As Ohiojim said, dry ice is the answer. A chunk or two in the tank is enough to displace all of the flammable gas with CO2, which is not flammable. The second benefit is the vapor is cool, so it keeps temps inside the tank low, which also aids in explosion prevention.
Can't remember who it was Dad talked to years ago that told him this trick, but I do remember the guys repaired railroad tank cars. Dry ice was all those guys ever used and they swore by it for the two reasons listed above.
An additional benefit to dry ice is that when your done, there is no water left in the tank, no residue from any kind of chemical. All that remains is a little bit of C02 vapor.
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