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Old 27 January 2014, 12:32   #31
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Do the analog gauges come off of the Maretron in the diagram?
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Old 27 January 2014, 12:47   #32
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They come off the CANdrive which also provides alarms.

CANdrive | Murphy by Enovation Controls
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Old 28 January 2014, 12:35   #33
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Existing 34 gallon tank pulled.

I haven't seen it but apparently it is monumentally heavy. 3/8" solid alum deck plate.

We are exploring two options.

#1 ATL Custom fuel cell that fills this space.

#2 Integral tank glassed into hull.

Shooting for 70 gallons which gives the boat @200 nautical mile range.

If anyone has experience with the ATL tanks please let me know. I know aluminum is probably the least expensive option but not very interested in another alum tank in this space.

ATL tank would look something like rendering below. Fuel send / return and fill on bulkhead going into engine compartment. Diesel this is allowed I believe. Vent and fuel sender on top. Cutout at bottom with bilge water.
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Old 28 January 2014, 16:56   #34
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Quote:
Originally Posted by clloyd View Post
I know aluminum is probably the least expensive option but not very interested in another alum tank in this space.
What are the negatives that are steering you away from aluminum?
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Old 28 January 2014, 22:33   #35
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It's a good question. I guess I had a previous rib that had alum tank in the bilge and it lasted only a few years.

The original tank design hangs the tank from a very thick alum deck plate and the tank itself is burly to be able to just hang there. The benefit is that the tank is not sitting in water in the bilge which is what kills aluminum tanks quick.

So to go back to aluminum, the hanging design would have to be even burlier to support 70 gallons, maybe not a good idea. I wonder why the Navy chose 34 gallons for this design. Seems so small.

So to go alum again I need to put the tank in the bilge, maybe supported up a bit on a platform, but basically sitting down there. Would still need to deal with supporting it, strapping it down, and then also still need to have a deck plate.

The ATL bladders can completely fill the space (fully supported) without corrosion problems. They are well baffled, very flexible (alum you are limited by the deck flange size) and a drop in solution, and also light.

Then we have the integral tank solution. The space is perfect for it. Lot of labor and care to get it right. Burly and maximizes volume. Done right it would be really nice.

Not cheap unless I do it myself and that ship has sailed. All the pieces are going in and I need a tank.

So basically, I've done as much prep as I can but now I don't really have time to make this an art project that I do myself.

ATL and Integral are on the table now.
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Old 28 January 2014, 22:35   #36
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Here's the space cleaned up properly
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Old 29 January 2014, 10:00   #37
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The old Cummins 6bt 210 engine had a fairly small exhaust that exited out a hood on starboard side of Konrad 520 transom plate. You can see it on the photos.

This is not large enough to support a Cummins QSB 330hp which needs minimum of 5" exhaust. The solution is to add a new exhaust port next to the transom plate, then create a y inside the boat and use both the old and new ports as a dual exhaust. The water might tend to favor the lower port, hooded, but either way it doesn't matter.

Progress on the new exhaust. BTW, all this final fit work is being done by Seaboard Marine and exhaust design is their specialty.
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Old 29 January 2014, 14:09   #38
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Looks really nice!!! That is their specialty.
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Old 29 January 2014, 20:25   #39
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Thx,

Alright we are going integral. I'm sure there will be some interesting pictures to follow.

ATL was a good price but it still needs some custom work and fitting, so in the end the integral makes sense and is by far the easiest to maintain.
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Old 03 February 2014, 20:21   #40
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Some progress.

Exhaust is now simpler. Instead of using both outlets, old one is sealed and new one is a straight shot out the back.


Integral tank prepped for glassing. Note the fiberglass half tube stubbed in that provides bilge water pass thru.
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