管道流速选择原则.doc

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1、管道尺寸选择原则一、液体工艺介质类别最大允许压降流速kg/cm2/100mm/s(1)一般0.921.5~4.6液体密度<1600kg/cm21.5~2.4液体密度<800kg/cm21.8~3.0液体密度<320kg/cm23.0~4.6粘度(cp)管径(mm)0.1~0.51.0250.5~1.1500.7~1.51001.0~2.050.0250.5~0.9500.7~1.01001.0~1.6100.0250.3~0.6500.5~0.71000.7~1.02001.2~1.61000.0250.1~0.2500.16~0.251000.25~0.352000.35~0

2、.55(2)泵吸入口饱和液体0.120.6~1.8过冷液体0.231.2~2.4(3)泵排出口0～60m3/h1.381.8~2.460～160m3/h0.922.4~3.0>160m3/h0.463.0~4.6(4)容器、塔器底部排出管线0.141.2~1.8(5)再沸器入口0.030.3~1.2(6)冷凝器出口0.110.9~1.8(7)冷却管线0.090.6~1.2(8)塔器供液管线0.141.2~1.8二、气体工艺介质类别最大允许压降流速kg/cm2/100mm/s(1)一般压力等级>35.0kg/cm2G0.467.0~20.014.0~35.0kg/cm2G0.35

3、7.0~20.010.5~14.0kg/cm2G0.147.0~20.03.5~10.5kg/cm2G0.0710.0~30.00.0~3.5kg/cm2G0.0310.0~30.0真空0.0210.0~30.0换气用风道横置4.0~7.0竖置2.0~5.0排烟烟道内2.0~3.0烟筒内4.0~7.0(2)压缩机进口管线0.1220.0~45.0排出管线0.2310.0~25.0(3)塔器周边管线>2.5kg/cm2G0.046~0.127.0~20.00.0~2.5kg/cm2G0.046~0.1210.0~30.0真空0.012~0.02310.0~30.0三、水类别最大允

4、许压降流速kg/cm2/100mm/s(1)一般0.400.6~4.9口径(mm)250.6~0.9500.9~1.41001.5~2.11502.1~2.72002.4~3.02503.0~3.7300（水力计算表中Vmax为3.00）3.0~4.3400（水力计算表中Vmax为3.02）3.0~4.6450（水力计算表中Vmax为3.02）>500（水力计算表中Vmax为3.00）3.0~4.9600(水力计算表中Vmax为3.01)700(水力计算表中Vmax为3.01)800(水力计算表中Vmax为3.02)900(水力计算表中Vmax为3.02)1000(水力计算表中

5、Vmax为3.00)(2)泵吸入口0.100.5~1.5(3)泵排出口0.401.0~3.0离心泵2.0~3.0往复泵1.0~2.0(4)锅炉给水0.401.5~3.0(5)冷却水0.401.0~2.5四、蒸汽类别最大允许压降流速kg/cm2/100mm/s(1)一般压力等级0.0~3.5kg/cm2G0.0610.0~35.03.5~10.5kg/cm2G0.1210.0~35.010.5~21.0kg/cm2G0.2310.0~35.0>21.0kg/cm2G0.3510.0~35.0(2)过热蒸汽口径(mm)>2000.3540.0~60.0100~2000.3530.0

6、~50.0<1000.3530.0~40.0(3)饱和蒸汽口径(mm)>2000.2030.0~40.0100~2000.2025.0~35.0<1000.2015.0~30.0(4)乏汽排汽管(从受压容器中排出)80.0排汽管(从无压容器中排出)15.0~30.0排汽管(从安全阀排出)200.0~400.0