Scheduling is on as-needed basis. Project management is limited to contractor s daily work permits. . . . Confined air space entry is between 600 and 10,000 manhours. Continuous oxygen, LEL, toxicity monitoring and holewatch is required. . . Confined air space entry is 0 hours for fixed roofs and 4-8 manhours for floating and internal floating roofs. . . .
Alternate storage is a factor. . . .
Need for alternate storage is eliminated. . . Tank has to be degassed and vented. In a tank with 100 ft. diameter, typically the equivalent of 80-120 tons of CO2 is released. . . . Tank air emissions are 0-. . . . . Spot inspections and limited surveys are not cost effective. . .