connekt, llc · 2019. 4. 16. · properties of sa 516 gr 65, as per asme sec-ii, part-d, table-5a...

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Connekt , LLC

FE Analysis : Pressure Vessel

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INDEX

1. INTRODUCTION

2. OBJECTIVE

3. ASSUMPTIONS

4. CAD MODEL

5. MESHED MODEL

6. FE MODEL INFORMATION

7. MATERIAL PROPERTIES

8. LOADS AND BOUNDARY CONDITIONS

9. PROCEDURE

10. RESULTS – DEFLECTIONS AND STRESSES

11. RESULTS SUMMARY

12. OBSERVATIONS AND CONCLUSION

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1. INTRODUCTION

This Report consists of Results and Conclusions for FE Structural Stress Analysis of Vessel carried out to evaluate the Design adequacy for various loads like Design Pressure, Hydro Test Pressure & Nozzles External Loads.

Based on the Inputs, Vessel dish end from flange with 9 Nos. Nozzles, 2 Stiffener Rings and 2 Sliding Saddles are considered for the Analysis.

Analysis is carried out for 3 Load Cases :Load Case-1 - First is for Internal Pressure, Temperature and Nozzles Loads; Load Case-2 – Second is for Nozzle Loads NO Internal Pressure;Load Case-3 - Third is for Hydro Test for the Pressure of 7.2 Bars.

2.0 OBJECTIVE

To evaluate the design of Vessel Nozzles, Saddles and Stiffeners under various Loads.

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3.0 ASSUMPTIONS

1. Material Properties are correct as per ASME Sec-II D.

2. Linear Material of Steel are taken for the Analysis Purpose.

3. Loads and Boundary Conditions applied as per the Supplied Inputs.

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4. CAD MODEL : Assembly considered for FEA

S4

S1A

S2A

S3

Nozzles S3, S4, S5, S8, S9, S1A , S6A, S2A are areas of interest.

S6A S5

S8

S9

SLIDING

SADDLE

STIFFNER RING-1

FIXED

SADDLE

STIFFNER RING-2

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5. MESHED MODEL : Assembly considered for FEA

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The Vessel with nozzles is meshed with 2nd Order Tetrahedral Elements.

No. of Nodes in the Model = 3,73,787 No. of Elements in the Model =

1,98,188

The quality of elements is qualifying following criteria:-

From all the components in the FE Model Assembly, 99% of elements

Qualify for :-

Achieved

6. FE MODEL INFORMATION :

Tetra Collapse > 0.1 (0% failed)

Skew < 60 (0% failed)

Jacobian > 0.5 (0% failed)

Vol. Aspect Ratio < 9.75 (0% failed)

Min. Angle Tria Faces > 15 (0% failed)

Max. Angle Tria Faces < 130 (0% failed)

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7. MATERIAL PROPERTIES :

Properties of SA 516 Gr 65, as per ASME Sec-II, Part-D, Table-5A

•Thermal conductivity : 0.0479 W/mm/oC

•Thermal Expansion : 12.4 E-6 / oC

•Elongation : 19% min in 8” 23% min in 2”

•Max. Allowable Stress (Sm) : 144 MPa

2010 ASME Boiler and pressure vessel code, Section II, Part D

MATERIAL Young’s Modulus

(MPA)

Poisson's

Ratio

Yield Strength

(MPa)

Tensile Strength (MPa)

SteelSA 516 Gr 65

198,000 0.29 240 450

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8. Loads and Boundary Conditions

Design pressure applied on all the

No external loads on S3 & S4

inner surface of vessel and nozzles

Hydro Test Pressure = 7.2Bar,

Design Temp. 159Deg. C

S4

S1A

S2A

S3

S6AS5

S8S9

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9.0 PROCEDURE

• 2D drawing is converted to 3D model as per the drawings.

• The model is imported into Hyper mesh and meshed using solid tetra elements.

• These elements were imported to ANSYS and assigned the Material Properties to each

component as specified in drawings.

• The boundary conditions are applied as per Section-8 in this report.

• Design pressure of 5.5 Bars is applied over the inner surfaces of vessel and nozzles.

• Nozzle loads were applied as per nozzle loads table.

• For load cases, temperature of 159oC is applied over the inner surfaces of vessel.

• Model is solved for 3 different load cases as specified in Introduction section in this report.

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10. RESULTSLoad Case-1 : Internal pressure, Temperature & nozzles loads

CONSTRAINTS ON SLIDING SADDLE

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9.1 Stress Analysis Results : Load Case-1Deflection Plot (mm) Internal pressure, temperature, nozzles loads

Max. Deflection = 18mm

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9.2 Stress Analysis Results : Load Case-1Deflection Plot (mm)


Internal pressure, temperature, nozzles loads

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9.5 Stress Analysis Results : Load Case-1Stress Plot (MPa) : Von-Mises Stresses

S4

S1A

S2A

S3

S6A S5

S8

S9

Stress linearization

Stress (Pl+Pb+Q) = 358 MPa


S5

S2A

Stress (Pl+Pb+Q) = 291 MPaFor reference only

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S4

S1A

S2A

S3

S6A S5

S8

S9




S6A

S8


Stress (Pl+Pb+Q) = 302 MPaFor reference only

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9.7 Stress Analysis Results : Load Case-1

S4

S1A

S2A

S3

S6A

S8

S9Stress linearization

Stress Plot (MPa) : Von-Mises Stresses

S4

S5



S9




For reference only

07/10/2011


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S4

S1A

S2A

S3

S6A S5

S8

S9



S3

S1A




For reference only

S4

S1A

S2A

S3

S6AS5

S8

S9

R1



R2

R2R1

Stress (Pl+Pb+Q) = 342 MPa Stress (Pl+Pb+Q) = 91 MPa 20

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Stress Plot (MPa) : von-Mises Stresses

Stress (Pl+Pb+Q) = 1055 MPa Stress (Pl+Pb+Q) = 985 MPa

Sliding Saddle Fixed Saddle

After masking localized stress areas

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10. RESULTSLoad Case-2 : Nozzles loads, NO Internal Pressure & Temperature

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Max. Deflection = 3 mm

Nozzles loads only

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Max. Deflection = 0.87mm

Nozzles loads only

Top View Bottom View

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S4

S1A

S2A

S3

S6A S5

S8

S9





S5

S2A

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Stress (Pl+Pb+Q) = 2.5 MPa

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S4

S1A

S2A

S3

S6A S5

S8

S9




S6A

S8

For reference only



S4S4

S9

S1A

S2A

S3

S6A S5


S9

Stress (Pl+Pb+Q) = 17 MPaStress (Pl+Pb+Q) = 4 MPa


Stress (Pl+Pb+Q) = 14 MPa 27

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S4

S1A

S2A

S3

S6A S5

S8




S1A

S3


For reference only

S4

S1A

S2A

S3

S6AS5

S8

S9

R1

29




S1A

R2

R2R1

For reference only


R1

S1A

R2


30


Sliding Saddle


Fixed SaddleStress (Pl+Pb+Q) = 15 MPa

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11. RESULTS Load Case-3 : Hydro Test

Hydro Pressure=7.2 bar

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11.1 Deflection Analysis Results : Load Case-3Deflection Plot (mm)


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S4

S1A

S2A

S3

S6A S5

S8

S9



S2A

S5

Stress (Pl+Pb+Q) = 106 MPa 36

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S4

S1A

S2A

S3

S6A S5

S8





S6A

S8

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38


S4

S1AS3 S8

S9


S4

S2AS6A S5





S9


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S3 S4

S1A

S2A

S3

S6A S5

S8




S1A

For reference only

S4

S1A

S2A

S3

S6AS5

S8

S9

R1



R2

R2R1

Stress (Pl+Pb+Q) = 342MPa Stress (Pl+Pb+Q) = 114 MPa

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R2

Sliding SaddleFixed Saddle


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12.0 Result Summary:-

Stress Categories

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43Stress Sm = 144 MPa

12.1 Stress Result Summary:-

Nozzle No. Stress Category Load Case No. Stresses Baseline

Iteration (MPa)

S3 Pl+Pb <1.5*Sm (207 MPa) LC-2 209

Pl+Pb+Q <3*Sm (414 MPa) LC-1 38

Pl+Pb+Q <3*Sm (414 MPa) LC-3 254

S4 Pl+Pb <1.5*Sm (207 MPa) LC-2 17

Pl+Pb+Q <3*Sm (414 MPa) LC-1 58

Pl+Pb+Q <3*Sm (414 MPa) LC-3 137

S5 Pl+Pb <1.5*Sm (207 MPa) LC-2 7

Pl+Pb+Q <3*Sm (414 MPa) LC-1 50

Pl+Pb+Q <3*Sm (414 MPa) LC-3 106

S8 Pl+Pb <1.5*Sm (207 MPa) LC-2 321

Pl+Pb+Q <3*Sm (414 MPa) LC-1 396

Pl+Pb+Q <3*Sm (414 MPa) LC-3 207

For reference only

Stress Sm = 144 MPa



Iteration (MPa)

S6A Pl+Pb <1.5*Sm (207 MPa) LC-2 2.5

Pl+Pb+Q <3*Sm (414 MPa) LC-1 73

Pl+Pb+Q <3*Sm (414 MPa) LC-3 76

S9 Pl+Pb <1.5*Sm (207 MPa) LC-2 1

Pl+Pb+Q <3*Sm (414 MPa) LC-1 31

Pl+Pb+Q <3*Sm (414 MPa) LC-3 69

S1A Pl+Pb <1.5*Sm (207 MPa) LC-2 12

Pl+Pb+Q <3*Sm (414 MPa) LC-1 35

Pl+Pb+Q <3*Sm (414 MPa) LC-3 71

S2A Pl+Pb <1.5*Sm (207 MPa) LC-2 227

Pl+Pb+Q <3*Sm (414 MPa) LC-1 358

Pl+Pb+Q <3*Sm (414 MPa) LC-3 335

For reference only

Stress Sm = 144 MPa



Iteration (MPa)

Sliding

Saddle

Pl+Pb <1.5*Sm (207 MPa) LC-2 28

Pl+Pb+Q <3*Sm (414 MPa) LC-1 1055

Pl+Pb+Q <3*Sm (414 MPa) LC-3 1104

Fixed

Saddle

Pl+Pb <1.5*Sm (207 MPa) LC-2 15

Pl+Pb+Q <3*Sm (414 MPa) LC-1 985

Pl+Pb+Q <3*Sm (414 MPa) LC-3 861

Stiffener

Ring R1

Pl+Pb <1.5*Sm (207 MPa) LC-2 32

Pl+Pb+Q <3*Sm (414 MPa) LC-1 91

Pl+Pb+Q <3*Sm (414 MPa) LC-3 114

Stiffener

Ring R2

Pl+Pb <1.5*Sm (207 MPa) LC-2 72

Pl+Pb+Q <3*Sm (414 MPa) LC-1 342

Pl+Pb+Q <3*Sm (414 MPa) LC-3 342

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12.4 OBSERVATIONS AND CONCLUSION

1. Stresses in all the Nozzles are below respective Allowable Stresses as per the

Stress Categories of ASME Section-II D for all load cases, hence design is safeto carry these loads.

2. Stresses in both Saddles exceeds respective Allowable Stresses, hence

Saddle Design needs the modification to carry various loads.

3. Stresses in both Stiffener Rings are below respective Allowable Stresses,

hence Stiffener Ring Design is safe to carry various loads.

For reference only

Contact Us

Scott Raitt

Chief Executive Officer

[email protected]

15844 Norlene Way

Grass Valley, CA 95949

(530) 604-5821

connekt, llc · 2019. 4. 16. · properties of sa 516 gr 65, as per asme sec-ii, part-d, table-5a...

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