管道口径、流速、压力、流量之间的计算公式

1、Sheet1第1页已已知知流流量量、压压力力、流流速速 求求管管径径1 流量Q(Nm3/h)3002 压力P1min(bar)13 流速V(m/s)30.4 4 进进口口管管径径DN(mm)DN(mm)4 42 2已已知知流流量量、压压力力、管管径径 求求流流速速1 流量Q(Nm3/h)20002 压力P1min(bar)13 管径DN(mm)1254 4 流流速速V(m/s)V(m/s)2 22 2. .5 59 92 2已已知知流流速速、压压力力、管管径径 求求流流量量1 流速V(m/s)1.22 压力P1min(bar)0.143 管径DN(mm)1004 4 流流量量Q(Nm3/h)Q

2、(Nm3/h)3 39 9流量、流速、截面积、水压之间的关系式:Q=*A*(2*P/)0.5式中Q流量，m3/S流量系数，与阀门或管子的形状有关；0.6-0.65A面积，m2P通过阀门前后的压力，单位Pakg/m2流体的密度，Kg/m3计算公式1：1/4管径的平方（毫米单位换算成米单位）经济流速（DN300以下管选1.2m/s、DN300以上管选1.5m/s）流量、流速、截面积、水压之间的关系式:Q=*A*(2*P/)0.5式中Q流量，m3/S流量系数，与阀门或管子的形状有关；0.6-0.65 A面积，m2 P通过阀门前后的压力，单位Pakg/m2 流体的密度，Kg/m3A.已知管的内径12m

3、m，外径14mm，公差直径13mm截面积）计算公式1：1/4管径的平方（毫米单位换算成米单位）经济流速（DN300以下管选1.2m/s、DN300以上管选1.5m/s）计算公式2：一般取水的流速1-3米/秒，按1.5米/秒算时：DN=SQRT（4000q/u/3.14)流量q，流速u，管径DN。开平方SQRT。关于管径、压力、流速、流量之间关系的计算第一种情况不涉及压力，知道管径、流速、流量三者中的两者，就可以根据几何原理得出公式，第二种情况，知道压力和管径，凭感觉流量应该是确定的，有没有什么公式可以计算？第二种情况，知道压力和管径，管道长度，这里压力应是管道两端的压强差，计算如下：管道摩阻S

4、=10.3n2/d5.33 ,式中n管内壁糙率，d管内径，以m代入；水头差H=P/(g)，式中P管道两端压强差；液体密度；g重力加速度；流量Q=H/(SL)(0.5)，式中H管道两端水头差，以m为单位；L管道长度，以m为单位；Q流量，以m3/s为单位。管道流速V=4Q/（3.1416d2），式中V流速，以m/s为单位Q、d同上。0已知管径、压力，能确定流速、流量吗？悬赏分：0 -解决时间：2009-6-1 11:43我们已知了管道的管径及压力，有没有公式可以得到流速跟流量？在线等问问题题补补充充：按你这么说，压力的平方等于密度乘以流速的平方啊？你确定吗?后面的2R不是周长吗？乘以流速是什么概念

5、，应该是面积乘以流速吧最最佳佳答答案案还要知道管长及进出口的压力。设管长为L，水平铺设，管道起端压强为P，出口通大气为大气压。管内径为D，管内壁粗糙度为n，比阻为S，速度为VQ，密度为p,则可计算如下：比阻为S=10.3n2 / D流量Q=P/（pgSL）(1/2)Sheet1第2页已知流速、压力、管径 求流量d5.33,按计算器即可，比如说d=200mm=0.2m,则d5.33=0.25.33，在计算器上先按0.2，再按计算器上的键，再按5.33，最后按=号键，即得d5.33=0.25.33=1.8814*10（-4关于管径、压力、流速、流量之间关系的计算第一种情况不涉及压力，知道管径、流速

6、、流量三者中的两者，就可以根据几何原理得出公式，第二种情况，知道压力和管径，凭感觉流量应该是确定的，有没有什么公式可以计算？第二种情况，知道压力和管径，管道长度，这里压力应是管道两端的压强差，计算如下：管道摩阻S=10.3n2/d5.33 ,式中n管内壁糙率，d管内径，以m代入；水头差H=P/(g)，式中P管道两端压强差；液体密度；g重力加速度；流量Q=H/(SL)(0.5)，式中H管道两端水头差，以m为单位；L管道长度，以m为单位；Q流量，以m3/s为单位。管道流速V=4Q/（3.1416d2），式中V流速，以m/s为单位Q、d同上。0已知管径、压力，能确定流速、流量吗？悬赏分：0 -解决时

7、间：2009-6-1 11:43我们已知了管道的管径及压力，有没有公式可以得到流速跟流量？在线等问问题题补补充充：按你这么说，压力的平方等于密度乘以流速的平方啊？你确定吗?后面的2R不是周长吗？乘以流速是什么概念，应该是面积乘以流速吧最最佳佳答答案案还要知道管长及进出口的压力。设管长为L，水平铺设，管道起端压强为P，出口通大气为大气压。管内径为D，管内壁粗糙度为n，比阻为S，速度为VQ，密度为p,则可计算如下：比阻为S=10.3n2 / D流量Q=P/（pgSL）(1/2)水水流流量量的的计计算算公公式式在管内流动的水的流量（m3/s）=水的速度(m/s) 乘以 管子的截面积(m2) 注注：1

8、m3=1000L 1h=3600s一般工程计算，水压力通常为0.106MPa，水在水管中的流速一般取1.5m/s,气体公式与水一样，只是气体常取速度为30m/s管管径径/ /流流速速/ /流流量量对对照照表表 1 1管管径径单单位位：DNDN 流流速速单单位位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管径管管 道道 管管 径径 规规 格格 大大 小小（DNDN） 流量20253240506580100125150200流速0.10.110.180.290.450.711.191.812.834.426.3611.310.20.

9、230.350.580.901.412.393.625.658.8412.7222.620.30.340.530.871.362.123.585.438.4813.2519.0933.930.40.450.711.161.812.834.787.2411.3117.6725.4545.240.50.570.881.452.263.535.979.0514.1422.0931.8156.550.60.681.061.742.714.247.1710.8616.9626.5138.1767.860.70.791.242.033.174.958.3612.6719.7930.9344.5379.17

10、0.80.901.412.323.625.659.5614.4822.6235.3450.8990.480.91.021.592.614.076.3610.7516.2925.4539.7657.26101.7911.131.772.904.527.0711.9518.1028.2744.1863.62113.101.11.241.943.184.987.7813.1419.9131.1048.6069.98124.411.21.362.123.475.438.4814.3421.7133.9353.0176.34135.721.31.472.303.765.889.1915.5323.523

11、6.7657.4382.70147.031.41.582.474.056.339.9016.7225.3339.5861.8589.06158.341.51.702.654.346.7910.6017.9227.1442.4166.2795.43169.651.61.812.834.637.2411.3119.1128.9545.2470.69101.79180.961.71.923.004.927.6912.0220.3130.7648.0775.10108.15192.271.82.043.185.218.1412.7221.5032.5750.8979.52114.51203.581.9

12、2.153.365.508.6013.4322.7034.3853.7283.94120.87214.8822.263.535.799.0514.1423.8936.1956.5588.36127.23226.192.12.383.716.089.5014.8425.0938.0059.3892.78133.60237.502.22.493.896.379.9515.5526.2839.8162.2097.19139.96248.812.32.604.066.6610.4016.2627.4841.6265.03101.61146.32260.122.42.714.246.9510.8616.

13、9628.6743.4367.86106.03152.68271.43管管径径/ /流流速速/ /流流量量对对照照表表 2 2管管径径单单位位：DNDN 流流速速单单位位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管径管管 道道 管管 径径 规规 格格 大大 小小（DNDN） 流量20253240506580100125150200流速2.52.834.427.2411.3117.6729.8645.2470.69110.45159.04282.742.62.944.597.5311.7618.3831.0647.0573.51

14、114.86165.40294.052.73.054.777.8212.2119.0932.2548.8676.34119.28171.77305.362.83.174.958.1112.6719.7933.4550.6779.17123.70178.13316.672.93.285.128.4013.1220.5034.6452.4882.00128.12184.49327.9833.395.308.6913.5721.2135.8454.2984.82132.54190.85339.293.13.515.488.9814.0221.9137.0356.1087.65136.95197.21

15、350.603.23.625.659.2614.4822.6238.2357.9190.48141.37203.58361.913.33.735.839.5514.9323.3339.4259.7293.31145.79209.94373.223.43.856.019.8415.3824.0340.6261.5296.13150.21216.30384.533.53.966.1910.1315.8324.7441.8163.3398.96154.63222.66395.843.64.076.3610.4216.2925.4543.0165.14101.79159.04229.02407.153

16、.74.186.5410.7116.7426.1544.2066.95104.62163.46235.38418.463.84.306.7211.0017.1926.8645.3968.76107.44167.88241.75429.773.94.416.8911.2917.6427.5746.5970.57110.27172.30248.11441.0844.527.0711.5818.1028.2747.7872.38113.10176.71254.47452.394.14.647.2511.8718.5528.9848.9874.19115.92181.13260.83463.704.2

17、4.757.4212.1619.0029.6950.1776.00118.75185.55267.19475.014.34.867.6012.4519.4530.3951.3777.81121.58189.97273.55486.324.44.987.7812.7419.9131.1052.5679.62124.41194.39279.92497.634.55.097.9513.0320.3631.8153.7681.43127.23198.80286.28508.944.65.208.1313.3220.8132.5254.9583.24130.06203.22292.64520.254.7

18、5.328.3113.6121.2633.2256.1585.05132.89207.64299.00531.564.85.438.4813.9021.7133.9357.3486.86135.72212.06305.36542.87管管径径/ /流流速速/ /流流量量对对照照表表 3 3管管径径单单位位：DNDN 流流速速单单位位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管径管管 道道 管管 径径 规规 格格 大大 小小（DNDN） 流量20253240506580100125150200流速4.95.548.6614.19

19、22.1734.6458.5388.67138.54216.48311.72554.1855.658.8414.4822.6235.3459.7390.48141.37220.89318.09565.495.15.779.0114.7723.0736.0560.9292.29144.20225.31324.45576.805.25.889.1915.0623.5236.7662.1294.10147.03229.73330.81588.115.35.999.3715.3523.9837.4663.3195.91149.85234.15337.17599.425.46.119.5415.6324

20、.4338.1764.5197.72152.68238.56343.53610.735.56.229.7215.9224.8838.8865.7099.53155.51242.98349.89622.045.66.339.9016.2125.3339.5866.90101.34158.34247.40356.26633.355.76.4510.0716.5025.7940.2968.09103.14161.16251.82362.62644.655.86.5610.2516.7926.2441.0069.29104.95163.99256.24368.98655.965.96.6710.431

21、7.0826.6941.7070.48106.76166.82260.65375.34667.2766.7910.6017.3727.1442.4171.68108.57169.65265.07381.70678.586.16.9010.7817.6627.6043.1272.87110.38172.47269.49388.07689.896.27.0110.9617.9528.0543.8374.06112.19175.30273.91394.43701.206.37.1311.1318.2428.5044.5375.26114.00178.13278.33400.79712.516.47.

22、2411.3118.5328.9545.2476.45115.81180.96282.74407.15723.826.57.3511.4918.8229.4145.9577.65117.62183.78287.16413.51735.136.67.4611.6619.1129.8646.6578.84119.43186.61291.58419.87746.446.77.5811.8419.4030.3147.3680.04121.24189.44296.00426.24757.756.87.6912.0219.6930.7648.0781.23123.05192.27300.41432.607

23、69.066.97.8012.1919.9831.2148.7782.43124.86195.09304.83438.96780.3777.9212.3720.2731.6749.4883.62126.67197.92309.25445.32791.687.18.0312.5520.5632.1250.1984.82128.48200.75313.67451.68802.997.28.1412.7220.8532.5750.8986.01130.29203.58318.09458.04814.30管管径径/ /流流速速/ /流流量量对对照照表表 4 4管管径径单单位位：DNDN 流流速速单单位

24、位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管径管管 道道 管管 径径 规规 格格 大大 小小（DNDN） 流量20253240506580100125150200流速7.38.2612.9021.1433.0251.6087.21132.10206.40322.50464.41825.617.48.3713.0821.4333.4852.3188.40133.91209.23326.92470.77836.927.58.4813.2521.7133.9353.0189.59135.72212.06331.34477.1384

25、8.237.68.6013.4322.0034.3853.7290.79137.53214.88335.76483.49859.547.78.7113.6122.2934.8354.4391.98139.34217.71340.18489.85870.857.88.8213.7822.5835.2955.1393.18141.15220.54344.59496.21882.167.98.9313.9622.8735.7455.8494.37142.96223.37349.01502.58893.4789.0514.1423.1636.1956.5595.57144.76226.19353.43

26、508.94904.788.19.1614.3123.4536.6457.2696.76146.57229.02357.85515.30916.098.29.2714.4923.7437.1057.9697.96148.38231.85362.26521.66927.408.39.3914.6724.0337.5558.6799.15150.19234.68366.68528.02938.718.49.5014.8424.3238.0059.38100.35152.00237.50371.10534.38950.028.59.6115.0224.6138.4560.08101.54153.81

27、240.33375.52540.75961.338.69.7315.2024.9038.9160.79102.73155.62243.16379.94547.11972.648.79.8415.3725.1939.3661.50103.93157.43245.99384.35553.47983.958.89.9515.5525.4839.8162.20105.12159.24248.81388.77559.83995.268.910.0715.7325.7740.2662.91106.32161.05251.64393.19566.191006.57910.1815.9026.0640.726

28、3.62107.51162.86254.47397.61572.561017.889.110.2916.0826.3541.1764.32108.71164.67257.30402.03578.921029.199.210.4016.2626.6441.6265.03109.90166.48260.12406.44585.281040.509.310.5216.4326.9342.0765.74111.10168.29262.95410.86591.641051.819.410.6316.6127.2242.5266.44112.29170.10265.78415.28598.001063.1

29、19.510.7416.7927.5142.9867.15113.49171.91268.61419.70604.361074.429.610.8616.9627.7943.4367.86114.68173.72271.43424.12610.731085.739.710.9717.1428.0843.8868.57115.88175.53274.26428.53617.091097.049.811.0817.3228.3744.3369.27117.07177.34277.09432.95623.451108.359.911.2017.4928.6644.7969.98118.26179.1

30、5279.92437.37629.811119.661011.3117.6728.9545.2470.69119.46180.96282.74441.79636.171130.97管管径径流流速速推推荐荐安安全全值值管径(DN)流流速速推推荐荐值值m/s:20253240506580100125150闭式系统 0.5-0.6 0.6-0.7 0.7-0.90.8-10.9-1.2 1.1-1.4 1.2-1.6 1.3-1.8 1.5-2.01.6-2.2开式系统 0.4-0.5 0.5-0.6 0.6-0.8 0.7-0.9 0.8-1.0 0.9-1.2 1.1-1.4 1.2-1.6 1

31、.4-1.81.5-2.025030035040045050060017.6725.4534.6445.2457.2670.69101.7935.3450.8969.2790.48114.51141.37203.5853.0176.34103.91135.72171.77212.06305.3670.69101.79138.54180.96229.02282.74407.1588.36127.23173.18226.19286.28353.43508.94106.03152.68207.82271.43343.53424.12610.73123.70178.13242.45316.67400.

32、79494.80712.51141.37203.58277.09361.91458.04565.49814.30159.04229.02311.72407.15515.30636.17916.09176.71254.47346.36452.39572.56706.861017.88194.39279.92381.00497.63629.81777.541119.66212.06305.36415.63542.87687.07848.231221.45229.73330.81450.27588.11744.32918.921323.24247.40356.26484.90633.35801.58

33、989.601425.03265.07381.70519.54678.58858.831060.291526.81282.74407.15554.18723.82916.091130.971628.60300.41432.60588.81769.06973.341201.661730.39318.09458.04623.45814.301030.601272.351832.18335.76483.49658.09859.541087.851343.031933.96353.43508.94692.72904.781145.111413.722035.75371.10534.38727.3695

34、0.021202.371484.402137.54388.77559.83761.99995.261259.621555.092239.33406.44585.28796.631040.501316.881625.772341.11水水流流量量的的计计算算公公式式在管内流动的水的流量（m3/s）=水的速度(m/s) 乘以 管子的截面积(m2) 注注：1m3=1000L 1h=3600s一般工程计算，水压力通常为0.106MPa，水在水管中的流速一般取1.5m/s,气体公式与水一样，只是气体常取速度为30m/s管管径径/ /流流速速/ /流流量量对对照照表表 1 1管管径径单单位位：DNDN 流

35、流速速单单位位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管管 道道 管管 径径 规规 格格 大大 小小（DNDN）424.12610.73831.271085.731374.131696.462442.90250300350400450500600441.79636.17865.901130.971431.391767.152544.69459.46661.62900.541176.211488.641837.832646.48477.13687.07935.171221.451545.901908.522748.27494.

36、80712.51969.811266.691603.151979.202850.05512.47737.961004.451311.931660.412049.892951.84530.14763.411039.081357.171717.672120.583053.63547.82788.851073.721402.411774.922191.263155.42565.49814.301108.351447.651832.182261.953257.20583.16839.751142.991492.881889.432332.633358.99600.83865.191177.631538

37、.121946.692403.323460.78618.50890.641212.261583.362003.942474.003562.57636.17916.091246.901628.602061.202544.693664.35653.84941.541281.531673.842118.452615.383766.14671.52966.981316.171719.082175.712686.063867.93689.19992.431350.811764.322232.972756.753969.72706.861017.881385.441809.562290.222827.43

38、4071.50724.531043.321420.081854.802347.482898.124173.29742.201068.771454.711900.042404.732968.814275.08759.871094.221489.351945.272461.993039.494376.87777.541119.661523.991990.512519.243110.184478.65795.221145.111558.622035.752576.503180.864580.44812.891170.561593.262080.992633.753251.554682.23830.5

39、61196.001627.892126.232691.013322.234784.02848.231221.451662.532171.472748.273392.924885.80250300350400450500600管管径径/ /流流速速/ /流流量量对对照照表表 2 2管管径径单单位位：DNDN 流流速速单单位位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管管 道道 管管 径径 规规 格格 大大 小小（DNDN）管管径径/ /流流速速/ /流流量量对对照照表表 3 3管管径径单单位位：DNDN 流流速速单单位位：m/s

40、m/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管管 道道 管管 径径 规规 格格 大大 小小（DNDN）865.901246.901697.172216.712805.523463.614987.59883.571272.351731.802261.952862.783534.295089.38901.241297.791766.442307.192920.033604.985191.17918.921323.241801.082352.422977.293675.665292.96936.591348.691835.712397.663

41、034.543746.355394.74954.261374.131870.352442.903091.803817.045496.53971.931399.581904.982488.143149.053887.725598.32989.601425.031939.622533.383206.313958.415700.111007.271450.471974.262578.623263.564029.095801.891024.941475.922008.892623.863320.824099.785903.681042.621501.372043.532669.103378.08417

42、0.466005.471060.291526.812078.162714.343435.334241.156107.261077.961552.262112.802759.573492.594311.846209.041095.631577.712147.442804.813549.844382.526310.831113.301603.152182.072850.053607.104453.216412.621130.971628.602216.712895.293664.354523.896514.411148.641654.052251.342940.533721.614594.5866

43、16.191166.321679.502285.982985.773778.864665.276717.981183.991704.942320.623031.013836.124735.956819.771201.661730.392355.253076.253893.384806.646921.561219.331755.842389.893121.493950.634877.327023.341237.001781.282424.523166.734007.894948.017125.131254.671806.732459.163211.964065.145018.697226.921

44、272.351832.182493.803257.204122.405089.387328.712503003504004505006001290.021857.622528.433302.444179.655160.077430.491307.691883.072563.073347.684236.915230.757532.281325.361908.522597.703392.924294.165301.447634.071343.031933.962632.343438.164351.425372.127735.861360.701959.412666.983483.404408.68

45、5442.817837.651378.371984.862701.613528.644465.935513.507939.431396.052010.312736.253573.884523.195584.188041.221413.722035.752770.883619.114580.445654.878143.01管管径径/ /流流速速/ /流流量量对对照照表表 4 4管管径径单单位位：DNDN 流流速速单单位位：m/sm/s 流流量量单单位位：m m3 3/h/h 圆圆周周率率（）：3.14159263.1415926管管 道道 管管 径径 规规 格格 大大 小小（DNDN）1431.

46、392061.202805.523664.354637.705725.558244.801449.062086.652840.163709.594694.955796.248346.581466.732112.092874.793754.834752.215866.928448.371484.402137.542909.433800.074809.465937.618550.161502.072162.992944.063845.314866.726008.308651.951519.752188.432978.703890.554923.986078.988753.731537.422213

47、.883013.343935.794981.236149.678855.521555.092239.333047.973981.035038.496220.358957.311572.762264.773082.614026.275095.746291.049059.101590.432290.223117.254071.505153.006361.739160.881608.102315.673151.884116.745210.256432.419262.671625.772341.113186.524161.985267.516503.109364.461643.452366.56322

48、1.154207.225324.766573.789466.251661.122392.013255.794252.465382.026644.479568.031678.792417.463290.434297.705439.276715.159669.821696.462442.903325.064342.945496.536785.849771.611714.132468.353359.704388.185553.796856.539873.401731.802493.803394.334433.425611.046927.219975.181749.472519.243428.9744

49、78.655668.306997.9010077.01767.152544.693463.614523.895725.557068.5810178.82002503003504001.8-2.51.8-2.61.9-2.91.6-2.51.8-2.61.6-2.31.7-2.41.7-2.41.6-2.11.8-2.3管管径径流流速速推推荐荐安安全全值值流流速速推推荐荐值值m/s:水水压压在在0.2mpa，流流量量是是15立立方方每每小小时时，要要用用的的管管径径是是多多少少0.2Mpa的水压全部转换为动能，速度为20m/s，体积流量为15 m3/h，可换算为0.0042m3/s，则管路面积为

50、0.0042 / 20 = 0.00021 m2=210 mm2，管路直径为16.3mm，考虑到压力损失，选择20mm的管路就差不多了 流流量量=流流速速*流流通通面面积积。而而根根据据管管道道水水流流量量计计算算公公式式Q=（H/sL）1/2流流量量与与管管道道长长度度存存在在关关系系，请请问问怎怎么么理理解解？流量=流速*过流面积根据管道水流量计算公式Q=VXSV-液体流动的流速S-过流断面的面积L-是流量的单位为每秒升流量与管道长度不存在关系。它指的是单位时间内通过某一断面液体的数量，与长度没有关系DN15、DN25、DN50管管道道的的流流量量各各为为多多少少？DN15、DN25、DN50管径的截面积分别为：DN15：15*3.14/4=176.625平方毫米，合0.0177平方分米。DN25：25*3.14/4=490.625平方毫米，合0.0491平方分米。DN50：50*3.14/4=1962.5平方毫米，合0.1963平方分米。 设管道流速为V=4米/秒，即V=40分米/秒，且1升=1立方分米，则管道的流量分别为（截面积乘以流速）：DN15管道：流量Q=0.0177*40=0.708升/秒，合2.55立方米/小时。DN25管道：流量Q=0.0491*40=1.964升/秒，合7.07立