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Intro sump design
The basic idea of having the pumps placed in a sump other than handling the inflow variations is to also ensure that optimal inlet conditions are provided for the pumps. This requires that the flow being delivered to the pump units is uniform, steady, and without swirl or entrained air. An incorrectly designed sump could potentially result in poor performance and/or mechanical strain due to vibrations and cavitation at the inlet to the pump(s). Generally, pumps of propeller type are more sensitive to these types of problems in comparison to centrifugal pumps.
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Other requirements on a sump could be:
| The sump should have a design that prevents sedimentation building up. Having a clean sump implies less maintenance problems and costs. | | | | | The sump should be as small as possible in order to minimise the investment cost for constructing the station. | | | | | The design also depends on the magnitude of the incoming flow, levels of the incoming pipe and cycle time for the pumps. How the levels are finally set depends of the design of the sump. |
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In order to handle these requirements during the design process of a sump, Flygt has developed a number of design recommendations as well as software that can support designers, planners' etc with the design of sumps. These brochures and software are detailed in the following sections.
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Engineering
