ASME B31J-2017
Stress Intensification Factors (i-Factors), Flexibility Factors (k-Factors), and Their Determination for Metallic Piping Components

Standard No.

ASME B31J-2017

Release Date

2017

Published By

American Society of Mechanical Engineers (ASME)

Status

Be replaced 2017-01

Replace By

ASME B31J-2017/errata-2017

Latest

ASME B31J-2023

Replace

ASME B31J-2008(R2013)

Scope

The ASME B31 Code for Pressure Piping and the ASME Boiler and Pressure Vessel Code, Section III, Nuclear Components, Subsections NC and ND piping rules require the use of stress intensification factors (SIFs or i-factors) and flexibility factors (k-factors) when checking the adequacy of components and joints (welded and nonwelded) in piping subject to various loads, including cyclic loads, that may produce fatigue failures. As used herein, where the word Code is used without specific identification, it means the Code that incorporates or references this Standard. Experimental methods to determine SIFs, flexibility factors, and sustained load factors are provided in the Nonmandatory Appendices. Compiled stress intensification and flexibility factor equations for common piping components are included in Table 1-1; see also Tables 1-2 and 1-3 and Figures 1-1 through 1-7. ASME B31 压力管道规范和 ASME 锅炉和压力容器规范第 III 部分，核部件，NC 和 ND 管道小节规则要求在检查承受各种载荷的管道中的组件和接头（焊接和非焊接）的充分性时使用应力增强系数（SIF 或 i 系数）和柔韧性系数（k 系数）， 包括可能导致疲劳失效的循环载荷。如本文所用，如果使用“代码”一词而没有特定的标识，则是指包含或引用本标准的“代码”。非强制性附录中提供了确定 SIF、柔韧性系数和持续荷载系数的实验方法。常见管道构件的应力强化和柔韧性系数方程包含在表 1-1 中;另见表1-2和1-3以及图1-1至1-7。

ASME B31J-2017 history

• 2023 ASME B31J-2023 Stress Intensification Factors (i-Factors), Flexibility Factors (k-Factors), and Their Determination for Metallic Piping Components
• 2017 ASME B31J-2017/errata-2017 Stress Intensification Factors (i-Factors), Flexibility Factors (k-Factors), and Their Determination for Metallic Piping Components
• 2017 ASME B31J-2017 Stress Intensification Factors (i-Factors), Flexibility Factors (k-Factors), and Their Determination for Metallic Piping Components
• 2008 ASME B31J-ES (SPANISH)-2008 Standard measurement method to determine escalation intensification factors (Factores i) for metal tube components