Torishima – Flood control and fish friendly pumps
Torishima is a leading pump manufacturer, founded in 1919 in Osaka, Japan with European headquarters in Glasgow. Our main objective is to contribute to society as a quality supplier of pumping equipment and services.
Our mission is to listen to our customers, understand their needs and meet their expectations. Therefore, we focus on maintaining a continuous investment in research and development to offer a technology based on efficiency, safety and reliability applied to our customers’ projects and linked to our commitment to the environment, in different industries.
At Torishima we are aware of the increase in flooding worldwide due to global warming and the devastating impacts this has on human communities and ecosystems.
This is leading to an increase in the flood control market both internationally and nationally. The UK has an extensive network of drainage systems and pumping stations to effectively manage excess water during periods of heavy rainfall or river flooding. Many of these pumping systems can create strong water currents, turbulence and pressure changes that can harm fish, especially during the water intake process. This is why there is now a growing awareness of the importance of ensuring minimal negative impact on aquatic ecosystems during the pumping process and water management.
Given our experience in pumping equipment for over 100 years and our philosophy of promoting sustainable water management practices, Torishima has developed innovative technology to offer pumping equipment that solves this problem without losing the desired efficiency.
The specific elements of a pump to achieve ” Fish-Friendly status can be briefly summarised as follows:
- 1. Relatively low impeller peripheral speed.
2. Minimum number of impeller vanes
3. Substantially Increased spatial clearances between the impeller and guide-vane casing. Any static vane, of whatever angle that is located closely behind the rotating impeller is a potential shearing surface and threat to fish.
4. Internal areas which might trap debris are to be avoided. Static diffuser vanes should be so designed as to not trap vegetation and other suspended solids.
As part of the wider scope of the specific application:
- 5. Pump operation in area of stable performance. Given the very nature of the application requires relatively high specific speed pumps, flow range tends to be 70%-120% of BEP.
6. Calculations of “Blade Strike” probability is a key feature of the new NEN 8775 Specification.
7. Pipework and outlet designs must also be considered to optimise velocity and trajectory.
8. Pump start and stop sequences to be evaluated and parameters adjustable to suit site and seasonal particulars.
At Torishima we rely on our mission ” evolving to meet the demands of an ever-changing world” to provide solutions to the various challenges currently faced in different industries. If you would like to know more about this technology, and the other products and services we offer at Torishima, please contact us.
Email: general@torishima.co.uk
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