• For portable DOT tank storage, you are
allowed up to 25 gallons total capacity.
You could have up to five 5-gallon (20 lb.)
portable appliance cylinders (the size
usually found on barbecue grills-DOT
4BA240); or one 23 gallon (100 lb.)
cylinder (DOT 4bw240), in storage in an
unattached garage or shed. But, if you
want to store propane and
flammable/combustible liquids together,
they should be separated by at least 10
feet