long shot. It would have to be a high speed crash and penetrate my 3/4" solid Fiberglas hull. I see that as a non issue.

Happy sailing,
12-11-2013 07:43 AM
Re: How long (reasonably) does a tank of CNG last?

Just an update.

We found that doing coffee in the morning (tea kettle), and a meal at night our tank lasted about 6 weeks.

We scored big time in Vero Beach on the way down the ditch and picked up 2 used tanks (certs are only 3 years old, they are good for ten years) for 10Bucks each!!!!

I'm going to make a mount that will secure all three tanks next to each other in the lazarete.

This solves my where to get gas issue in the Islands, as we will be there for about 3 months.

Thx again to all for the input.

08-28-2013 05:07 PM
Re: How long (reasonably) does a tank of CNG last?

They always run out when you're using them. Carry a full spare.
08-28-2013 02:25 PM
Re: How long (reasonably) does a tank of CNG last?

I can't speak for anyone else, but when I brought my Hunter down from Baltimore to the Keys in 2011 we were cooking at least one meal a day and after four months the CNG tank was still half full when I took it for a re-fill in Jacksonville on the way back up to Georgia(yes, there is a station there -- TECO People's Gas). My tank is old and looks like it came with the boat ... about the size of 50 cu ft. SCUBA tank.

So ... if you go to the Bahamas (where I don't know of any re-fill sites, you'll probably have to refill in either Jacksonville or Miami ....

If you search the Internet you'll find a map that identifies CNG re-fill sites throughout the US ... just do your research because not all of them are public access ....

Hope this helped.
08-27-2013 02:27 PM
Re: How long (reasonably) does a tank of CNG last?

I called around using the above referenced website 'corpbrothers' found a wide range of prices. The best price was through corp brothers. New tank (filled) was 240ish. Shipped to eastern shore 45. So basically 300 bucks to put another tank on the boat. They also charge about 28 for exchange (filling). Prices I got around Maryland were in the 400 plus range on a new tank, and approaching 70 for exchange.

I need to find a place in FL for exchange (southern preferred) to make this all work.

This will get me by a couple of years till I convert over the whole thing to propane.
08-27-2013 01:49 PM
Re: How long (reasonably) does a tank of CNG last?

ok, well then sounds like a month worth. sounds like I should get another tank to give me two months plus worth of gas.

Do you know of anywhere I can purchase another tank? Or how much they generally go for? My existing tank looks like a scuba tank in size.

Thanks for the (relevant) info. Also, thanks to those trying to help as well.

As to the insurance, it was the Seawind guy that supplies the conversion kit that gave me the heads up about the nogo on insurance post conversion.
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

For the best viewing experience please update your browser to Google Chrome