API2000 Tank Venting Calcs [PDF]

Zitiervorschau

Tank shell fit for purpose calculations Company

Hydrotestic test conditionsWater density

Tank Id Design code Shell Material Tank diameter Tank height Design pressure No. shell courses

Filling height

D H Pd

m m

24.40 13.20

mbar

20.00 7 top

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

t m in

bottom

Course

Product

No.

height

height

Minimum Allowable

kg/l

1.00

m

12.80

Joint

calc.

Installed

measured

Minimal

Integrity

Yield

Stress

Efficiency

t

thickness

thickness

thickness

check

Y

factor

Factor

incl. CA

[m]

[m]

[ N/mm2]

k

7

1.89

1.49

210

0.667

6 5

1.89 1.89

3.37 5.26

210 210

0.667 0.667

4 3

1.89 1.89

7.14 9.03

210 210

2 1

1.89 1.89

10.91 12.80

210 210

per DEP

[mm]

[mm]

[mm]

[mm]

1.00

1.19

6.00

6.00

3.00

OK

1.00 1.00

2.80 4.41

6.00 6.00

6.00 6.00

3.00 4.41

OK OK

0.667 0.667

1.00 1.00

6.02 7.62

7.00 8.00

7.00 8.00

6.02 7.62

OK OK

0.667 0.667

1.00 1.00

9.23 10.84

10.00 11.00

10.00 11.00

9.23 10.84

OK OK

r h

kg/l

0.75

m

12.80

13.20

D  98 .r .( h  0.3)  p   CA  20 .S D .E

S = maximum allowable stress in N/mm2 (see 5.7) E = joint efficiency factor H = height from the lower edge of the course under consideration to the top of the shell in metres D = nominal diameter of tank in metres p = 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)

Course

r h

Product conditions:

Product density Max fill height

top

k=0.67 (new) or 0.8(fit for purpose)

bottom

Course

Course

Product

No.

height

height

Minimum Allowable

Joint

calc.

Installed

measured

Minimal

Integrity

Yield

Stress

Efficiency

t

thickness

thickness

thickness

check

Y

factor

Factor

incl. CA

[m]

[m]

[ N/mm2]

k

7 6

1.89 1.89

1.49 3.37

210 210

0.67 0.67

5 4 3

1.89 1.89 1.89

5.26 7.14 9.03

210 210 210

2 1

1.89 1.89

10.91 12.80

210 210

per DEP

[mm]

[mm]

[mm]

[mm]

1.00 1.00

0.93 2.14

6.0 6.0

6.0 6.0

3.00 3.00

OK OK

0.67 0.67 0.67

1.00 1.00 1.00

3.35 4.55 5.76

6.0 7.0 8.0

6.0 7.0 8.0

3.35 4.55 5.76

OK OK

0.67 0.67

1.00 1.00

6.97 8.18

10.0 11.0

10.0 11.0

6.97 8.18

OK OK OK

Compression Ring calculations Calculation for compression area as required (BS2654, section 8.5.2) : Tank diameter D m Tank radius R m Tank height H m Design pressure p mbar Design windspeed Vw m/s

T52

24.40 12.20 13.20 20.00 45.00

Allowable compressive stress

Sc

N/mm2

120.00

Roofplate thickness (annular) SG(density) of steel deadload roof plates

tr r L

mm kg/m3 mbar

5.00 7850.00 3.93

kg/m2

slope

degr

11.30

slope 1:5

Ar

mm2

4989

tr ts

mm

5.00

Wh =

335

mm

6.00 62.27

Wc =

162

mm

1674

Roof slope Required compression area

Calculation for section area as avaialble : WT Roofplates WT Top Course Radius of roof curvature

R2

mm m

Area D (Roof Wh)

AD

mm2

unless other wise specified

A

39.25

50. p.R 2 S C .TAN ( )

, with p less roof weight

T o p C u rb 1

R o o f s lo p e 1 : 5

b

h

WT

Area of angle 1

150

150

10

Area of angle 2 Area C (shell Wc) Available compression area (Aac=AD+An+AC) Conclusion :

AT1

mm2

2900

AT1

mm2

0

AC

mm2

974

Aa

mm2

5548

approx.

T o p C u rb 2

R a d iu s

Aa>Ar, L-Profile is OK!

Maximum internal pressure Maximum design pressure

Wc

TopCurb Angle

Pd

W T

mbar

24.5

s h e ll

See API650, section F.4.1.

Wind Load Condition see BS2654, section 7.3.2.7 Tank diameter Tank height

D H Vw

design wind speed design vacuum Calc. Factor Top course thickness-CA

H e=hcourse

Va K tmin

√(

t min t

m m

24.40 13.20

m/s mbar m

45.00 6.00 8.883 6.00

95000 3 .563 V

H p =K

√(

t

w

)

D

Course

Course

No.

height hc[m]

thickness t [mm]

7 6 5 4 3 2 1

1.89 6.00 1.89 6.00 1.89 6.00 1.89 7.00 1.89 8.00 1.89 10.00 bottom 1.89 11.00 sum(transposed) Max permitted spacing (unstiffed) Min. No. of secondary wind girders required

)

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.

Course

He

Cummel. Transposed

[m]

width [m]

1.89 1.89 1.89 1.28 0.92 0.53 0.41 8.80 6.499 1.00

8.80 6.91 5.03 3.14 1.86 0.94 0.41

top

2 +580 v a

5 min 3

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

5

H E =∑ H e K=

Design vacuum

No. of windgirders installed Tank diameter (m)

MIN Stiffener size (mm)

D £ 20 20 < D £ 36 36 < D £ 48 48 > D

100 x 65 x 8 125 x 75 x 8 150 x 90 x 10 200 x 100 x 12

2

HE Hp (H1)

OK!

Tank Venting Calculations API2000 Data Given : Diameter Height Tank capacity Code Design pressure Design vacuum Flash point product Max pump-in rate Max pump-out rate Tank insulated ? Hot Climate Insulation thicknes Environmental factor

Wetted area

metric

U.S.

7.6 7.6 347 Low 20 6 176 80 20 N no 0

m m m3 Pressure mbar mbar o C m3/hour m3/hour

182

m2

mm

25 25.0 2185 Low 8.03 2.41 349 503 126 N no 0 1 1964

ft ft barrels Pressure inch w.c. inch w.c. o F barrels/h barrels/h

inch ft

SCFH = Standard Cubic Feet of air per Hour

(1) Normal outbreathing (Pressure relief) requirements: Required venting capacity for normal pressure relief due to pumping-in Required capacity= (6xSCFH )x(Max pump-in rate) Required capacity= 3018 SCFH Required venting capacity for normal pressure relief due to thermal outbreathing see table II-collumn 3 of API2000, 2.4.2 for product with flash point >100 oF (INTERMEZZO-I) Required capacity= 1312 SCFH air Total required normal pressure relief capacity = 3018

+

1312

=

4330 123

SCFH air m3/hour

(2) Normal inbreathing (Vacuum relief) requirements: Required venting capacity for normal vacuum relief due to pumping-out Required capacity= (5.6 SCFH)x(Max pump-out rate) Required capacity= 704 SCFH Required venting capacity for normal vacuum relief due to thermal inbreathing see table II-collumn 2 of API2000, 2.4.2 Required capacity= 2185 SCFH air Correction for climate 2185 if applicable Total required normal vacuum relief capacity = 704

+

2185

=

2890 82

(3) Emergency venting Emergency venting required in accordance with API 2000, section 4.3.3.2, Table 3 Required capacity Q= -3809 m3/hour (incl. the environmental factor) -134194 SCFH air

SCFH air m3/hour

Tank Venting Calculations API2000 Data Given : Diameter Height Tank capacity Code Design pressure Design vacuum Flash point product Max pump-in rate Max pump-out rate Tank insulated ? Hot Climate Insulation thicknes Environmental factor

Wetted area

metric 24.0 m 14.5 m 6537 m3 Low Pressure 20 mbar 6 mbar o -40 C 900 m3/hour 900 m3/hour N no 0 mm 689

m2

U.S. 79 47.4 41111 Low 8.03 2.41 -40 5659 5659 N no 0 1 7419

ft ft barrels Pressure inch w.c. inch w.c. o F barrels/h barrels/h

inch ft

SCFH = Standard Cubic Feet of air per Hour

(1) Normal outbreathing (Pressure relief) requirements: Required venting capacity for normal pressure relief due to pumping-in Required capacity= (12xSCFH )x(Max pump-in rate) Required capacity= 67914 SCFH Required venting capacity for normal pressure relief due to thermal outbreathing see table II-collumn 3 of API2000, 2.4.2 for product with flash point >100 oF (INTERMEZZO-I) Required capacity= 34926 SCFH air Total required normal pressure relief capacity = 67914

+

34926

=

102840 2919

SCFH air m3/hour

(2) Normal inbreathing (Vacuum relief) requirements: Required venting capacity for normal vacuum relief due to pumping-out Required capacity= (5.6 SCFH)x(Max pump-out rate) Required capacity= 31693 SCFH Required venting capacity for normal vacuum relief due to thermal inbreathing see table II-collumn 2 of API2000, 2.4.2 Required capacity= 34926 SCFH air Correction for climate 34926 if applicable Total required normal vacuum relief capacity = 31693

+

34926

=

66619 1891

(3) Emergency venting Emergency venting required in accordance with API 2000, section 4.3.3.2, Table 3 Required capacity Q= 19910 m3/hour (incl. the environmental factor) 701353 SCFH air

SCFH air m3/hour