Combined Stress Modules

Links : ±

CALCULATOR MODULE : Pipeline Combined Stress Check ±

Calculate pipeline longitudinal stress, Tresca combined stress, and Von Mises equivalent stress checks. Hoop stress is calculated using either Barlow's equation (suitable for thin wall pipes), the log equation (suitable for thick wall pipes), or Lame's equation (suitable for thick wall pipes).

The axial load is calculated using the thick wall formula (API RP 1111 and DNV OS F101). For onshore and offshore pipelines the internal pressure is assumed zero during installation. For offshore pipelines, the external pressure is assumed constant for installation and operation. For onshore pipelines external pressure should be ignored. The design factor should include all relevant factors (eg quality factor E and stress factor F etc).

Change Module :

Lame's Equation Compound Cylinder Or Pipe Calculation Module
Lame's Equation Thick Wall Pipe Stress Calculation Module
Pipeline Allowable Stress Calculation Module
Pipeline Axial Load Calculation Module
Pipeline Collapse Pressure Calculation Module
Pipeline Expansion Spool Calculation Module
Pipeline Fluid Velocity And Flowrate Calculation Module
Pipeline Fluid Volume And Mass Calculation Module
Pipeline Hoop Stress Calculation Module
Pipeline Local Pressure Calculation Module
Pipeline Maximum Allowable Design Pressure Calculation Module
Pipeline Natural Vibration Frequency Calculation Module
Pipeline Test Pressure Calculation Module
Pipeline Wall Thickness Calculation Module
Pipeline Yield Stress And Tensile Stress Calculation Module
All

CALCULATOR MODULE : Pipeline Expansion Spool ±

Calculate pipeline expansion spool length and combined stress check.

The expansion spool is analysed as a beam fixed at both ends, with a lateral offset. For expansion spools in contact with the ground, the soil forces are analysed as a uniformly distributed load equal to the lateral friction force (pipe weight x soil friction coefficient). Bending is assumed to be in plane. Torsion is ignored. For flanged spools the bending moment generally governs the design. Fatigue should also be considered.

Change Module :

Lame's Equation Compound Cylinder Or Pipe Calculation Module
Lame's Equation Thick Wall Pipe Stress Calculation Module
Pipeline Allowable Stress Calculation Module
Pipeline Axial Load Calculation Module
Pipeline Collapse Pressure Calculation Module
Pipeline Combined Stress Check Calculation Module
Pipeline Fluid Velocity And Flowrate Calculation Module
Pipeline Fluid Volume And Mass Calculation Module
Pipeline Hoop Stress Calculation Module
Pipeline Local Pressure Calculation Module
Pipeline Maximum Allowable Design Pressure Calculation Module
Pipeline Natural Vibration Frequency Calculation Module
Pipeline Test Pressure Calculation Module
Pipeline Wall Thickness Calculation Module
Pipeline Yield Stress And Tensile Stress Calculation Module
All
More Pipeline Expansion Spool Modules

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)

Change Module :

API RP 1111 Pipeline Axial Load Calculation Module
API RP 1111 Pipeline Burst Pressure Calculation Module
API RP 1111 Pipeline Collapse Pressure Calculation Module
API RP 1111 Pipeline Design Pressure Calculation Module
API RP 1111 Pipeline Fluid Velocity And Flow Rate Calculation Module
API RP 1111 Pipeline Fluid Volume And Mass Calculation Module
API RP 1111 Pipeline Hoop Stress Calculation Module
API RP 1111 Pipeline Limit State Design Line Pipe Schedule Calculation Module
API RP 1111 Pipeline Local Pressure Calculation Module
API RP 1111 Pipeline Mass And Weight Calculation Module
API RP 1111 Pipeline Ovality Calculation Module
API RP 1111 Pipeline Temperature Derating Calculation Module
API RP 1111 Pipeline Test Pressure Calculation Module
API RP 1111 Pipeline Wall Thickness Calculation Module
All
More Pipeline Local Buckling Modules

CALCULATOR MODULE : AS 2885.1 Pipeline Combined Stress ±

Calculate AS 2885.1 pipeline longitudinal stress and combined stress.

The stress check can be performed for longitudinal stress, Tresca stress and von Mises equivalent stress. Pipe axial load can be calculated for fully restrained pipe, unrestrained pipe, user defined external or global load, and user defined wall load. Bending moment can be calculated for in plane bending, out of plane bending, or combined in plane and out of plane bending. The stress concentration factors ii, io and it can be used for in plane, out of plane and torsion shear stress in pipe fittings. For straight pipe ii, io and it equal one.

Reference : Australian Standard AS 2885.1 : Pipelines - Gas And Liquid Petroleum Part 1 : Design And Construction (2015)

Change Module :

AS 2885.1 Gas And Liquid Pipeline Schedule Calculation Module
AS 2885.1 Pipeline Allowable Stress Calculation Module
AS 2885.1 Pipeline Bend Thickness Calculation Module
AS 2885.1 Pipeline Bolt Torque Calculation Module
AS 2885.1 Pipeline Branch Reinforcement Calculation Module
AS 2885.1 Pipeline Cold Bend Buckle Calculation Module
AS 2885.1 Pipeline Collapse Pressure Calculation Module
AS 2885.1 Pipeline Design Pressure Calculation Module
AS 2885.1 Pipeline Fatigue Stress Calculation Module
AS 2885.1 Pipeline Fluid Velocity And Flow Rate Calculation Module
AS 2885.1 Pipeline Fluid Volume And Mass Calculation Module
AS 2885.1 Pipeline Fracture Toughness Calculation Module
AS 2885.1 Pipeline Hoop Stress Calculation Module
AS 2885.1 Pipeline Hydrotest Pressure Calculation Module
AS 2885.1 Pipeline Local Pressure Calculation Module
AS 2885.1 Pipeline Mass And Weight Calculation Module
AS 2885.1 Pipeline Maximum Velocity Calculation Module
AS 2885.1 Pipeline Road And Rail Crossing Calculation Module
AS 2885.1 Pipeline Wall Thickness Calculation Module
All
More Combined Stress Modules