Tank shell fit for purpose calculations

Company Hydrotestic test conditionsWater density r kg/l 1.00

Tank Id Filling height h m 12.80

Design code Course Course Product Minimum Allowable Joint calc. Installed measured Minimal Integrity

Shell Material No. height height Yield Stress Efficiency t thickness thickness thickness check

Y factor Factor incl. CA per DEP

Tank diameter D m 24.40 [m] [m] [ N/mm2] k [mm] [mm] [mm] [mm]

Tank height H m 13.20

Design pressure mbar 20.00

No. shell courses 7

top 7 1.89 1.49 210 0.667 1.00 1.19 6.00 6.00 3.00 OK

6 1.89 3.37 210 0.667 1.00 2.80 6.00 6.00 3.00 OK

5 1.89 5.26 210 0.667 1.00 4.41 6.00 6.00 4.41 OK

4 1.89 7.14 210 0.667 1.00 6.02 7.00 7.00 6.02 OK

3 1.89 9.03 210 0.667 1.00 7.62 8.00 8.00 7.62 OK

2 1.89 10.91 210 0.667 1.00 9.23 10.00 10.00 9.23 OK

bottom 1 1.89 12.80 210 0.667 1.00 10.84 11.00 11.00 10.84 OK

13.20

Product conditions: Product density r kg/l 0.75

Max fill height h m 12.80

Course Course Product Minimum Allowable Joint calc. Installed measured Minimal Integrity

No. height height Yield Stress Efficiency t thickness thickness thickness check

Y factor Factor incl. CA per DEP

[m] [m] [ N/mm2] k [mm] [mm] [mm] [mm]

top 7 1.89 1.49 210 0.67 1.00 0.93 6.0 6.0 3.00 OK

6 1.89 3.37 210 0.67 1.00 2.14 6.0 6.0 3.00 OK

5 1.89 5.26 210 0.67 1.00 3.35 6.0 6.0 3.35 OK

k=0.67 (new) or 0.8(fit for purpose) 4 1.89 7.14 210 0.67 1.00 4.55 7.0 7.0 4.55 OK

3 1.89 9.03 210 0.67 1.00 5.76 8.0 8.0 5.76 OK

2 1.89 10.91 210 0.67 1.00 6.97 10.0 10.0 6.97 OK

bottom 1 1.89 12.80 210 0.67 1.00 8.18 11.0 11.0 8.18 OK

Pd

The following formula is used in calculating the required minimal thickness of shell courses:

S = maximum allowable stress in N/mm2 (see 5.7)E = joint efficiency factorH = height from the lower edge of the course under consideration to the top of the shell in metresD = nominal diameter of tank in metresp = design pressure in mbar (ga)CA = corrosion allowance in mm (for special cases only, to be specified in requisition; normally zero)w = maximum density of product to be stored in g/ml (a value of 1.00 shall be used even where the product to be stored is lighter)

CAphES

Dt

D

)3.0.(.98..20min r

Compression Ring calculations T52Calculation for compression area as required (BS2654, section 8.5.2) :

Tank diameter D m 24.40Tank radius R m 12.20Tank height H m 13.20Design pressure p mbar 20.00Design windspeed Vw m/s 45.00

Allowable compressive stress 120.00 unless other wise specified

Roofplate thickness (annular) mm 5.00SG(density) of steel r kg/m3 7850.00deadload roof plates L mbar 3.93 kg/m2 39.25

Roof slope slope degr 11.30 slope 1:5

Required compression area 4989 , with p less roof weight

Calculation for section area as avaialble :

WT Roofplates mm 5.00 Wh = 335 mm

WT Top Course mm 6.00 Wc = 162 mm

Radius of roof curvature m 62.27

Area D (Roof Wh) 1674

TopCurb Angle b h WT

Area of angle 1 150 150 10 2900 approx.

Area of angle 2 0

Area C (shell Wc) 974

5548

Conclusion : Aa>Ar, L-Profile is OK!

Maximum internal pressureMaximum design pressure Pd mbar 24.5 See API650, section F.4.1.

Sc N/mm2

tr

Ar mm2

tr

ts

R2

AD mm2

AT1 mm2

AT1 mm2

AC mm2

Available compression area (Aac=AD+An+AC) Aa mm2

)(.

..50 2

TANS

RpA

C

R oofslope 1 :5

Wc

Top C urb 1

Top C urb 2

R adiusW T shell

Wind Load Condition

see BS2654, section 7.3.2.7Tank diameter D m 24.40 Design vacuumTank height H m 13.20

design wind speed m/s 45.00

design vacuum mbar 6.00Calc. Factor K - 8.883

Top course thickness-CA m 6.00

Course Course Course Cummel.

No. height thickness Transposed

t [mm] [m] width [m]

top

7 1.89 6.00 1.89 8.806 1.89 6.00 1.89 6.915 1.89 6.00 1.89 5.034 1.89 7.00 1.28 3.143 1.89 8.00 0.92 1.862 1.89 10.00 0.53 0.94

bottom 1 1.89 11.00 0.41 0.41sum(transposed) 8.80 HE

Max permitted spacing (unstiffed) 6.499 Hp (H1)Min. No. of secondary wind girders required 1.00

No. of windgirders installed 2 OK!

(mm)

48 > D 200 x 100 x 12

DEP 70.51.10.11-Gen.Use for Va: 2.5 mbar (ga) for non-pressure fixed roof tanks; 5.0 mbar (ga) for open top floating roof tanks; 6.0 mbar (ga) for low and high pressure fixed roof tanks / BS2654, section 7.3.2.6 Use for Va: 5 mbar (ga) for non-pressure; 8.5 mbar for other

Vw

Va

tmin

He

hc[m]

Other shapes with equivalent section modulus may be used. The section modulus may include a portion of the shell for a distance of 16 times shell plate thickness above and below the stiffener.

Tank diameter (m)

MIN Stiffener size

D £ 20 100 x 65 x 820 < D £ 36 125 x 75 x 8 36 < D £ 48 150 x 90 x 10

H e=hcourse √( tmint )5

H E=∑ H e

K=950003 .563V

w2+580va

H p=K √( tmin5D3 )

Tank Venting Calculations API2000

Data Given : metric U.S.Diameter 7.6 m 25 ftHeight 7.6 m 25.0 ft

Tank capacity 347 2185 barrelsCode Low Pressure Low PressureDesign pressure 20 mbar 8.03 inch w.c.Design vacuum 6 mbar 2.41 inch w.c.

Flash point product 176 349

Max pump-in rate 80 503 barrels/h

Max pump-out rate 20 126 barrels/h

Tank insulated ? N NHot Climate no noInsulation thicknes 0 mm 0 inchEnvironmental factor 1

Wetted area 182 1964 ftSCFH = Standard Cubic Feet of air per Hour

Required venting capacity for normal pressure relief due to pumping-inRequired capacity= (6xSCFH )x(Max pump-in rate)Required capacity= 3018 SCFH

Required venting capacity for normal pressure relief due to thermal outbreathing

Required capacity= 1312 SCFH air

Total required normal pressure relief capacity= 3018 + 1312 = 4330 SCFH air

123

Required venting capacity for normal vacuum relief due to pumping-outRequired capacity= (5.6 SCFH)x(Max pump-out rate)Required capacity= 704 SCFH

Required venting capacity for normal vacuum relief due to thermal inbreathingsee table II-collumn 2 of API2000, 2.4.2

Required capacity= 2185 SCFH airCorrection for climate 2185 if applicable

Total required normal vacuum relief capacity= 704 + 2185 = 2890 SCFH air

82

(3) Emergency ventingEmergency venting required in accordance with API 2000, section 4.3.3.2, Table 3

Required capacity Q= -3809-134194 SCFH air

m3

oC oF

m3/hour

m3/hour

m2

(1) Normal outbreathing (Pressure relief) requirements:

see table II-collumn 3 of API2000, 2.4.2 for product with flash point >100oF (INTERMEZZO-I)

m3/hour

(2) Normal inbreathing (Vacuum relief) requirements:

m3/hour

m3/hour (incl. the environmental factor)

Tank Venting Calculations API2000

Data Given : metric U.S.Diameter 24.0 m 79 ftHeight 14.5 m 47.4 ft

Tank capacity 6537 41111 barrelsCode Low Pressure Low PressureDesign pressure 20 mbar 8.03 inch w.c.Design vacuum 6 mbar 2.41 inch w.c.

Flash point product -40 -40

Max pump-in rate 900 5659 barrels/h

Max pump-out rate 900 5659 barrels/h

Tank insulated ? N NHot Climate no noInsulation thicknes 0 mm 0 inchEnvironmental factor 1

Wetted area 689 7419 ftSCFH = Standard Cubic Feet of air per Hour

Required venting capacity for normal pressure relief due to pumping-inRequired capacity= (12xSCFH )x(Max pump-in rate)Required capacity= 67914 SCFH

Required venting capacity for normal pressure relief due to thermal outbreathing

Required capacity= 34926 SCFH air

Total required normal pressure relief capacity= 67914 + 34926 = 102840 SCFH air

2919

Required venting capacity for normal vacuum relief due to pumping-outRequired capacity= (5.6 SCFH)x(Max pump-out rate)Required capacity= 31693 SCFH

Required venting capacity for normal vacuum relief due to thermal inbreathingsee table II-collumn 2 of API2000, 2.4.2

Required capacity= 34926 SCFH airCorrection for climate 34926 if applicable

Total required normal vacuum relief capacity= 31693 + 34926 = 66619 SCFH air

1891

(3) Emergency ventingEmergency venting required in accordance with API 2000, section 4.3.3.2, Table 3

Required capacity Q= 19910701353 SCFH air

m3

oC oF

m3/hour

m3/hour

m2

(1) Normal outbreathing (Pressure relief) requirements:

see table II-collumn 3 of API2000, 2.4.2 for product with flash point >100oF (INTERMEZZO-I)

m3/hour

(2) Normal inbreathing (Vacuum relief) requirements:

m3/hour

m3/hour (incl. the environmental factor)