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quantities less than m3, vacuum insulated tanks are the best option. • There is no doubt, that for storage of quantities larger than 50 m3 flat bottom tanks Missing: evacuating ‎| ‎Must include: ‎evacuating. The thermal performance of this insulation was determined in flat-plate and . attached to the tank, they are evacuated to a very low air pressure and then backfilled .. completely insulated tank with tension bands installed at top and bottom to.