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["[ "Problème de marge量 d'évaporation du fluide", "Une pompe centrifugee dans une cuve d'huile indsigne avec un m_margin d'évaporation de 4,5 mm. Comment devrais-je contrôlerer la la pressionione d l'entrée ? J'ai demande à un ancien employée qui a visité la fabrique de pompe, et il m'a dit que cela devrait atteindreindre environ - "0 "56 " "MPa. Cepend-ut-er lors de fonctionnement, d, d autres anciens employés m ont dit que la pompee a été vidée." " "À l'époque,,e mèdidiae était l'eau, " " "le niveau dede la liquide dans le réservoir était d l'ordre de 0 "7 " "m." "Le niveau de de l'installation de de de dede la pomme devrait être à peu près au niveau du plande fond du réservoir." " "Pomme centrifugee TSY55 "54 " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " pérdida de d " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " pérdida "

2018-12-27View Original

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油库的某离心泵,写着汽蚀余量4.5米。那我的入口压力应该怎么控制。我问一个去过泵厂家的老员工说差不多可以达到-0.059Mpa。然而我在运行时,入口压在-0.002Mpa后,有其他老员工说泵抽空了。
Reply #22018-12-27
当时介质是水,罐内液位高度在0.7米的样子,泵的安装高度应该和罐底板水平高度差不多
Reply #32018-12-27
单级双吸式离心泵TSY500-400-895 流量2200、扬程90、汽蚀余量4.5。
Reply #42018-12-27
这不是气蚀,是抽空了!
Reply #52018-12-28
正常核算下来,入口应该满足在0.05MPA(G)(绝对压力)以上时,才会发生汽蚀,如果提前发生汽蚀,要么就是泵汽蚀余量数值不准确,要么就是入口有阻碍,造成供液不足
Reply #62018-12-28
但是厂家这边是说可以达到-0.0569Mpa,应该是还要考虑大气压的和水的饱和蒸气压
Reply #72018-12-28
你说的抽空意思是水已经汽化了吗?
Reply #82018-12-28
-0.0596MPA与我这绝对压力0.05MPA也差不多呀
Reply #92018-12-29
入口线的长短,入口阀的开度,关键是入口是否有滤网》(洁净程度)都是影响因素(暂不考虑罐内水温较高的可能~~)~~
Reply #102018-12-29
水还没到汽化阶段,是水源供水不足,这和气蚀两个概念。 有水而因为压力低而抽不上来了(汽化)是气蚀。
Reply #112019-06-23
仅考虑泵入口压力P1≥(1+4.5)*密度*g+Pv,其中Pv-操作液体饱和蒸汽压

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