1. Storage Tank Design BGBataller December 14, 2010
2nd Semester, AY
Seminar Room, ChE Dept, CEAT-UPLB

2. Storage Tank CLASSIFICATION Shop-fabricated  Vcap≤23,700 gal
Field erected  Vcap> 23,700 gal

3. Shop-Fabricated Tanks

4. Field Erected Tanks

5. Guidelines on Allowances
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

6. Guidelines on Allowances
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.

7. SHELL DESIGN Shell Thickness (One – Foot Method)
>> Applicable only for the Lower Course Shell Thickness

8. SHELL DESIGN Shell Thickness (One – Foot Method)
>> Applicable only for the Upper Course Shell Thickness

9. SHELL DESIGN Shell Thickness (Variable Point Method)
LOWER COURSE THICKNESS

10. SHELL DESIGN Shell Thickness (Variable Point Method)
UPPER COURSE THICKNESS

11. Shell Design >> Variable Point
Where:

12. Shell Design >> Variable Point
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 x1, x2, x3

14. Roof Thickness
For Self-Supporting Roofs (FS=4)

15. Height between Stiffeners
For Long Cylindrical Shell (E=30x106, FS=1.5, Poisson’s ratio = 0.3)

16. Bottom (annular) Plate Length
For FS=2 and tb=0.25 to 0.75 in.