27 seamaster option for Monel fuel tank

[Jeff79Sceptre]

I was wondering why no one uses Monel for a fuel tank? My grandfather worked at a paper mill and brought a 55 gallon drum home once. I know for a fact it lasted 20+ years without rusting at ALL. We used it to burn fires in and it makes stainless look like sheet metal. Probably works too well......unlike the government!

[Bushwacker]

Two words . . . WEIGHT & COST! Monel is primarily Nickle, which is much heavier (and more expensive) than steel, not to mention aluminum. You're right in that nothing beats the nickle based alloys for corrosion resistance, but aluminum works just fine for a fuel tank if you install it right so air can circulate around it. I'm amazed at how many boats have foam around the fuel tank, which is the worst possible thing you can do to an aluminum tank, since it holds water against the tank, greatly accelerating corrosion!

[flyingfrizzle]

I done some work in a Silicon tetrafluoride plant and ran a bunch of monel tubing. Silicon tetrafluoride is extremely corrosive and the lines were very high pressure as well. Monel was the best metal that would hold up to the pressure and corrosiveness of that gas made in the plant. The cost was crazy high for the monel tube piping. It was 10x the cost of 316L stainless. Also the weight of the material was very heavy as well. A tank made from it would last forever but would be heavy. I dont even want to think about how much it would cost to have one made in it.