PIPELINE STRESS ANALYSIS WITH CAESAR II
Download
Report
Transcript PIPELINE STRESS ANALYSIS WITH CAESAR II
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