API610中空级叶轮指的是什么? 这个是对于多级泵而言的。 预留出来的一级，里面没有叶轮。 如果在出厂之前，设计发生变化，需要泵提供更高的压力，则可以更换为一个完整的叶轮，从而提高压头。 google了一下，国外网站上有这么一段回复，说得是同一个意思，不过老外解释得更有逻辑一些 api 610-2003 5.1.6 pumps shall be capable of at least a 5 % head increase at rated conditions by replacement of the impeller(s) with one(s) of larger diameter or different hydraulic design, variable-speed capability or use of a blank stage. so what does "blank stage" mean here? the api is referring to a multistage pump with one stage a "blank" stage. this means that an extra stage is provided for in the original design, but with no impeller installed. you can then satisfy the requirements of this clause by installing an impeller into that stage at a later date. for a pump with many stages it may be that increasing the casing size to allow for larger impellers at a later stage is not feasible or cost effective, and a blank stage becomes the best alternative. http:///thread ... ge-centrifugal-pump 查看更多
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