PIPELINE STRESS ANALYSIS WITH CAESAR II by Andrey Puruhita

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PIPELINE STRESS ANALYSIS WITH
CAESAR II
by
Andrey Puruhita
PIPELINE STRESS ANALYSIS
WITH CAESAR II
 What the different with piping stress ?
 Pipeline burried modeling
 Anchor block restrain
 Load case combination & result
The difference of piping & pipeline
stress analysis
Piping modeling
• Code requirement shall use
ASME B31.3
• Aboveground
• Many support or restrain
needed
Pipeline modeling
• Code requirement use
ASME B31.4 for liquid &
B31.8 for gas transmission
• Usually Underground
• Shall use anchor block as a
restrain from abovegroundunderground conversely
Burried Pipe
• Buried pipe deforms laterally in areas
immediately adjacent to changes in directions
• In areas far removed from bends and tees the
deformation is primarily axial
PIPELINE BURRIED MODELING
• The Buried Pipe Modeler is started by selecting an existing
job, and then choosing menu option Input-Underground from
the CAESAR II Main Menu
• Enter the soil data using Buried Pipe - Soil Models
• Describe the sections of the piping system that are buried,
and define any required fine mesh areas using the buried
element data spreadsheet
• Convert the original model into the buried model by the
activation of option Buried Pipe - Convert Input
Input soil models
The buried element description spreadsheet serves
several functions
• It allows the user to define which part of the piping system is
buried.
• It allows the user to define mesh spacing at specific element
ends.
• It allows the input of user defined soil stiffnesses
Burried pipe example
Anchor Block Restrain
• Pipeline with a long distance needs block
valve, there were a change direction from
underground to aboveground
• In this situation pipeline must be installed
with anchor block before and after
aboveground pipe
Why we need anchor block ?
• To prevent stress failed on block valve due to
axial deformation of a long pipeline
Example of block valve modeling
Anchor block
Anchor block
Load Case Combination
• To check stress analysis on pipeline shall use
several load case combination as folow :
• Sustain Load ( W + P)
• Thermal Load (T)
• Combination Load ( W + T + P)
Caesar Stress Result
•
•
•
•
•
CAESAR II STRESS REPORT
FILE:FOR TUTORIAL
CASE 3 (OPE) W+T2+P1
DATE:OCT 1,2009
--Stress(lb./sq.in.)----(lb./sq.in.)-ELEMENT BENDING TORSION
SIF'S
ALLOWABLE
NODES
STRESS
STRESS IN/OUT PLANE STRESS STRESS %
•
•
•
•
•
•
•
HIGHEST STRESSES: (lb./sq.in.)
OPE STRESS %:
21.06 @NODE 90
STRESS:
12636.4 ALLOWABLE: 60000.0
BENDING STRESS:
3254.8 @NODE 90
TORSIONAL STRESS:
0.0 @NODE 49
AXIAL STRESS:
9455.2 @NODE 130
3D MAX INTENSITY:
30120.4 @NODE 20
•
•
60
70
1357.
919.
0. 1.000 / 1.000 10739. 60000. 18.
0. 1.000 / 1.000 10300. 60000. 17.
•
•
80
90
1461.
3255.
0. 1.000 / 1.000 10842.
0. 1.000 / 1.000 12636.
60000. 18.
60000. 21.
•
•
90
95
3255.
2703.
0. 1.000 / 1.000 12636.
0. 1.000 / 1.000 12085.
60000. 21.
60000. 20.
THANK YOU

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