Tank Lifting Calculations

(1)

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LIST OF CONTENTS

1 INTRODUCTION

3

1.1 Project Background

3

1.2 Reference Drawing

3

1.3 Abbreviations

3

2 SUMMARY OF WORKS

4

2.1 Methodology

4

2.2 HOLDS

4

2.3 Assumptions

4

3 SUMMARY OF RESULTS

5

4 LEGISLATION, CODES, STANDARDS & REFERENCES

5

4.1 General

5 4.2 Shell Group Standards (DEP ver. 34)

5

4.3 International standards

5

4.4 Handbook

6

4.5 Language unit of measurements

6

5 CALCULATION SHEET

6

5.1 Lifting Beam Calculation For Jack Up

6

5.2 Beam Reinforcement Pad Calculation

13

5.3 Opening Stiffener Calculation

22

5.4 Clean Out Door Opening

33

(3)

LIST OF CONTENTS

1 INTRODUCTION

3

1.1 Project Background

3

1.2 Reference Drawing

3

1.3 Abbreviations

3

2 SUMMARY OF WORKS

4

2.1 Methodology

4

2.2 HOLDS

4

2.3 Assumptions

4

3 SUMMARY OF RESULTS

5

4 LEGISLATION, CODES, STANDARDS & REFERENCES

5

4.1 General

5 4.2 Shell Group Standards (DEP ver. 34)

5

4.3 International standards

5

4.4 Handbook

6

4.5 Language unit of measurements

6

5 CALCULATION SHEET

6

5.1 Lifting Beam Calculation For Jack Up

6

5.2 Beam Reinforcement Pad Calculation

13

5.3 Opening Stiffener Calculation

22

5.4 Clean Out Door Opening

33

(4)

1 INTRODUCTION

This calculation book consist of strength analysis required for the repair of

tank T-4804 at Marmul production station for Petroleum Development Oman

LLC hereafter referred as Purchaser / Owner / Company.

The extent of repair under this calculation book includes partial floor plate,

clean out door, opening reinforcement and required beam for shell plate jack

up.

1.1 Project Background

Concentric double wall wash tank T-4804, with nominal diameter of 36000

mm outer / 27500 mm inner and 9800 mm outer height / 10650 mm inner

height with the capacity of 8040 m

3

located in NIMR production station. Tank

required partial floor plate replacement including replacement of clean out

doors and reinforcement of opening on both shell.

In order to replace the annular plates under the shell, shell shall be lifted by

using hydraulic jacks with twenty four numbers of cantilever beams welded

to the shell.

1.2 Reference Drawing

NIM-48-110239-MS-4018-00001-0001/2

General Arrangement DWG for

T-4804

NIM-48-110239-MX-4024-00001-0001

Detail of bottom plate T-4804

NIM-48-110239-MX-2580-00001-0001

Detail of COD (Outer shell)

T-4804

NIM-48-110239-MX-2580-00002-0001

Detail of COD (Inner shell)

T-4804

NIM-48-110239-MX-2580-00003-0001

Detail of Opening reinforcement

T-4804

1.3 Abbreviations

The below abbreviations are adopted in this requisition

API

ASTM

American Petroleum Institute

American Society For Testing Materials

AVME

Approved Vendors of Materials and Equipment

(5)

WG-CCC

PDO

ASME

BS

SP

DEP

AISC

ASD

EN

WRC

Wood Group – CCC Ltd.

Petroleum Development Oman LLC

American Society of Mechanical Engineers

British Standard

Specification

Design Engineering Practice

American Institute of Steel Construction

Allowable Strength Design

European Norm

Welding research council

2

SUMMARY OF WORKS

2.1 Methodology

The main method is used in calculation of beams, pads, reinforcement are

the principal mechanical strength calculation from the references introduced

in Para. 4.0 herein.

2.2 Holds

There is not any HOLD point for the calculation.

2.3 Assumptions

-

Shell, roof, structure assumed not corroded and all the loads calculated

for the jacking purpose are for a new tank.

-

Roof truss are supported by inner shell only.

-

Tank is stable against wind condition and no calculation is performed for

the wind stability check as per Purchaser instruction.

-

Design code is as per DEP 34.51.01.31-Gen and EN14015.

-

Repair works is as per API 653.

-

Inner shell lifting beam is designed considering Max. jack lifting capacity

of 12 Ton.

(6)

-

Outer shell lifting beam is designed considering max. jack lifting capacity

of 15 Ton.

-

Thickness of reinforcing pad for outer shell jack up beam is assumed as

15 mm in calculation while used thickness is 20 mm.

-

Thickness of reinforcing pad for inner shell jack up beam is assumed as

10 mm in calculation while used thickness is 20 mm. 10 mm thk. Inner

pad is welded to shell to increase shell thickness locally.

3

SUMMARY OF RESULTS

Summary of results are as below:

-

Tank shell lifting beam size is HD 260 x 172 for inner and outer shell

-

Since the annular of outer tank will be repaired partially while inner tank

will be undergone complete annular plate replacement, Tank shell lifting

beam quantity will be 24 No.s for inner and 8 No.s for outer shell.

-

Tank shell opening reinforcement beam size is HD 320 x 245 for both

inner and outer shell.

4

LEGISLATION, CODES, STANDARDS &

REFERENCES

4.1 General

All listed documents shall be the latest issue. The international standards

shall be read in conjunction with the corresponding DEP amendment.

4.2 Shell Group Standards (DEP ver. 34):

DEP 00.00.06.06-Gen - Index of standard drawings

DEP 00.00.20.10-Gen. - The Use of SI Quantities.

DEP 34.51.01.33-Gen – Above ground vertical storage tanks (Amendments

to API 650)

DEP 34.51.01.31-Gen – Vertical steel storage tanks - Selection design and

construction (amendments/supplements to EN14015)

4.3 International Standards:

ASME SEC II, Ed.2010, Add.2011

Materials

API 650, Ed.2011 Welded tank for oil storage

(7)

BS/EN 14015, Ed.2004 Specification for the design and manufacture of site

built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for

the storage of liquids at ambient temperature and above

4.4 Handbook:

- Roark Formulas for Stress and Strain, Warren C. Young, Richard G.

Budynas, Sixth Ed.

- Pressure Vessel Design manual, Dennis R. Moss, Third Ed.

- AISC Manual of Steel Construction, ASD, 9th Edition, 1989.

- Pressure vessel design handbook, Henry H. Bednar,

4.5 Language and Units of Measurement

The English language and the SI system in accordance with

DEP.00.00.20.10-Gen of units shall be used throughout for all documentation

and drawings. Where necessary for a specific application, alternative units

may be indicated in brackets together with the SI units.

5

CALCULATION SHEET

5.1 Lifting Beam Calculation for Jack Up

The beam size used for the cantilever beam is HD 260X172:

Outer shell cantilever beam

Yield Stress for S-275JR: 275 Mpa

M: 15,000 x 0.5 x 9.81 = 73,575 N.m

Z: 2,159,000 mm

3

Bending stress: 34 Mpa < 165 Mpa (0.6*F

y

), OK

Inner shell cantilever beam

Yield Stress for S-275JR: 275 Mpa

M: 12,000 x 0.5 x 9.81 = 58,860 N.m

(8)

Z: 2,159,000 mm

3

Bending stress: 27.2 Mpa < 165 Mpa (0.6*F

y

), OK

Weld attachment between beam and pad

A common method of handling welds with fillet welds is further presented in a typical

example of connecting a beam using a double-sided fillet weld.

This practice is as per EN 1993-1-8, EN 10024, EN 10034, EN 10055, EN 10056, EN

10279, DS 952, DIN 15018, DIN 18800, DIN 1024, DIN 1025, DIN 1026, DIN 1028,

DIN 1029, CSN 050120:

Depending on the acting load, we can use the following relations to specify the

individual components of stress at point "A" of the weld:

- load with normal force Fz:

- Load with bending moment M:

- Load with shear force Fx:

(9)

- Load with torque T:

where:

A

w

... weld throat area [mm

2

, in

2

]

I

w

... moment of inertia of the weld [mm

4

, in

4

]

J

w

... polar moment of inertia of the weld [mm

4

, in

4

]

s

^

... normal stress vertical to the weld direction [MPa, psi]

s

ll

... normal stress parallel to the weld direction [MPa, psi]

t

^

... shear stress vertical to the weld direction [MPa, psi]

t

ll

... shear stress parallel to the weld direction [MPa, psi]

For connections stressed by combined load, the resulting "equivalent" stress in the

weld is specified from the relation:

Which for s

ll

= 0 can be adjusted as:

The sectional properties for the selected basic shapes of weld groups can be found

in the following table. In order to specify the polar moment of inertia of the weld, you

can use the following relation:

Where:

a.... Weld throat thickness [mm, in]: 15 * 0.707: 10.6 mm

B.... Width of weld group [mm, in]: 268 mm

D.... Weld diameter [mm, in]: 15 mm

H.... Height of weld group [mm, in]: 225 mm

L.... Weld length [mm, in]: Not applicable

s.... Flange thickness [mm, in]: 32.5 mm

t.... Web thickness [mm, in]: 18 mm

(10)

A

w

: 2 * 10.6 * (225+268-2*18): 9688.4 mm

2

I

wX

: 90,823,094.8 mm

4

Allowable stress for A-283 Gr.C: 0.6 * F

y

:137 Mpa for bending and combined

load and 0.4 * F

y

:92 Mpa for shear.

Ref.: Pressure vessel design handbook, Henry H. Bednar, Section 10.0

Weld design

F

y

: 15,000 kg: 147,150 N (Calculation for the worse case – outer shell only)

- Shear force: 15.2 Mpa < 0.4 * F

y

(92) Mpa OK

M: 15,000 x 0.5: 7500 kg.m (Calculation for the worse case – outer shell only)

- Bending moment: 117.5 Mpa < 0.6 * F

y

(137) Mpa OK

- Load Combination: 118.4 Mpa < 0.6 * F

y

(137) Mpa OK

Weld attachment between pad and shell

H: 1000 / 800 mm (Outer / Inner)

B: 1530 / 800 mm (Outer / Inner)

a: 14 x 0.707 / 6 x 0.707: 9.9 / 4.2 mm (Outer / Inner)

A

w

: 50,084 / 13,574 mm

2

(Outer / Inner)

I

wX

: 9,372,520,490 / 1,459,493,232 mm

4

(Outer / Inner)

F

y

: 15,000 / 12000 kg (Outer / Inner)

(11)

Allowable stress for A-283 Gr.C: 0.6 * F

y

:137 Mpa for bending and combined

load and 0.4 * F

y

:92 Mpa for shear.

- Shear force: 2.9 / 8.67 Mpa (Outer / Inner) < 0.4 * F

y

(92) Mpa OK

M: 7500 / 6000 kg.m (Outer / Inner)

- Bending moment: 3.93 / 16.13 Mpa (Outer / Inner) < 0.6 * F

y

(137) Mpa OK

(12)

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(14)

5.2 Beam Reinforcement Pad Calculation:

Attachment parameter

- Pressure Vessel Design manual, Dennis R. Moss, Third Ed. Procedure

5.3, attachment parameter

2C1: 0.8b: 0.8268: 214.4 mm

2C2: h: 290 mm

(15)

Outer shell cantilever beam

Input Echo, WRC107 Item 1, Description: Beam outshell

Diameter Basis for Vessel Vbasis OD

Cylindrical or Spherical Vessel Cylsph Cylindrical Internal Corrosion Allowance Cas 0.0000 mm. Vessel Diameter Dv 36012.000 mm. Vessel Thickness Tv 12.000 mm. Design Temperature 82.00 C Vessel Material SA-283 C Vessel UNS Number K02401

Vessel Cold S.I. Allowable Smc 137.00 N./mm² Vessel Hot S.I. Allowable Smh 137.00 N./mm² Attachment Type Type Rectangular Parameter C11 C11 214.40 mm. Parameter C22 C22 290.00 mm. Thickness of Reinforcing Pad Tpad 15.000 mm. Pad Parameter C11P C11p 1530.000 mm. Pad Parameter C22P C22p 1000.000 mm. Design Internal Pressure Dp 0.000 KPa. Include Pressure Thrust No External Forces and Moments in WRC 107 Convention:

Radial Load (SUS) P 0.0 Kgf Longitudinal Shear (SUS) Vl 15000.0 Kgf Circumferential Shear (SUS) Vc 0.0 Kgf Circumferential Moment (SUS) Mc 0.0 Kg-m. Longitudinal Moment (SUS) Ml 7500.0 Kg-m. Torsional Moment (SUS) Mt 0.0 Kg-m. Use Interactive Control No

WRC107 Version Version March 1979 Include Pressure Stress Indices per Div. 2 No Compute Pressure Stress per WRC-368 No WRC 107 Stress Calculation for SUStained loads:

Radial Load P 0.0 Kgf Circumferential Shear VC 0.0 Kgf Longitudinal Shear VL 15000.0 Kgf Circumferential Moment MC 0.0 Kg-m. Longitudinal Moment ML 7500.0 Kg-m. Torsional Moment MT 0.0 Kg-m. Dimensionless Parameters used : Gamma = 300.00 ( 666.94)

Dimensionless Loads for Cylindrical Shells at Attachment Junction:

--- Curves read for 1979 Beta Figure Value Location --- N(PHI) / ( P/Rm ) 0.008 4C ! 60.865 (A,B) N(PHI) / ( P/Rm ) 0.008 3C ! 61.826 (C,D) M(PHI) / ( P ) 0.007 2C1 ! 0.103 (A,B) M(PHI) / ( P ) 0.007 1C ! 0.150 (C,D) N(PHI) / ( MC/(Rm**2 * Beta) ) 0.007 3A ! 1.307 (A,B,C,D) M(PHI) / ( MC/(Rm * Beta) ) 0.007 1A ! 0.099 (A,B,C,D) N(PHI) / ( ML/(Rm**2 * Beta) ) 0.007 3B ! 5.450 (A,B,C,D) M(PHI) / ( ML/(Rm * Beta) ) 0.007 1B ! 0.054 (A,B,C,D) N(x) / ( P/Rm ) 0.007 3C ! 62.315 (A,B) N(x) / ( P/Rm ) 0.007 4C ! 61.100 (C,D) M(x) / ( P ) 0.008 1C1 ! 0.192 (A,B)

(16)

M(x) / ( P ) 0.008 2C ! 0.100 (C,D) N(x) / ( MC/(Rm**2 * Beta) ) 0.007 4A ! 1.325 (A,B,C,D) M(x) / ( MC/(Rm * Beta) ) 0.007 2A ! 0.057 (A,B,C,D) N(x) / ( ML/(Rm**2 * Beta) ) 0.007 4B ! 1.848 (A,B,C,D) M(x) / ( ML/(Rm * Beta) ) 0.007 2B ! 0.079 (A,B,C,D) Note - The ! mark next to the figure name denotes curve value exceeded.

Stress Concentration Factors Kn = 1.00, Kb = 1.00 Stresses in the Vessel at the Attachment Junction

--- | Stress Values at Type of | (N./mm² ) ---|--- Stress Load| Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Memb. P | 0 0 0 0 0 0 0 0 Circ. Bend. P | 0 0 0 0 0 0 0 0 Circ. Memb. MC | 0 0 0 0 0 0 0 0 Circ. Bend. MC | 0 0 0 0 0 0 0 0 Circ. Memb. ML | -5 -5 5 5 0 0 0 0 Circ. Bend. ML | -278 278 278 -278 0 0 0 0 | Tot. Circ. Str.| -284.7 273.0 284.7 -273.0 0.0 0.0 0.0 0.0 --- Long. Memb. P | 0 0 0 0 0 0 0 0 Long. Bend. P | 0 0 0 0 0 0 0 0 Long. Memb. MC | 0 0 0 0 0 0 0 0 Long. Bend. MC | 0 0 0 0 0 0 0 0 Long. Memb. ML | -2 -2 2 2 0 0 0 0 Long. Bend. ML | -383 383 383 -383 0 0 0 0 | Tot. Long. Str.| -385.9 381.1 385.9 -381.1 0.0 0.0 0.0 0.0 --- Shear VC | 0 0 0 0 0 0 0 0 Shear VL | 0 0 0 0 -9 -9 9 9 Shear MT | 0 0 0 0 0 0 0 0 | Tot. Shear| 0.0 0.0 0.0 0.0 -9.4 -9.4 9.4 9.4 --- Str. Int. | 385.88 381.14 385.88 381.14 18.79 18.79 18.79 18.79 --- Dimensionless Parameters used : Gamma = 300.00 (1500.00)

Dimensionless Loads for Cylindrical Shells at Pad edge:

--- Curves read for 1979 Beta Figure Value Location --- N(PHI) / ( P/Rm ) 0.034 4C ! 52.534 (A,B) N(PHI) / ( P/Rm ) 0.034 3C ! 45.764 (C,D) M(PHI) / ( P ) 0.039 2C1 ! 0.081 (A,B) M(PHI) / ( P ) 0.039 1C ! 0.126 (C,D) N(PHI) / ( MC/(Rm**2 * Beta) ) 0.037 3A ! 8.532 (A,B,C,D) M(PHI) / ( MC/(Rm * Beta) ) 0.037 1A ! 0.095 (A,B,C,D) N(PHI) / ( ML/(Rm**2 * Beta) ) 0.032 3B ! 27.412 (A,B,C,D) M(PHI) / ( ML/(Rm * Beta) ) 0.033 1B ! 0.054 (A,B,C,D) N(x) / ( P/Rm ) 0.038 3C ! 43.331 (A,B) N(x) / ( P/Rm ) 0.038 4C ! 51.149 (C,D) M(x) / ( P ) 0.036 1C1 ! 0.140 (A,B) M(x) / ( P ) 0.036 2C ! 0.089 (C,D) N(x) / ( MC/(Rm**2 * Beta) ) 0.037 4A ! 11.521 (A,B,C,D) M(x) / ( MC/(Rm * Beta) ) 0.036 2A ! 0.056 (A,B,C,D) N(x) / ( ML/(Rm**2 * Beta) ) 0.032 4B ! 7.734 (A,B,C,D) M(x) / ( ML/(Rm * Beta) ) 0.032 2B ! 0.077 (A,B,C,D)

(17)

Note - The ! mark next to the figure name denotes curve value exceeded.

Stress Concentration Factors Kn = 1.00, Kb = 1.00 Stresses in the Vessel at the Edge of Reinforcing Pad

--- | Stress Values at Type of | (N./mm² ) ---|--- Stress Load| Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Memb. P | 0 0 0 0 0 0 0 0 Circ. Bend. P | 0 0 0 0 0 0 0 0 Circ. Memb. MC | 0 0 0 0 0 0 0 0 Circ. Bend. MC | 0 0 0 0 0 0 0 0 Circ. Memb. ML | -17 -17 17 17 0 0 0 0 Circ. Bend. ML | -281 281 281 -281 0 0 0 0 | Tot. Circ. Str.| -299.1 264.4 299.1 -264.4 0.0 0.0 0.0 0.0 --- Long. Memb. P | 0 0 0 0 0 0 0 0 Long. Bend. P | 0 0 0 0 0 0 0 0 Long. Memb. MC | 0 0 0 0 0 0 0 0 Long. Bend. MC | 0 0 0 0 0 0 0 0 Long. Memb. ML | -3 -3 3 3 0 0 0 0 Long. Bend. ML | -406 406 406 -406 0 0 0 0 | Tot. Long. Str.| -409.4 403.1 409.4 -403.1 0.0 0.0 0.0 0.0 --- Shear VC | 0 0 0 0 0 0 0 0 Shear VL | 0 0 0 0 -6 -6 6 6 Shear MT | 0 0 0 0 0 0 0 0 | Tot. Shear| 0.0 0.0 0.0 0.0 -6.1 -6.1 6.1 6.1 --- Str. Int. | 409.39 403.06 409.39 403.06 12.26 12.26 12.26 12.26 --- WRC 107 Stress Summations:

Vessel Stress Summation at Attachment Junction

--- Type of | Stress Values at

Stress Int. | (N./mm² ) ---|--- Location | Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Pm (SUS) | 0 0 0 0 0 0 0 0 Circ. Pl (SUS) | -5 -5 5 5 0 0 0 0 Circ. Q (SUS) | -278 278 278 -278 0 0 0 0 --- Long. Pm (SUS) | 0 0 0 0 0 0 0 0 Long. Pl (SUS) | -2 -2 2 2 0 0 0 0 Long. Q (SUS) | -383 383 383 -383 0 0 0 0 --- Shear Pm (SUS) | 0 0 0 0 0 0 0 0 Shear Pl (SUS) | 0 0 0 0 -9 -9 9 9 Shear Q (SUS) | 0 0 0 0 0 0 0 0 --- Pm (SUS) | 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 --- Pm+Pl (SUS) | 5.8 5.8 5.8 5.8 18.8 18.8 18.8 18.8 --- Pm+Pl+Q (Total)| 385.9 381.1 385.9 381.1 18.8 18.8 18.8 18.8 ---

(18)

--- Type of | Max. S.I. S.I. Allowable | Result Stress Int. | N./mm² | ---|--- Pm (SUS) | 0.00 137.00 | Passed Pm+Pl (SUS) | 18.79 205.50 | Passed Pm+Pl+Q (TOTAL)| 385.88 411.00 | Passed --- WRC 107 Stress Summations:

Vessel Stress Summation at Reinforcing Pad Edge

Stress Int. | (N./mm² ) ---|--- Location | Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Pm (SUS) | 0 0 0 0 0 0 0 0 Circ. Pl (SUS) | -17 -17 17 17 0 0 0 0 Circ. Q (SUS) | -281 281 281 -281 0 0 0 0 --- Long. Pm (SUS) | 0 0 0 0 0 0 0 0 Long. Pl (SUS) | -3 -3 3 3 0 0 0 0 Long. Q (SUS) | -406 406 406 -406 0 0 0 0 --- Shear Pm (SUS) | 0 0 0 0 0 0 0 0 Shear Pl (SUS) | 0 0 0 0 -6 -6 6 6 Shear Q (SUS) | 0 0 0 0 0 0 0 0 --- Pm (SUS) | 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 --- Pm+Pl (SUS) | 17.3 17.3 17.3 17.3 12.3 12.3 12.3 12.3 --- Pm+Pl+Q (Total)| 409.4 403.1 409.4 403.1 12.3 12.3 12.3 12.3 --- --- Type of | Max. S.I. S.I. Allowable | Result Stress Int. | N./mm² | ---|--- Pm (SUS) | 0.00 137.00 | Passed Pm+Pl (SUS) | 17.32 205.50 | Passed Pm+Pl+Q (TOTAL)| 409.39 411.00 | Passed --- PV Elite is a trademark of Intergraph CADWorx & Analysis Solutions, Inc. 2011

(19)

Inner shell cantilever beam

Input Echo, WRC107 Item 2, Description: Beam inshell

(20)

--- | Stress Values at Type of | (N./mm² ) ---|--- Stress Load| Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Memb. P | 0 0 0 0 0 0 0 0 Circ. Bend. P | 0 0 0 0 0 0 0 0 Circ. Memb. MC | 0 0 0 0 0 0 0 0 Circ. Bend. MC | 0 0 0 0 0 0 0 0 Circ. Memb. ML | -6 -6 6 6 0 0 0 0 Circ. Bend. ML | -240 240 240 -240 0 0 0 0 | Tot. Circ. Str.| -247.1 234.0 247.1 -234.0 0.0 0.0 0.0 0.0 --- Long. Memb. P | 0 0 0 0 0 0 0 0 Long. Bend. P | 0 0 0 0 0 0 0 0 Long. Memb. MC | 0 0 0 0 0 0 0 0 Long. Bend. MC | 0 0 0 0 0 0 0 0 Long. Memb. ML | -3 -3 3 3 0 0 0 0 Long. Bend. ML | -330 330 330 -330 0 0 0 0 | Tot. Long. Str.| -334.5 327.2 334.5 -327.2 0.0 0.0 0.0 0.0 --- Shear VC | 0 0 0 0 0 0 0 0 Shear VL | 0 0 0 0 -7 -7 7 7 Shear MT | 0 0 0 0 0 0 0 0 | Tot. Shear| 0.0 0.0 0.0 0.0 -7.8 -7.8 7.8 7.8 --- Str. Int. | 334.55 327.18 334.55 327.18 15.61 15.61 15.61 15.61 --- Dimensionless Parameters used : Gamma = 300.00 ( 859.06)

(21)

(22)

(23)

5.3 OPENING STIFFENER CALCULATION

(24)

(25)

(26)

(27)

(28)

(29)

(30)

(31)

(32)

(33)

(34)

5.4 CLEAN OUT DOOR CALCULATION

Outer shell COD:

(35)

e

1

: 12.5 mm

Reinforcement plate material: A-283 Gr.C

e

r

: 12.5 + 3: 15.5 mm, we selected 16 mm for reinforcement plate

H: 9,800 mm: 9.8 m

e

br

: 25.04 mm, we selected 30 mm for bottom reinforcing plate  selected material is

SA 516 Gr.70N

(36)

Inner shell COD:

(37)

e

1

: 6 mm

Reinforcement plate material: A-283 Gr.C

e

r

: 6 + 3: 9 mm, we selected 10 mm for reinforcement plate

H: 10,650 mm: 10.65 m

e

br

: 25.86 mm, we selected 30 mm for bottom reinforcing plate  selected material is

SA 516 Gr.70N

(38)

1 INTRODUCTION

This calculation book consist of strength analysis required for the repair of

tank T-4804 at Marmul production station for Petroleum Development Oman

LLC hereafter referred as Purchaser / Owner / Company.

The extent of repair under this calculation book includes partial floor plate,

clean out door, opening reinforcement and required beam for shell plate jack

up.

1.1 Project Background

Concentric double wall wash tank T-4804, with nominal diameter of 36000

mm outer / 27500 mm inner and 9800 mm outer height / 10650 mm inner

height with the capacity of 8040 m

3

located in NIMR production station. Tank

required partial floor plate replacement including replacement of clean out

doors and reinforcement of opening on both shell.

In order to replace the annular plates under the shell, shell shall be lifted by

using hydraulic jacks with twenty four numbers of cantilever beams welded

to the shell.

1.2 Reference Drawing

NIM-48-110239-MS-4018-00001-0001/2

General Arrangement DWG for

T-4804

NIM-48-110239-MX-4024-00001-0001

Detail of bottom plate T-4804

NIM-48-110239-MX-2580-00001-0001

Detail of COD (Outer shell)

T-4804

NIM-48-110239-MX-2580-00002-0001

Detail of COD (Inner shell)

T-4804

NIM-48-110239-MX-2580-00003-0001

Detail of Opening reinforcement

T-4804

1.3 Abbreviations

The below abbreviations are adopted in this requisition

API

ASTM

American Petroleum Institute

American Society For Testing Materials

(39)

WG-CCC

PDO

ASME

BS

SP

DEP

AISC

ASD

EN

WRC

Wood Group – CCC Ltd.

Petroleum Development Oman LLC

American Society of Mechanical Engineers

British Standard

Specification

Design Engineering Practice

American Institute of Steel Construction

Allowable Strength Design

European Norm

Welding research council

2

SUMMARY OF WORKS

2.1 Methodology

The main method is used in calculation of beams, pads, reinforcement are

the principal mechanical strength calculation from the references introduced

in Para. 4.0 herein.

2.2 Holds

There is not any HOLD point for the calculation.

2.3 Assumptions

-

Shell, roof, structure assumed not corroded and all the loads calculated

for the jacking purpose are for a new tank.

-

Roof truss are supported by inner shell only.

-

Tank is stable against wind condition and no calculation is performed for

the wind stability check as per Purchaser instruction.

-

Design code is as per DEP 34.51.01.31-Gen and EN14015.

-

Repair works is as per API 653.

-

Inner shell lifting beam is designed considering Max. jack lifting capacity

of 12 Ton.

(40)

-

Outer shell lifting beam is designed considering max. jack lifting capacity

of 15 Ton.

-

Thickness of reinforcing pad for outer shell jack up beam is assumed as

15 mm in calculation while used thickness is 20 mm.

-

Thickness of reinforcing pad for inner shell jack up beam is assumed as

10 mm in calculation while used thickness is 20 mm. 10 mm thk. Inner

pad is welded to shell to increase shell thickness locally.

3

SUMMARY OF RESULTS

Summary of results are as below:

-

Tank shell lifting beam size is HD 260 x 172 for inner and outer shell

-

Since the annular of outer tank will be repaired partially while inner tank

will be undergone complete annular plate replacement, Tank shell lifting

beam quantity will be 24 No.s for inner and 8 No.s for outer shell.

-

Tank shell opening reinforcement beam size is HD 320 x 245 for both

inner and outer shell.

4

LEGISLATION, CODES, STANDARDS &

REFERENCES

4.1 General

All listed documents shall be the latest issue. The international standards

shall be read in conjunction with the corresponding DEP amendment.

4.2 Shell Group Standards (DEP ver. 34):

DEP 00.00.06.06-Gen - Index of standard drawings

DEP 00.00.20.10-Gen. - The Use of SI Quantities.

DEP 34.51.01.33-Gen – Above ground vertical storage tanks (Amendments

to API 650)

DEP 34.51.01.31-Gen – Vertical steel storage tanks - Selection design and

construction (amendments/supplements to EN14015)

4.3 International Standards:

ASME SEC II, Ed.2010, Add.2011

Materials

API 650, Ed.2011 Welded tank for oil storage

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BS/EN 14015, Ed.2004 Specification for the design and manufacture of site

built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for

the storage of liquids at ambient temperature and above

4.4 Handbook:

- Roark Formulas for Stress and Strain, Warren C. Young, Richard G.

Budynas, Sixth Ed.

- Pressure Vessel Design manual, Dennis R. Moss, Third Ed.

- AISC Manual of Steel Construction, ASD, 9th Edition, 1989.

- Pressure vessel design handbook, Henry H. Bednar,

4.5 Language and Units of Measurement

The English language and the SI system in accordance with

DEP.00.00.20.10-Gen of units shall be used throughout for all documentation

and drawings. Where necessary for a specific application, alternative units

may be indicated in brackets together with the SI units.

5

CALCULATION SHEET

5.1 Lifting Beam Calculation for Jack Up

The beam size used for the cantilever beam is HD 260X172:

Outer shell cantilever beam

Yield Stress for S-275JR: 275 Mpa

M: 15,000 x 0.5 x 9.81 = 73,575 N.m

Z: 2,159,000 mm

3

Bending stress: 34 Mpa < 165 Mpa (0.6*F

y

), OK

Inner shell cantilever beam

Yield Stress for S-275JR: 275 Mpa

M: 12,000 x 0.5 x 9.81 = 58,860 N.m

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Z: 2,159,000 mm

3

Bending stress: 27.2 Mpa < 165 Mpa (0.6*F

y

), OK

Weld attachment between beam and pad

A common method of handling welds with fillet welds is further presented in a typical

example of connecting a beam using a double-sided fillet weld.

This practice is as per EN 1993-1-8, EN 10024, EN 10034, EN 10055, EN 10056, EN

10279, DS 952, DIN 15018, DIN 18800, DIN 1024, DIN 1025, DIN 1026, DIN 1028,

DIN 1029, CSN 050120:

Depending on the acting load, we can use the following relations to specify the

individual components of stress at point "A" of the weld:

- load with normal force Fz:

- Load with bending moment M:

- Load with shear force Fx:

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- Load with torque T:

where:

A

w

... weld throat area [mm

2

, in

2

]

I

w

... moment of inertia of the weld [mm

4

, in

4

]

J

w

... polar moment of inertia of the weld [mm

4

, in

4

]

s

^

... normal stress vertical to the weld direction [MPa, psi]

s

ll

... normal stress parallel to the weld direction [MPa, psi]

t

^

... shear stress vertical to the weld direction [MPa, psi]

t

ll

... shear stress parallel to the weld direction [MPa, psi]

For connections stressed by combined load, the resulting "equivalent" stress in the

weld is specified from the relation:

Which for s

ll

= 0 can be adjusted as:

The sectional properties for the selected basic shapes of weld groups can be found

in the following table. In order to specify the polar moment of inertia of the weld, you

can use the following relation:

Where:

a.... Weld throat thickness [mm, in]: 15 * 0.707: 10.6 mm

B.... Width of weld group [mm, in]: 268 mm

D.... Weld diameter [mm, in]: 15 mm

H.... Height of weld group [mm, in]: 225 mm

L.... Weld length [mm, in]: Not applicable

s.... Flange thickness [mm, in]: 32.5 mm

t.... Web thickness [mm, in]: 18 mm

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A

w

: 2 * 10.6 * (225+268-2*18): 9688.4 mm

2

I

wX

: 90,823,094.8 mm

4

Allowable stress for A-283 Gr.C: 0.6 * F

y

:137 Mpa for bending and combined

load and 0.4 * F

y

:92 Mpa for shear.

Ref.: Pressure vessel design handbook, Henry H. Bednar, Section 10.0

Weld design

F

y

: 15,000 kg: 147,150 N (Calculation for the worse case – outer shell only)

- Shear force: 15.2 Mpa < 0.4 * F

y

(92) Mpa OK

M: 15,000 x 0.5: 7500 kg.m (Calculation for the worse case – outer shell only)

- Bending moment: 117.5 Mpa < 0.6 * F

y

(137) Mpa OK

- Load Combination: 118.4 Mpa < 0.6 * F

y

(137) Mpa OK

Weld attachment between pad and shell

H: 1000 / 800 mm (Outer / Inner)

B: 1530 / 800 mm (Outer / Inner)

a: 14 x 0.707 / 6 x 0.707: 9.9 / 4.2 mm (Outer / Inner)

A

w

: 50,084 / 13,574 mm

2

(Outer / Inner)

I

wX

: 9,372,520,490 / 1,459,493,232 mm

4

(Outer / Inner)

F

y

: 15,000 / 12000 kg (Outer / Inner)

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Allowable stress for A-283 Gr.C: 0.6 * F

y

:137 Mpa for bending and combined

load and 0.4 * F

y

:92 Mpa for shear.

- Shear force: 2.9 / 8.67 Mpa (Outer / Inner) < 0.4 * F

y

(92) Mpa OK

M: 7500 / 6000 kg.m (Outer / Inner)

- Bending moment: 3.93 / 16.13 Mpa (Outer / Inner) < 0.6 * F

y

(137) Mpa OK

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5.2 Beam Reinforcement Pad Calculation:

Attachment parameter

- Pressure Vessel Design manual, Dennis R. Moss, Third Ed. Procedure

5.3, attachment parameter

2C1: 0.8b: 0.8268: 214.4 mm

2C2: h: 290 mm

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Outer shell cantilever beam

Input Echo, WRC107 Item 1, Description: Beam outshell

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--- | Stress Values at Type of | (N./mm² ) ---|--- Stress Load| Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Memb. P | 0 0 0 0 0 0 0 0 Circ. Bend. P | 0 0 0 0 0 0 0 0 Circ. Memb. MC | 0 0 0 0 0 0 0 0 Circ. Bend. MC | 0 0 0 0 0 0 0 0 Circ. Memb. ML | -5 -5 5 5 0 0 0 0 Circ. Bend. ML | -278 278 278 -278 0 0 0 0 | Tot. Circ. Str.| -284.7 273.0 284.7 -273.0 0.0 0.0 0.0 0.0 --- Long. Memb. P | 0 0 0 0 0 0 0 0 Long. Bend. P | 0 0 0 0 0 0 0 0 Long. Memb. MC | 0 0 0 0 0 0 0 0 Long. Bend. MC | 0 0 0 0 0 0 0 0 Long. Memb. ML | -2 -2 2 2 0 0 0 0 Long. Bend. ML | -383 383 383 -383 0 0 0 0 | Tot. Long. Str.| -385.9 381.1 385.9 -381.1 0.0 0.0 0.0 0.0 --- Shear VC | 0 0 0 0 0 0 0 0 Shear VL | 0 0 0 0 -9 -9 9 9 Shear MT | 0 0 0 0 0 0 0 0 | Tot. Shear| 0.0 0.0 0.0 0.0 -9.4 -9.4 9.4 9.4 --- Str. Int. | 385.88 381.14 385.88 381.14 18.79 18.79 18.79 18.79 --- Dimensionless Parameters used : Gamma = 300.00 (1500.00)

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Inner shell cantilever beam

Input Echo, WRC107 Item 2, Description: Beam inshell

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--- | Stress Values at Type of | (N./mm² ) ---|--- Stress Load| Au Al Bu Bl Cu Cl Du Dl ---|--- Circ. Memb. P | 0 0 0 0 0 0 0 0 Circ. Bend. P | 0 0 0 0 0 0 0 0 Circ. Memb. MC | 0 0 0 0 0 0 0 0 Circ. Bend. MC | 0 0 0 0 0 0 0 0 Circ. Memb. ML | -6 -6 6 6 0 0 0 0 Circ. Bend. ML | -240 240 240 -240 0 0 0 0 | Tot. Circ. Str.| -247.1 234.0 247.1 -234.0 0.0 0.0 0.0 0.0 --- Long. Memb. P | 0 0 0 0 0 0 0 0 Long. Bend. P | 0 0 0 0 0 0 0 0 Long. Memb. MC | 0 0 0 0 0 0 0 0 Long. Bend. MC | 0 0 0 0 0 0 0 0 Long. Memb. ML | -3 -3 3 3 0 0 0 0 Long. Bend. ML | -330 330 330 -330 0 0 0 0 | Tot. Long. Str.| -334.5 327.2 334.5 -327.2 0.0 0.0 0.0 0.0 --- Shear VC | 0 0 0 0 0 0 0 0 Shear VL | 0 0 0 0 -7 -7 7 7 Shear MT | 0 0 0 0 0 0 0 0 | Tot. Shear| 0.0 0.0 0.0 0.0 -7.8 -7.8 7.8 7.8 --- Str. Int. | 334.55 327.18 334.55 327.18 15.61 15.61 15.61 15.61 --- Dimensionless Parameters used : Gamma = 300.00 ( 859.06)

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