Roper Pumps：对比3600 EVO 泵与 AOD泵
(鼎恒石油资讯) 对泵系统进行总成本分析时，容易被忽视的因素之一就是能量损耗。
而在使用AOD泵时，大多数人都不会考虑压缩空气的高成本。
近，Roper业务员在访问一家正在泵送沥青乳液封层产品的密封涂层制造厂时证实了这一点。当时他们正在使用2寸AOD泵在1000 SSU的50 PSI下转移60 GPM，略带研磨液体。该厂大约每天运行8小时，每年50周(2000小时/年)。
工厂经理对3600 EVO与隔膜泵进行对比后，对高采购成本开始有一些疑虑。然而，在进行能源消耗比较时，只要经过一年运营后，3600 EVO就变得相对较为划算。
为了进行计算，我们使用了一些关于空气系统的(大胆)假设。使用的是无泄漏或损耗的125 PSI工厂空气，螺旋压缩机负载92%。AOD泵的等效电动制动马力为17.5 bhp。相反，以545 RPM运行的3611EGHBFRV EVO泵为3.5bhp。假设工业用电每千瓦时为5美分，那么运营商每年将节省超过1,000美元。而这还不包括与隔膜泵相关的其他成本，例如运行空气管路，脉动阻尼器，空气调节器，空气干燥器等。
对比运行EVO泵与气动隔膜泵后发现，大大减少�；奔浜透俚谋讣罂梢允褂没Щ竦酶蟮某杀居攀�。在这个特例中，由于液体的磨损性质，AOD泵润湿部件需要按季度进行更换。包括�；奔湓谀�，每次维修造成的净损失约为1,000美元。而在这个应用中，预计3600 EVO及其极耐磨衬套和轴杆在一年内不需要任何维护。基于这些预期的成本节约，该工厂现在已经用Roper 3600 EVO泵替换了几台AOD泵。
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注：该文章由鼎恒石油编译，转发须注明出处。
附英文原文：
3600 EVO PUMP VS. AOD PUMP
One of the most overlooked factors when doing a total cost analysis on pumping systems is energy consumption.
In the case of AOD pumps, most do not consider the high cost of compressed air.
This was evidenced recently by a Roper salesman when visiting a sealcoat manufacturing plant that was pumping an asphalt emulsion sealcoat product. They were using a 2” AOD pump to transfer 60 GPM at 50 PSI of the 1000 SSU, slightly abrasive liquid. The plant ran the pump roughly 8 hrs./day, 50 weeks per year (2,000 hours/year).
The plant manager had some initial misgivings about the high acquisition cost of the 3600 EVO versus a diaphragm pump. However, when shown the energy consumption comparison, the 3600 EVO was a relative bargain after only one year of operation.
To do the calculation we used some (generous) assumptions about the air system. Using 125 PSI plant air with no leaks or losses, and a screw compressor at 92% loading. The equivalent electrical brake horsepower for the AOD pump was 17.5 bhp. Conversely, a 3611EGHBFRV EVO pump running at 545 RPM had a bhp of 3.5. Assuming an industrial electricity rate of 5¢ per kWh, the operator would save over $1,000 per year! And this speaks nothing of the other costs associated with diaphragm pumps such as running air lines, pulsation dampener, air regulator, air dryer, etc.
An even larger cost benefit that a user could capture by running an EVO pump versus an air operated diaphragm pump is derived from greatly reduced downtime and fewer spare parts requirements. In this particular example, the abrasive nature of the liquid resulted in required replacement of the AOD pump wetted parts roughly quarterly. Including downtime, this resulted in a net loss of approximately $1,000 per repair. In this application, the 3600 EVO with its extreme wear resistant bushings and shafts is expected not to require any maintenance within the year. Based on these anticipated cost savings, the plant has now replaced several AOD pumps with the Roper 3600 EVO.
