压力管道各种壁厚计算及校核

输气管道轴向、径向、当量应力计算,,,,,,,,,,,,,,,,,

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P,设计内压,,4,MPa,,,当量应力校核,,,屈服强度,环向应力,轴向应力,当量应力,,,,

D,管子外径,,101.6,cm,,,管外径mm,壁厚mm,设计压力MPa,σs,σh,σL,σe,,0.9ss,结果,

σs,屈服强度,,415,MPa,373.5,,1016,19.5,4,415,100,105,-5,<,374,校核合格,

φ,焊缝系数,,1,,,,711,9.5,10,450,364,184,180,<,405,校核合格,

F,设计系数,,0.3,,,,457,5.6,3.9,320,155,121,34,<,288,校核合格,

t,温度系数,,1,,,,273.1,6.4,4,290,81,99,-18,<,261,校核合格,

E,钢材弹性模量,,192000,MPa,GB50316,,219.1,5.6,4,290,74,97,-23,<,261,校核合格,

a,钢材线膨胀系数,,0.00001112,℃－1,GB50316,,114.3,4,4,290,53,91,-38,<,261,校核合格,

t1,管道安装温度,,50,oC,,,,,,,,,,,,,

t2,管道运行温度,,15,oC,,,径向稳定性校核,,单位管长截面惯性距（m4/m）,土壤变形模量N/m2,基床系数,竖向载荷,变形滞后系数,水平方向变形量,,,

μ,泊松系数,,0.3,,,,管外径m,壁厚m,I,Es,K,W,Z,Dx,,0.03D,结果

dn=,选用壁厚,,1.95,cm,,,1.016,0.0175,4.46615E-07,2.8,0.103,0.026,1.5,0.005,<,0.030,校核合格

,,,,,,,0.457,0.0071,2.98259E-08,2.8,0.103,0.026,1.5,0.006,<,0.014,校核合格

dn=,计算壁厚,,1.63,cm,,,0.457,0.0087,5.48752E-08,2.8,0.103,0.026,1.5,0.004,<,0.014,校核合格

σL,轴向应力,,104.8,MPa,,,0.711,0.014,2.28667E-07,2.8,0.108,0.283,1.5,0.040,<,0.021,不合格

σh,环向应力,,100.2,MPa,,,0.4064,0.0087,5.48752E-08,2.8,0.103,0.035,1.5,0.004,<,0.012,校核合格

σe,当量应力,,-4.6,<0.9σs，校核合格,,,,,,,,,,,,,

,,,,,,,W=rt.hc.g.10-6MPa,,,,,,,,,,

注：所用公式为“输气管道工程设计规范（GB50251-2003)P52”。,,,,,,,rt－土壤密度kg/m3(1700~1800kg/m3),,,,,,,,,,

σL=μσh＋Eα(t1-t2),,σh=Pd/(2dn),,,,,hc－管线中心埋深mhc=