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Pipeline Local Buckling Modules

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Collapse Pressure   ±

Calculate DNVGL-ST-F101 submarine pipeline external collapse pressure and propagating buckle pressure.

The external pressure should be calculated for the maximum water depth. Propagating buckles are only a problem if collapse has occurred. Buckle arrestors may be required to minimse the risk of propagating buckling.

Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Local Buckling   ±

Calculate DNVGL-ST-F101 submarine pipeline local buckling checks for combined loading.

The load controlled calculators should only be used for elastic deformation (check that the equivalent stress is less than the yield stress).

The displacement controlled calculators can be used for compressive elastic and plastic deformation. Elastic strains are calculated using the elastic modulus, and should not be used in the plastic range. Plastic strains should be calculated using finite element analysis (FEA). Use the allowable stress design (ASD) calculators for displacement controlled loads which include torsion.

Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Bend Allowable Stress Design (ASD)   ±

Calculate DNVGL-ST-F101 submarine pipeline allowable stress design (ASAD) check for combined loading. The allowable stress design (ASD) check can be used for pipeline induction bends with combined loading which includes a torsion load. The allowable stress design (ASD) check is a von Mises equivalent stress check.

Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Axial Load   ±

Calculate DNVGL-ST-F101 submarine pipeline axial load from temperature and pressure. The axial load calculations are valid in the elastic range only (check that the equivalent stress is less than the yield stress). The calculators include a combined load controlled check, displacement controlled check, allowable stress design check (ASD), and an equivalent stress check (von Mises).

Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL ST F101 Submarine Pipeline Expansion Spool   ±

Calculate DNVGL-ST-F101 submarine expansion spool local buckling and fatigue check.

The expansion spool is modelled as a simple beam with fixed ends, with a uniform distributed load due to friction and a lateral displacement at one end due to expansion. Pipe cross section properties are calculated for a single pipe layer with no coatings. For pipes with internal liner or external coatings use the user defined cross section properties option.

Reference : DNVGL-ST-F101 : Submarine Pipeline Systems (Download from the DNVGL website)

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CALCULATOR MODULE : API RP 1111 Pipeline Axial Load   ±
CALCULATOR MODULE : API RP 1111 Pipeline Collapse Pressure   ±
CALCULATOR MODULE : API RP 1111 Pipeline Combined Loading   ±

Calculate API RP 1111 limit state pipeline combined loading check.

For the external pressure check, the external pressure should be calcuated for the maximum water depth (highest astronomical tide plus storm surge). The internal pressure should be the maximum sustainable pressure (normally zero).

For the axial load check, the axial load can be calculated for either fully constrained pipeline, unconstrained pipeline, or user defined loads.

Reference : API RP 1111 : Design, Construction, Operation, and Maintenance of Offshore Hydrocarbon Pipelines (Limit State Design) (2011)

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