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Pumps for Groundwater Lowering Duties
Published in Pat M. Cashman, Martin Preene, Groundwater Lowering in Construction, 2020
This pump comprises a centrifugal pump of the volute type combined with a separate vacuum pump. A centrifugal pump is a rotodynamic pump where an impeller rotating at high speed pushes water radially outward. The water flung out from the impeller is directed through the tangential outlet of a curved casing (the volute) enclosing the impeller, where the kinetic energy of the water is converted to pressure. Water leaving the central eye of the impeller creates suction, drawing more water to the pump. The separate vacuum pump removes air from the pipework upstream of the impeller to allow the pump to quickly self-prime.
Pumped systems
Published in David Butler, Christopher Digman, Christos Makropoulos, John W. Davies, Urban Drainage, 2018
David Butler, Christopher Digman, Christos Makropoulos, John W. Davies
The most common rotodynamic pump for use with wastewater is a centrifugal pump in which the impeller forces the liquid radially into an outer chamber called a volute (Figure 14.7). In effect, the volute converts velocity head into pressure head. The impeller often has a special design to avoid clogging by solids, and this feature means that centrifugal pumps for wastewater tend to have lower specified efficiencies (about 50% to 70%) than centrifugal pumps for clean water (up to 90%). A common requirement is for these pumps to be capable of handling a 100 mm diameter sphere. They are suitable for a wide range of conditions—a single pump with flow rate 7–700 L/s and head 3–45 m will typically operate at speeds of around 1450 rpm within a range of 400–3000 rpm. Centrifugal pumps require priming (filling with water before pumping can begin) and so must normally be installed below the lowest level of wastewater to be pumped.
Pumped systems
Published in David Butler†, John W. Davies††, Urban Drainage, 2000
David Butler†, John W. Davies††
The most common rotodynamic pump for use with wastewater is a centrifugal pump in which the impeller forces the liquid radially into an outer chamber called a ‘volute’ (Fig. 15.7). In effect, the volute converts velocity head into pressure head. The impeller has a special design to avoid clogging by solids, and this feature means that centrifugal pumps for wastewater tend to have lower efficiencies (about 50 to 60%) than centrifugal pumps for clean water (up to 90%). A common requirement is for these pumps to be capable of handling a 100mm diameter sphere. They are suitable for a wide range of conditions – flow-rate: 7 to 700l/s; and head: 3 to 45m and typically operate at low speeds of around 900rpm. Centrifugal pumps require priming (filling with water before pumping can begin) and so must normally be installed below the lowest level of wastewater to be pumped.
A comprehensive review on fault detection and analysis in the pumping system
Published in International Journal of Ambient Energy, 2022
Nabanita Dutta, Palanisamy Kaliannan, Shanmugam Paramasivam
The movement of fluid from one location to another is the primary function of the pumping system. A rotating impeller is used in the pump to move the fluid using centrifugal force. Pumps can be categorised in various ways, but according to the working principle, they are categorised into two types: rotodynamic pump and positive displacement pump. Centrifugal pump is primarily referred to under the significant contribution of the rotodynamic pumping system and used in large scale in industrial applications, whereas positive displacement pump is more efficient than a centrifugal pump. Still, it has a minimum flow rate and low-pressure head, so it is frequently not used in large industries (Shankar et al. 2016). Polymer , plastic , lubrication oil, small chemical industries where the demand for the pump is low, only positive displacement pumps are used (Figure 1). Pumps are operated in different applications, and according to operational activities, centrifugal pumps are of two types: single-stage pump and multi-stage pump (Waide and Brunner 2011).