Originally Posted by Zac808
I am getting ready to purchase a xfer tank arounr 50 gallons. Any reason to buy aluminum over steel, beside weight and corrosion? Steel tanks are significantly cheaper.
"IF" an aluminum tank is built and mounted properly it will outlast (not out perform) a steel tank.
Steel tanks that I've seen fail are due to a lack of paint or there was no way to remove the water from inside of the tank.
There maybe more condensation with aluminum.
I work with aluminum allot so for me aluminum is the way to go but in saying that I've seen ALLOT of really cheap poorly made aluminum tanks that only last 6-8 years.
A rule of thumb is that aluminum is 1/3 the weight of steel and 1/2 the strength. If a steel tank is say .063" thick for the same strength an aluminum tank should be .125" and still be 1/4 less weight.......1/4 because extra reinforcing is needed on an aluminum tank.
I wouldn't buy a tank made with less than 1/8" aluminum.
It is important to use a marine grade aluminum like 5052 or 5086.
Super-brite aluminum checker plate can be 3003 grade
Aluminum will corrode if it is mounted to a flat surface that traps moisture against the tank.
Galvanized steel tanks and fittings are bad news for diesel.
If I was building a 50 gal alum. tank for myself I would use either 5/32" or 3/16" aluminum.