By Ron Palgrave
Pumps are tremendous until eventually they malfunction or holiday down. while that occurs, the 1st precedence is to get the pump functioning back and to maintain ''down time'' to a minimal. Many difficulties may be clinically determined and rectified utilizing a mix of data and event, the latter coming through the years. This booklet, written through an skilled engineer, publications the reader via diagnostic pathways resulting in logical factors for the malfunctions and their correction.
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Additional info for Troubleshooting Centrifugal Pumps and their Systems
Sample text
4. In system terms, the only effect this has is to slide the previously calculated system curve upward by an amount equal to the level difference. This additional 'lifting component' is called the static head, or static lift. The example just described shows a combination if friction and static head. The ratio of friction head to total head is called the friction ratio, and is a characteristic feature of the particular system. 4 Featuresof Static and friction system. ====================== ........
Pump churning would result. 17. This gives a new curve for the combined efforts of all pumps. The interaction of the systems curve and the combined pump curve is at point [1]. This describes the total head in the system, comprised of head [3] plus head [2]. If only pump B operates, then the system head-flow is point [5]. If only pump A operates, then the system head-flow is point [4]. In this example, the two pumps have different characteristics. 18. In this case, the combined head is [1] each pump delivering [2].
This simple example helps give some sense of the complexity in system response when multiple pump and systems are operated Pipe work design details Some attention to the detailed design of the pipe work can help avoid problems at a later date. The following notes may be useful. Suction piping Avoid air traps The pipe may be fully connected, and the entry fully submerged, but the pipe run may permit collection of an air or gas pocket. This will occur if instead of continuously rising towards the pumps, there is a 'hump' or high spot where air can collect in the suction line.
