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Old 24 October 2016, 06:11   #11
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Country: Ireland
Town: Donegal Bay
Make: ribtec
Length: 6m +
Engine: outboard 200hp
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Originally Posted by willk View Post
I'm sure you've had a bad run of luck with tanks. I've seen you post variations on this theme - that ALL steel tanks fail eventually. I suppose taken literally, it would be true - everything fails eventually - just as the hull will too. So I'm interested in the timescale you have in mind? 5 - 10 - 15 years? I know LOTS of 15 yo RIBS that are on their original tanks and only two that aren't. One was very badly abused and I have no history on the other. So maybe you're thinking of older craft?

To the OP:

300L is a HUGE amount of fuel in a 6.5m RIB - way more than most users would require or wish to pay for building storage for! The long range tank in a 7.4m Stormforce is 300L ! It sounds like a special order in a Ribtec - maybe for a "Round Somewhere" style trip? The upside is you will NEVER run out of fuel, so long as you don't get complacent about refilling. The downside is that you have a lot of fuel aging below deck. Fuel that you have to get on the plane every time you pull away. Fuel that your engine is running a little harder to carry about. Unless you part fill them?


P.S. Hello from a bit further North East...
Hi
Yes it is a lot of fuel but only when the both tanks are full. I was told that the boat was a stand-by boat for reporters of the camel trophy race.
I normally fill the back tank and keep a 50l reserve in the front tank. Then mid season I will reverse the procedure and fill the front tank and keep a reserve in the back tank.
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Old 24 October 2016, 06:27   #12
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Country: Ireland
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Originally Posted by gtflash View Post
Large tanks built in are great if you need them. Even better is separate or multiple tanks that can be isolated in the event of damage or contamination

The down side with manufactures filling every space with tanks is, if they fail or if they get filled with stuff they shouldn't it could then potentially be a drama to rectify, unless they have easy drain and cleaning facilities. My job is fixing things and when manufactures make any item without a way to service it, because it's" maintenance free" I can guarantee it will be harder to fix later.

The other down side to big tanks is the storage of lots of fuel which degrades and could collect condensation, and closer to my interest is weight Each litre of fuel ways approx 1kg. That's more weight to drag, and more importantly less speed. My mates 25ft boat gained nearly 20mph by loosing weight. He weighed all 600kg he removed on his wife's bathroom scales too
Hi
Every day use the tanks would be nowhere full but for long trips whether the fuel is stored in containers on the deck or in tanks in the hull the weight will be the same.
I take the point about condensation but I have the boat for 9 years and it has not been an issue so far. I do have 1 of the old Yamahas that run on a mixture of petrol/oil/water/sand and rubber
The point regarding access is very valid. It appears on all boats there is very limited(or no) access to service/clean out tanks. Surely this should be made a priority. I mean we pay large sums for chartplotters, suspension seats, a frames etc but it appears very little thought goes to servicing a very important part of the boat
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Old 24 October 2016, 08:09   #13
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Make: Redbay Boats
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Originally Posted by Ribtec1 View Post
a frames etc but it appears very little thought goes to servicing a very important part of the boat
There should generally be an access plate built around the sender unit. This can be removed and the back of the tank inspected/pumped. Bear in mind that any decent tank will be baffled and there is only very limited access to those parts, no matter where your tank is situated.
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Old 24 October 2016, 08:35   #14
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Originally Posted by willk View Post
300L is a HUGE amount of fuel in a 6.5m RIB - way more than most users would require or wish to pay for building storage for! The long range tank in a 7.4m Stormforce is 300L ! It sounds like a special order in a Ribtec - maybe for a "Round Somewhere" style trip? The upside is you will NEVER run out of fuel, so long as you don't get complacent about refilling. The downside is that you have a lot of fuel aging below deck. Fuel that you have to get on the plane every time you pull away. Fuel that your engine is running a little harder to carry about. Unless you part fill them?
That's a pretty common amount of fuel for a boat that size in the USA.

Kinda funny too... The Zodiac Pro Open 650 actually has two tank capacities. The French non-EPA tank has a 31 gallon (120L) capacity. The EPA tank is bigger, at 53 gallons (200L).


People here want to run out 30 - 50 miles, and back, and still have their 1/3 reserve.
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Old 24 October 2016, 08:49   #15
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People here want to run out 30 - 50 miles, and back, and still have their 1/3 reserve.
Which is compatible with a 200L (53USG) tank. 300L (79 US gallons) in a 6.5m boat is most unusual here - I was confident it was a special order
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