离心泵排气口？ 气体比液体轻，本身应该能被液体挤得回罐里面去啊？有没有相关的标准有描述的？ 有的，api610有相关章节介绍的有 6.4.3.14 all pumps shall be provided with vent and drain connections, except that vent connections may be omitted if the pump is made self-venting by the arrangement of the nozzles. 除了泵管道的布置能够自排气，放空（排气）管可以省去（不要）外， pumps that are not self-venting shall be provided with vent connections in the pressure casing, as required . if the pump cannot be completely drained for geometrical reasons, this shall be stated in the proposal. the operating manual shall include a drawing indicating the quantity and location(s) of the liquid remaining in the pump. as a guide, a pump is considered functionally self-venting if the nozzle arrangement and the casing configuration permit sufficient venting of gases from the first-stage impeller and volute area to prevent loss of prime during the starting sequence. 6.8.10 provision shall be made to ensure complete venting of the seal chamber. 这些可以找到，对于泵来说一般是需要的。红色部分（类似于楼主布置）时，是可以省去的，很多朋友讨论的很详细了 查看更多
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