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ASME B31.4 (2012) Liquid And Slurry Pipeline Design

# ASME B31.4 Liquid Pipeline Calculators

ASME B31.4 Pipe Wall Thickness Calculators : Pipe wall thickness is calculated from hoop stress using Barlow's equation. The mid wall diameter option (Dm) should only be used for offshore pipelines. The longitudinal weld factor does not apply to offshore pipelines. The corrosion allowance should include mechanical allowance (eg threads), erosion allowance and any other allowances. The design factor F includes an allowance for negative maufacturing tolerance or underthickness for approved pipeline specifications (403.2.1). The wall thickness can be calculated from either the outside diameter (constant OD), or the inside diameter (constant ID). The corrosion allowance is assumed to be on the inside of the pipeline. The wall thickness must be designed to contain the internal pressure at all points on the pipeline or pipeline section, allowing for external pressure and elevation. ASME B31.4 includes allowances for fabrication, and for pressure surge. Yield strength values are provided for API 5L.

ASME B31.4 Pipe Hoop Stress Calculators : Pipe hoop stress is calculated using Barlow's equation with either the nominal wall thickness, or the pressure design wall thickness (the nominal wall thickness minus the corrosion allowance), depending on the load case. The mid wall diameter option (Dm) should only be used for offshore pipelines. The girth weld factor does not apply to offshore pipelines. Pipe hoop stress should be calculated for the maximum pressure difference across the pipe wall, allowing for local elevation and water depth (water depth is relevant for subsea pipelines only).

ASME B31.4 Pipe Test Pressure Calculators : The local test pressure must be greater than or equal to the local design pressure multiplied by the test pressure factor, at all points on the pipeline or pipeline section. The hoop stress is calculated using either the nominal wall thickness, or the pressure design wall thickness (the nominal wall thickness minus the corrosion allowance), depending on use case. Generally the nominal wall thickness can be used. Care is required if the hoop stress exceeds 90% of SMYS. The Barlow's equation mid wall diameter option (Dm) should only be used for offshore pipelines.

ASME B31.4 Pipe Combined Stress Calculators : Pipe combined stress (hoop stress, axial stress, bending stress and torsion shear stress) is calculated using either Tresca's equation or Von Mises equation with either the nominal wall thickness, or the pressure design wall thickness (the nominal wall thickness minus the corrosion allowance). The combined stress check is not required for unrestrained pipelines.

ASME B31.4 Pipe Branch Reinforcement Calculators : Calculate the required reinforcement area for welded branches and extruded branches. The reinforcement area must be greater than or equal to the required area Ar. Only reinforcement within the reinforcement area can be included.

ASME B31.4 Pipe Ripple Calculators : Maximum ripple height can be calculated from the hoop stress. Pipeline ripples and other defects may also affect pipeline pigging.

ASME B31.4 Expansion Spool Calculators : Calculate expansion spool reaction force and bending moment from the end expansion length. Bending is assumed to be in plane. Torsion is assumed to equal zero. The effect of lateral pipe soil friction can also be included.

ASME B31 Flexibility Calculators : Estimate maximum allowable displacement of spools. Further analysis is required if the displacement limit is exceeded.

Pipe Axial Load Calculators : Pipe restrained and unrestrained axial load can be calculated using the thick wall equation (API RP 1111 and DNV-OS-F101). For onshore pipelines and platform piping use the no external pressure option.

ASME B31 Maximum Flange Bending Moment Calculators : Estimate the maximum allowable flange bending moment without leakage. The gasket is assumed to have no self sealing capability.

Internal And External Pressure Calculators : External pressure can be calculated from water depth or relative elevation. Internal pressure can be calculated from elevation for single phase gas, single phase liquid, or two phase gas liquid.

Reference : ANSI/ASME B31.4 : Pipeline Transportation Systems For Liquid Hydrocarbons and Other Liquids

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