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BGBataller December 8, 2009 2 nd Semester, AY 2009-2010 Seminar Room, ChE Dept, CEAT-UPLB

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CLASSIFICATION ◦ Shop-fabricated Vcap≤23,700 gal ◦ Field erected Vcap> 23,700 gal

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1. Vessels below 500 gallons (1:9 m3) are never more than 85% filled 2. Vessels above 500 gal (1.9 m3) are never more than 90% filled 3. Liquid in quantities less than 1,000 gal (3.8 m3) is stored in vertical tanks mounted on legs

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4. Liquid in quantities between 1,000 and 10,000 gal (3.8 and 38 m3) is stored in horizontal tanks mounted on a concrete foundation 5. Liquid in quantities exceeding 10,000 gal (3.8 m3) is stored in vertical tanks mounted on a concrete foundation.

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Shell Thickness (One – Foot Method) >> Applicable only for the Lower Course Shell Thickness

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Shell Thickness (One – Foot Method) >> Applicable only for the Upper Course Shell Thickness

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Shell Thickness (Variable Point Method) LOWER COURSE THICKNESS

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Shell Thickness (Variable Point Method) UPPER COURSE THICKNESS

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Where:

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Where x is a variable design point that is a function of: a. Thickness of layers b. Tank Radius c. Liquid Height >> is the minimum value among x 1, x 2, x 3

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For Self-Supporting Roofs (FS=4)

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For Long Cylindrical Shell (E=30x10 6, FS=1.5, Poisson’s ratio = 0.3)

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For FS=2 and t b =0.25 to 0.75 in.

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