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

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

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

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

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.

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

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

 Shell Thickness (Variable Point Method) LOWER COURSE THICKNESS

 Shell Thickness (Variable Point Method) UPPER COURSE THICKNESS

Where:

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

 For Self-Supporting Roofs (FS=4)

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

 For FS=2 and t b =0.25 to 0.75 in.

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