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DNV Offshore Codes Collection
DNV Offshore Codes Amendments and Correction, April 2009
Showing posts with label DNV. Show all posts
Showing posts with label DNV. Show all posts
On-bottom Stability
Submarine pipelines stability is very important to ensure that pipelines subjected to environmental loadings stay acceptably stable resting on/buried under seabed. In other words, pipelines submerged weight must be more than hydrodynamic force to avoid flotation or lateral movements.
DNV RP F109
ON-BOTTOM STABILITY ANALYSIS AND DESIGN OF SUBMARINE PIPELINE : Mohd. Ridza (THESIS)
******************************DNV-RP-F109******************************
Design Methods:- Vertical stability in water
- Vertical stability in/on soil
- Dynamic lateral stability analysis
- Generalize lateral stability method
- Absolute lateral stability static method
DNV RP F109
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Design Methods:
- Dynamic method ( dynamic simulation of pipelines under the action of waves and current)
- Generalized method (use of a set of non-dimensional parameters to generalize Dynamic Analysis Results)
- Simplified Static Stability method (quasi-static equilibrium approach) SUITABLE for most of the design cases
ON-BOTTOM STABILITY ANALYSIS AND DESIGN OF SUBMARINE PIPELINE : Mohd. Ridza (THESIS)
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DNV-RP-F110 Global Buckling of Submarine Pipelines
DNV RP F110
Design: Limit State
Edition: 2007
"Global buckling implies that buckling of pipe as a bar in compression. It is a response to compressive effective axial force and not a failure mode."
Objective
Design: Limit State
Edition: 2007
"Global buckling implies that buckling of pipe as a bar in compression. It is a response to compressive effective axial force and not a failure mode."
Objective
- To prevent global buckling for burried pipelines.
- Allow exposed pipelines to buckle in controlled condition.
Scope
- Design of 10" - 42" rigid pipelines.
- ONLY limited to local bukling check.
- Scenarios covered are exposed pipelines on even seabed and uneven seabed and burried pipelines.
- Trawl interference only limited to lateral buckling.
Design
Effective Force wil be limited to residual lay tension, N after pipeline installation. During operation, temperature and pressure will increase contributed to maxinum compresive/restrained effective force, S0 .
Global buckling will occur if the restrained effective axial force (compression), So reach the initial effective axial force, Seff .
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