ASME B31G Remaining Strength of Corroded Pipeline

Read about START-PROF pipe stress analysis software

Allows to calculate, if the corroded pipeline segment must be replaced. The results of analysis are:

• Failure stress: the maximum allowed hoop stress
• Safe pressure: the maximum allowed operating pressure, with safety factor
• Burst pressure: the burst pressure, without the safety factor
• The maximum allowed flaw length

Method #1 Original B31G (.67dL), B31G Level 1

This method approximates the flaw area A as 0.67 * d * L

Method #2 Modified B31G (.85dL), B31G Level 1

This method approximates the flaw area A as 0.85 * d * L

Method #3 Exact Trapezoid

Calculates the corroded area A numerically using the trapezoid method

Method #4 Equivalent Area

Calculates the corroded area A as d_a * L, where d_a is average pit depth. An equivalent flaw length L * d_a / d is used in the computation of the Folias factor.

Method #5 RSTRENG Effective Area, B31G Level 2

Calculates the corroded area A calculated numerically using the trapezoid method. All possible combinations of local metal loss A are calculated, n!/2(n − 2)! iterations are required to examine all possible combinations of local metal loss with respect to surrounding remaining material. The exact trapezoid method is just a special case of an effective method.

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ASME B31G > Pipe