Water Transport Pumps from KSB
Water Transport Pumps from KSB
The term “water transport” covers a wide range of applications! It can refer to the movement of large volumes of water from treatment plants to consumers in a municipal water supply system, the circulation of process or cooling water in an industrial plant, the supply of water to high-rise buildings or many other vital applications that centre on getting water to where it is needed.
Pumps are at the heart of water transport systems and selecting the best pump configuration can be a challenge. The aim of this article is to help readers understand some key characteristics of water transport pumps and how these pumps should be configured to meet systems requirements as effectively as possible.
Of course, required capacity and head are the most important parameters for pump selection. In many water transport applications such as municipal water supplies and mines, the need is to move large volumes of water with moderate head requirements. For these tasks, large single-stage centrifugal pumps are the preferred choice. KSB’s RDLO and Omega families of pumps are an excellent example of this type of pump, offering capacities of up to 10,000 cubic metres/hour and heads as high as 240 m. At the other end of the capacity spectrum, KSB’s highly adaptable, easy-to-install Movitec line of pumps are very good choices for systems that require delivery rates of less than 120 m3/hr. Between these extremes, KSB offers an extensive variety of reliable, highly efficient, low-maintenance pumps.
Energy efficiency: the key to cost savings
Because energy costs are typically a large part of the operating budget for water transport systems, optimizing energy efficiency is extremely important. KSB provides a good start in this area by optimizing hydraulic elements of the pump for industry-leading levels of energy efficiency.
System designers are sometimes tempted to specify pump with excess capacity ‘just in case’ demand increases. However, operating large pumps at capacities significantly below their optimum duty point wastes energy and even increase maintenance requirements. For water transport systems with substantial variations in flow requirements, an arrangement that features a number of separately controlled smaller pumps that work in parallel can deliver significantly lower operating costs. Pump suppliers like KSB collaborate closely with system designers and end users to find the most efficient and cost-effective solution. The concepts or ‘life cycle cost’ and ‘total cost of ownership’ are becoming more important to decision makers as energy costs rise and the cost of down time become more significant for high performance water supply systems.
Getting the details right
KSB pumps are typically available in a variety of materials (cast iron, cast steel, or stainless steel for casings, steel, stainless steel or bronze for impellers). There are often a variety of seal types and materials available. This range of options is offered so that pumps from KSB can be relied on to operate reliably under even the most challenging conditions. For example, special corrosion-resistant materials, while initially more expensive, can significantly increase service lives and reduce maintenance costs for pumps required to handle seawater, brackish groundwater or water from other sources with high mineral or chloride ion content.
For most water transport applications, a pump impeller optimized for energy efficiency characteristics is a good choice. However, where the water is mixed with abrasive solids, fibrous material or has a high level of dissolved gases, specialized impellers designed to handle these demanding conditions might be worth considering.
KSB engineering support
KSB’s EasySelect web-based tool is a great place to start for customers in the market for a pump. However, in order to be assured of the optimum solution for a demanding application, it’s best to work with one of KSB’s experienced application engineers.