AS AÇÕES DO VENTO

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Course #

Weight CA (lbf)

t-min Erection (in)

t-min Internal Pressure (in)

t-min Seismic (in)

t-min External Pressure (in)

t-actual (in)

1

2965.8306

0.1875

0.1050

0.0410

0

0.3752

2

2965.8306

0.1875

0.0906

0.0334

0

0.3752

3

2470.9985

0.1875

0.0763

0.0257

0

0.3126

4

2470.9985

0.1875

0.0620

0.0181

0

0.3126

5

1976.1665

0.1875

0.0477

0.0105

0

0.2500

6

658.7244

0.1875

0.0334

0.0027

0

0.2500

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TANK DESIGN PARAMETERS

D (Tank diameter) = 12.5328 ft

DL_added (Added dead load) = 0 psf

E (Tank Joinf efficiency) = 0.7

H_shell (Shell height) = 26.2467 ft

Liq_max (Maximum liquid level) = 26.2467 ft

Liq_min (Minimum liquid level) = 0 ft

Lr (Minimum roof live load) = 20.0 psf

Pg (Design pressure) = 4.2641 psi

Pv (Design vaccum) = 0.0 psi

S (Snow load) = 0.0 psf

SG (Specific gravity of content) = 1

T (Design temperature) = 4 degf

T_max_op (Max operating temperature) = 20 degf

T_min (Min design temperature) = 30 degf

V (Design wind velocity) = 125.0 mile/hr

site_ground_motion_input_mode (Site Ground Motion Input Mode) = asce7 mapped ss and s1

water_density (Water Density) = 62.37 lbf/ft^3

wind_method (Wind Method) = api 620 method

Product density

product_density = water_density * SG = 0.0361 * 1 = 0.0361 lbf/in^3

Test pressure API-620 7.18.3.4

Pt = 1.25 * Pg = 1.25 * 4.2641 = 5.3301 psi

API 620 Appendix R applied.

API 620 Appendix L applied.Back

ROOF DESIGN

(Material) = A36

(Knuckle material) = A36

E (Joinf efficiency) = 0.7

Rc (Shell radius) = 6.2664 ft

Rs (Dish radius) = 10.0262 ft

c (Corrosion allowance) = 0 in

density_ins (Insulation Density) = 8 lbf/ft^3

t_act (Actual thickness) = 0.25 in

t_ins (Insulation thickness) = 0 in

t_knuckle (Knuckle actual thickness) = 0.25 in

Material density (density) = 0.2833 lbf/in^3

Maximum allowable tensile stress (Sts) = 16000.0 psi

As per API-620 Table 5-6, Erection Thickness (t_erection) = 0.1875 in

Corroded plates thickness

t_corr = t_act - c = 0.25 - 0 = 0.25 in

Geometry Calculations

Geometries

Description

Variable

Equation

Value

Unit

Angle of radius with vertical

Theta

ARCSIN((Rc / Rs))

38.6822

deg

Angle of radius with horizontal

Alpha

90 - Theta

51.3178

deg

Head height

h_head

Rs - SQRT(((Rs^2) - (Rc^2)))

26.3941

in

Head area

A_head

2