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2018-10-16View Original

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pérdida de pres压算多少合适?
Reply #22018-10-16
2
Reply #32018-10-16
3 mm/m33从码头输送焦油到焦油罐,泵流量3 m³/h;管径DN未给定,路程360米,落差3米(码头低),弯头8个;焦油参数:粘度值(常温)3 m㎡/s比重1
Reply #42018-10-16
3
Reply #52018-10-16
如果中间有高点或者爬坡,尤其是靠近码头的位置,那么扬程 就不要减掉 落差30米了
Reply #62018-10-16
是连续的坡度,比较平稳,没有突发的爬坡!
Reply #72018-10-16
算了下 出口压力按2.5MPa应该可以了
Reply #82018-10-16
你是怎么算的?求指教!
Reply #92018-10-16
本帖最后由 bfdlwolf 于 2018-10-16 14:51 编辑 如果泵流量300m3/h为正常值,管道总压降2.06MPa,百米压降48.9KPa,流速2.653m/s,通常泵的额定流量取正常流量的1.2倍,此时管道总压降2.74MPa,泵的出口压力取2.74MPa,按照规范管道设计压力为2.74MPa.顺便说一下,管径选择偏小,设计不经济。
Reply #102018-10-16
本帖最后由 bfdlwolf 于 2018-10-16 15:27 编辑 从码头输送焦油到焦油罐,码头低,不应该减落差。泵出口压力=管道总阻力降+高差
Reply #112018-10-17
码头是低30米不是高30米
Reply #122018-11-08
按进出口容器为常压,需要247m的扬程,这么长的距离,管径小,流速太大了
Reply #132018-11-09
建议把管路调到dn250, 管阻52米,阀门类型不知道所以粗略估算,加弯头8个损失共五米,落差30米,共87米,1.1的系数,95米扬程,足够了。估算110千瓦电机就够了,否则电机至少翻翻,长期运转电费可观啊,泵也复杂,维护复杂,成本高高
Reply #142018-11-13
分别计算流体在直管道,弯头和阀门的压头损失再加上高度落差,即总的压头损失。然后再选择对应泵的扬程。

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