Pipeng Toolbox : Key Word Search Modules Login
Short Cuts
GO
Main ±
Beams ±
References ±
Fluid Flow ±
Fluid Properties ±
Maths ±
Materials ±
Pipelines ±
Soils ±
Subsea ±
Data ±
Units ±
Help ±
Demo

Energy Modules

Keyword(s) Energy. For a new search enter search key word(s) then click GO GO

Links : ±
CALCULATOR MODULE : AGA NG18 Crack Defect   ±

Calculate AGA NG-18 Level 0 critical defect length and minimum required fracture toughness from flow stress and hoop stress.

The level 0 assessment is useful as a screening check for crack defects. The level 0 check is from AS 2885.1. The temperature derating calculation is from ASME B31.8. Material specific test data should be used if it is available. Use the level 1 assessment for simple defects from defect length and depth. Use the level 2 assessment for complex defects from the defect river bottom profile. Refer to the module list below.

AGA NG-18 is suitable for crack defects. For blunt defects including corrosion, mechanical damage and grinding repairs etc the ASME B31G or RSTRENG calculators are recommended.

Reference : AGA Pipeline Research Committee NG-18 Report 204 Ductile Fracture Properties of Selected Linepipe Steels

Change Module :

Related Modules :

CALCULATOR MODULE : Pipeline Dent   ±

Calculate pipe dent depth, dent energy and dent force using either the Ellinas and Walker equation, the Wierzbicki and Suh equation, or the general equation (John Brown).

References :

Elìinas, C. P., and Walker, A. C, Damage on Offshore Tubular Bracing Members, IABSE Colloquium—Copenhagen 1983, vol 42, pp. 253-261.
Wierzbicki, T. and Suh, M-S. Denting Analysis of Tubes Under Combined Loading. Report MITSG 86-5, Sea Grant Program, Massachusettes Institute Of technology, (1986).
John Brown Engineering And Construction.

CALCULATOR MODULE : AS 2885.1 Pipeline Fracture Toughness   ±

Calculate AS 2885.1 pipeline critical defect length and fracture toughness.

The critical defect length is calculated from the flow stress and the maximum hoop stress using the Folias factor Mt. The initiation crack length is assumed to be equal to 0.8 - 0.9 of the critical defect length. The required initiation fracture toughness can then be calculated from the initiation defect length. The required CVN is then calculated from the fracture toughness.

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

Change Module :

CALCULATOR MODULE : Bernoulli's Equation Energy Grade Line   ±

Calculate gas pipeline Bernoulli pressure or energy grade line (EGL) from data points using the Bernoulli equation.

The Bernoulli or total pressure (EGL) is calculated by

`Pb = Ps + Pd + Pz `
`Ph = Ps + Pz `

where :

Pb = Bernoulli pressure or total pressure (EGL)
Ps = static pressure
Pz = potential pressure
Pd = dynamic pressure
Ph = hydraulic or piezometric pressure (HGL)

For constant diameter pipelines, the friction pressure loss can be calculated from the difference in Bernoulli pressure. For gas pipelines, the changes in dynamic pressure are usually small compared to the other terms so that the hydraulic pressure (HGL) can also be used to calculate pressure loss.

Note : The pressure terms are calculated at the selected data point. The data point option is set to pipe inlet when the page loads. Click calculate to update the data point options to include all of the data points before you select the data point. Click calculate each time you change the position data (X) values, and before you select the data point. Data points can be entered as comma separated values (Xi, Zi, Pi) with each set on a new line, or copy and paste from a spreadsheet.

Change Module :

Related Modules :

CALCULATOR MODULE : IAPWS R7-97 Steam Isoenergetic Constant Internal Energy   ±

Calculate IAPWS R7-97 constant internal energy isoenergetic steam temperature from initial internal energu and final pressure.

For an isoenergetic process the internal energy is constant. Initial internal energy can be calculated from the steam table or user defined. The anomaly zone is set to region 2 (region 3 does not converge properly). Use the Result Plot option to plot final (isoenergetic) properties and temperature versus initial internal energy.

Note : There is an anomaly in the steam calculation for region 3 between the saturated vapour line, the region 2/3 boundary, and the critical pressure. Refer to the region 3 anomaly help page for more details (click the utility button on the data bar). IAPWS R7-97 is intended for industrial use, and is a simplified version of IAPWS R6-95 for scientific use. IAPWS R7-97 was developed as an improvement of the IFC-67 model.

Reference : IAPWS R7-97 Industrial Formulation for thermodynamic Properties of Water and Steam

Change Module :

pipeng.com 2026 (467 μs : 4 ms : 0.816 MB) Pengu CMS ©