本规程为按照ASME B31设计和建造的陆上金属管道的弯管评估、选择和规范提供了指南。8输配气管道系统和ASME B31。4液体和泥浆的管道运输系统。本规程涵盖以下类型的弯管:a.制造配件b。感应（热）弯管在现场外形成。现场形成的冷弯弯管本规程通过根据特定的现场通行权、管道尺寸和壁厚、运输考虑、管道椭圆度、清管要求等提供利弊，为选择何种弯管类型提供了指导。 此外，还提供了更多解释性参考和建议。

This Practice provides guidance for evaluation, selection, and specification of pipe bends for on-shore metallic pipelines designed and constructed to ASME B31.8 Gas Transmission and Distribution Piping Systems and ASME B31.4 Pipeline Transportation Systems for Liquids and Slurries. This Practice covers the following types of bends:a. Manufactured fittingsb. Induction (hot) bends formed off-sitec. Cold bends formed on-siteThis Practice provides guidance for evaluation of which bend type to select by providing pros and cons based on specific site rights-of-way, pipe size and wall thickness, shipping considerations, pipe ovality, pigging requirements, etc. Additional, more explanatory references recommendations are also provided.