小制作管件、法兰、短管连接.doc

第 19 页 共 20 页1 范 围1.1 本标准规定了石油化工装置配管设计过程中B系列国标管件之间及其与JB钢制管法兰和短管间的最小连接尺寸。1.2 本标准适用于石油化工装置配管设计过程中DN15DN40 B系列和DN40DN500 B系列国标管件及其与JB钢制管法兰之间连接。1.3 本标准不适用上述管件与ANSI法兰、SH法兰之间的连接。2 一般规定2.1 本标准中所采用的各类管道组成件应符合以下规定管件：钢制对焊无缝钢管GB/T124592005（B系列）钢制承插焊管件 GB/T1438393（B系列）钢板制对焊管件 GB/T134012005（B系列）法兰：凸台面板式平焊钢制管法兰 JB/T8194（系列2）凸台面对焊钢制管法兰 JB/T82.194（系列2）凹凸面对焊钢制管法兰 JB/T82.194（系列2）环连接面对焊钢制管法兰JB/T82.494（系列2）2.2 管子壁厚应符合石油化工企业钢管尺寸系列（SH3405）的规定。2.3 对焊件之间的焊缝间隙按零计算。2.4 有关弯头的连接尺寸均以长半径弯头（L）的基准进行计算；使用短半径弯头（S）时，需要重新计算。2.5 法兰与三通之间的连接尺寸“H”或“J”是以等径三通的尺寸（M值）算出的；使用异径三通时，需重新计算，即三通M值与法兰D值（E值）之和。2.6 平焊法兰之间的连接按单头螺栓考虑，对焊法兰之间的连接按双头螺柱考虑，双头螺柱的螺母为加厚型。3 符号说明3.1 在各个管道连接最小尺寸中使用的符号规定如下：L 长半径（R=1.5DN）90对焊弯头尺寸；S 短半径（R=1DN）90对焊弯头尺寸；D 平焊法兰加短管的最小尺寸；E 对焊法兰的最小尺寸；F 按长半径弯头尺寸和“D”值确定的最小尺寸；G 按长半径弯头和“E”值确定的最小尺寸；H 按等径三通尺寸和“D”值确定的最小尺寸；J 按等径三通尺寸和“E”值确定的最小尺寸；SO 平焊法兰WN 对焊法兰3.2 各类阀门尺寸所使用的符号规定如下：L 分别为“Z41”，“J41”和“H44”型阀门的结构长度；H 为闸阀或截止阀阀杆全开时的高度或止回阀的凸起部高度；D0 手轮直径。4管道连接最小尺寸41DN15承插件配管连接最小尺寸 单位：mm 压力等记 号 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