球墨铸铁管管道压力与壁厚计算表（GBT 13295-2013）

62420.003//37.3//57.5//1668420.003C级管道壁厚计算表(GBT13295-2013)序号口径DN(mm)K9级管道C25级管道插口公称外径(mm)公称壁厚emon(mm)最小壁emin(mm)计算最小壁emin(mm)标准最小壁emin(mm)11001186.04.71.0/21501706.04.71.5/32002226.34.82.0/43003267.25.62.9/54004298.16.43.83.865005329.07.24.74.776006359.98.05.65.7870073810.88.86.56.8980084211.79.67.57.5101000104813.511.29.39.3111200125515.312.811.1/121400146217.114.412.9/131600166818.916.014.8/首选压力等级管emin=(PFA*SF*DE)/(2*Rm+PFA*SF)PFA——允许工作压力,单位为兆帕(MPa)emin——球铁管最小壁厚,单位为毫米(mm)D——球铁管平均直径(DE-emin),mm(见表15)Rm——球铁管最小抗拉强度,单位为兆帕(MPa);(Rm=420MPa)SF——安全系数,取3。最大允许工作压力PMA同PFA,但SF=2.5,因此PMA=1.2PFA最大现场允许试压压力PEA:PEA=1.2PFA+0.5C30级管道公称壁厚emon(mm)计算最小壁emin(mm)标准最小壁emin(mm)公称壁厚emon(mm)/1.3///1.8///2.4///3.53.55.15.54.54.86.56.55.65.77.57.66.76.88.78.87.87.99.99.68.99.011.111.611.111.113.4/13.3///15.5///17.7//