Pump life cycle costs

Original publisher: [Washington, DC] : Office of Industrial Technologies, Energy Efficiency and Renewable Energy, U.S. Dept. of Energy ; [Parsippany, NJ] : Hydraulic Institute ; [Brussels, Belgium] : Europump, January 2001. OCLC Number: (OCoLC)47181606 Subject: Energy conservation. Excerpt: ... Executive Summary The following four options are suggested: A. A new control valve can be installed to accommodate the high pressure differential. B. The pump impeller can be trimmed so that the pump does not develop as much head, resulting in a lower pressure drop across the current valve. C. A variable frequency drive ( VFD ) can be installed, and the flow control valve removed. The VFD can vary the pump speed and thus achieve the desired process flow. D. The system can be left as it is, with a yearly repair of the flow control valve to be expected. The cost of a new control valve that is properly sized is 5 000 Euro or USD. The cost of modifying the pump performance by reduction of the impeller diameter is 2 250 3 Euro or USD. The process operates at 80 m / h for 6,000 h / year. The energy cost is 0.08 Euro or USD per kWh and the motor efficiency is 90 %. The cost comparison of the pump system modification options is contained in Table 1. 100 " System curve " option A & D " System curve " option B 80 100 430 mm " System curve " option C 80 60 iency m ead 375 mm impeller ic H Figure 3. Pump and Eff 40 60 system curves % showing the 20 40 operation of the Reduced speed pump original system and the modified 0 20 pump impeller 0 40 80 120 140 160 20 60 100 3 Rate of flow m / hr 13