Does anyone have any info on recertifying a old 1993 CNG tank? I have a specific tank which fits under the settee of my 35.5 and I would like to keep using CNG because it's safer than propane. I don't have a free aft locker to convert for a propane tank. If I could get recertified, I think I can get the fuel locally. Also, do I need an adapter for filling the tank at a CNG vehicle station for city busses and trucks. I was referred to and have emailed "Corp. Brothers" (a Rhode Island area gas and equipment company) and I get no response. Their site shows the same equipment, tank and regulator etc. for marine use. Thanks
CNG stove fuel
- Thread starter JohnCelerity
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Up here its handled as a one for one exchange
So no recertification is necessary. I would think that a local marina should be able to point you in the direction of someone that provides a CNG bottle exchange service. Or, have you tried calling the customer service number from the Corp Brothers site: Main Providence Branch: Telephone: 800-234-1286 They might be able to point you to a local supplier. Good Luck, Ken
So no recertification is necessary. I would think that a local marina should be able to point you in the direction of someone that provides a CNG bottle exchange service. Or, have you tried calling the customer service number from the Corp Brothers site: Main Providence Branch: Telephone: 800-234-1286 They might be able to point you to a local supplier. Good Luck, Ken
Try your local dive shop
Most marina services ofer an exchange service rather the refilling. If you still want to refill the tank try your local scuba diving shop. It might be the same process as cerfifing a dive tank.
Most marina services ofer an exchange service rather the refilling. If you still want to refill the tank try your local scuba diving shop. It might be the same process as cerfifing a dive tank.
After re-reading the post...
...I now understand your original question. It sounds like you need to hydrostatically test the tank, correct? The last certification date is "stamped" into the neck of the cylinder. A local dive shop may be able to send it out for you. (A dive shop because a CNG tank is the same metal alloy/ size as a SCUBA tank, but a different valve). But find out where they will send it and save a few bucks if you want to take it yourself. They will stick it in a water tank and fill it to 4/3 of the capacity and check the water guage to see how much the water expands. If it is too much, it will fail the test and they will drill a hole into the neck of the tank and render it useless (a good thing). If it passed, they will stamp the new date into the neck. OR...if you can just swap the tank at a CNG dealer, they will assume that responsibility. Good Luck!
...I now understand your original question. It sounds like you need to hydrostatically test the tank, correct? The last certification date is "stamped" into the neck of the cylinder. A local dive shop may be able to send it out for you. (A dive shop because a CNG tank is the same metal alloy/ size as a SCUBA tank, but a different valve). But find out where they will send it and save a few bucks if you want to take it yourself. They will stick it in a water tank and fill it to 4/3 of the capacity and check the water guage to see how much the water expands. If it is too much, it will fail the test and they will drill a hole into the neck of the tank and render it useless (a good thing). If it passed, they will stamp the new date into the neck. OR...if you can just swap the tank at a CNG dealer, they will assume that responsibility. Good Luck!
Usually done as an Exchange
Usually they exchange an empty tank for a full one. To the second question, do you need an adapter the answer is yes, the vehicle CNG is at much higher pressure than the tanks for the boats are able to withstand.
Usually they exchange an empty tank for a full one. To the second question, do you need an adapter the answer is yes, the vehicle CNG is at much higher pressure than the tanks for the boats are able to withstand.
Ditto on the Dive shop
I have a '92 35.5 and also have chosen to stay with CNG. I took my tank to a local dive shop for testing/certification. I think it was about a week turnaround and only like $25 or so, if I remember correctly. The biggest issue that I have is finding a local convenient supplier. Closest is about an hour. T J
I have a '92 35.5 and also have chosen to stay with CNG. I took my tank to a local dive shop for testing/certification. I think it was about a week turnaround and only like $25 or so, if I remember correctly. The biggest issue that I have is finding a local convenient supplier. Closest is about an hour. T J
Problem Solved & thanks!
Just when I said I couldn't get info from Corp. Brothers in Providence, RI, they called. I had an old number that rang but was not being answered! Anyway, you guys were right, it's an exchange - empty for full. If you want a brand new tank, it's $216 (full). They also have the adapter for high pressure vehicle stations. Shipping from RI to NC for 35 lb. is approx. twenty bucks. Now I'll have an updated tank and can refill locally. Not too many dive shops in the mountains of western NC. Mighta-coulda done it closer, but this works. Thank you all for responses and help.
Just when I said I couldn't get info from Corp. Brothers in Providence, RI, they called. I had an old number that rang but was not being answered! Anyway, you guys were right, it's an exchange - empty for full. If you want a brand new tank, it's $216 (full). They also have the adapter for high pressure vehicle stations. Shipping from RI to NC for 35 lb. is approx. twenty bucks. Now I'll have an updated tank and can refill locally. Not too many dive shops in the mountains of western NC. Mighta-coulda done it closer, but this works. Thank you all for responses and help.
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