Secondary containment of above-ground tanks for flammable materials

An above-ground secondary containment system for safely and legally holding liquids which ahve explosive vapors comprising:

• a) a closed tank and a dike surrounding said tank;
• b) a hood over said dike for containing vapors from liquid spilled or leaked from said tank;
• and
• c) a closable tank port access means in said hood for permitting access to a tank input port when desired but closable to maintain said hood's property of containing vapors at other times and communicating with said dike so that spilled liquid adjacent said tank input port may be directed to said dike.

An above-ground secondary containment system comprising:

• a) a closed tank suitable for holding liquid and having an input port in an upper portion thereof,
• b) a dike surrounding said tank,
• c) a hood over said dike for preventing ambient precipitation and trash from entering said dike, and having an input port in an upper portion thereof, and
• d) a double-walled pipe including an inner wall pipe connected to said input port in said closed tank and an outer wall pipe having said inner wall pipe within it and being connected to said input port in said hood, so that leaks in said inner wall pipe are contained within said outer wall pipe, said hood or said dike.