Tank 97 on this web site was of a welded construction measuring 27 ft in diameter and 35 ft excessive. It held 125,000 gallons. Two manhole covers, one on the roof and one at ground stage, have been held shut with metal plates secured by nuts and bolts. This tank had been empty for 2 years but had beforehand held Myrcene (a member of the turpentine family). This chemical would depart a thick, gummy deposit on the within of the tank. This deposit could be simply ignited or when heated would give off a flammable vapour which, if blended with air, is probably explosive.
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