Traditional water and wastewater utility systems weren’t built for the dramatically changing stresses of climate change and rapid urbanization. Therefore, the risk that ageing infrastructure brings – both in terms of potential failure and poor environmental compliance – is a key concern for water utilities worldwide.
There is increasing pressure on utility companies to lower their total cost of ownership and high leakage rates. The rapid development of real-time sensing and monitoring technologies to improve early leakage and water quality anomaly detection is an effective way to address these challenges.
By combining smart monitoring technology with drives and motors, water utility operators can secure pre-emptive asset management optimization and, in the process, drive a significant shift from reactive to real-time monitoring.
Condition-based monitoring
Nearly a third of all electric motors in the world are driven by variable speed drives (VSDs), mainly to reduce energy use. However, there are other reasons for employing drives in water and wastewater applications, including process control (keeping constant water pressure, avoiding leakage caused by high pressure), avoiding water hammer, or optimized well exploitation.
Drives can perform pump cleaning in wastewater applications and control several pumps in a cascade system in water pumping applications to optimize pump operations and save energy. Condition-based monitoring services can work alongside all these water automation products to access real-time data via the cloud from remotely located water assets.
At the heart of this approach is a new generation of smart wireless sensors – a low-cost, easy-to-install digital solution. Smart sensors have revolutionized motors’ maintenance logistics by enabling operators to use remote monitoring for the early detection of incipient problems. Now, maintenance actions can be cost-effectively planned before functional failure. The result is reduced downtime, eliminating unexpected production stops, optimized maintenance, and reduced spare parts stock.
With built-in intelligence for live, adaptive behavior, the technology assists in managing the effects of extreme weather conditions such as excess rainfall that poses problems from water quality to environmental compliance. Furthermore, the digital solution allows experts to analyze data collected from the sensors and turn it into corrective and confident actions to extend equipment lifetime. It’s possible to analyze and decipher the best solution for improving the operation of water and wastewater assets, from a single pump station to entire water or wastewater treatment facility.
In focus:
Sensors can also turn traditional pumps into smart, wirelessly connected devices. This approach measures vibration and temperature from the pump’s surface and uses it to develop meaningful insight into the pump’s condition and performance. This includes details such as pump speed, vibrations, misalignment, bearing condition and imbalance. Besides, smart sensors attached to the motors connected to the pumps can detect a drop in water flow based on the motor’s output power.
Digitalization also extends to variable speed drives (VSDs). Drive data can be uploaded to the cloud via a remote monitoring solution. This allows data from the drive, motor and pump to be analyzed together, providing insights into the complete powertrain’s health and performance. While water companies are always monitoring their networks for changes in pipe pressures and water flow (that can indicate problems such as blockages and leakages), sometimes the first warning they receive is when a customer notifies them of a burst water pipe. Digitalization can trigger the earliest possible warning.
The earlier or quicker utilities can prevent treated water from being wasted, the higher the savings, not to mention the boost in customer confidence. Non-treated water, also known as wastewater, is a real problem if its leaks into the environment. Utilities can be fined, not to mention the safety hazards for people, property and the image of a water utility.
How hard is digitalization to implement?
The water utility sector has made great strides in the uptake of digital technology. However, there is still plenty of scope for improvement. And because technology has evolved, and the prices of smart devices have decreased, it’s possible to take a great leap forward to achieve a true digital transformation. Ripping out all the existing hardware is probably not the best approach. Utilities need to start with a clear strategic plan to create an entire ecosystem.
This can start by dividing the water network into discrete zones and identifying what is needed to address each specific challenge. Effectively, it is best to start small by adding to existing technology. In this sense, smart sensors are the perfect starting point as they can be placed on a motor, pump, bearings or gearing. They are easy to connect and use without having to invest in new, expensive systems.
Successful application in Singapore
In the bustling city-state of Singapore, its water utility focuses on one main goal: to ensure that the rapidly growing metropolis – with few natural water sources and limited landmass – has a steady supply of clean water. To add to the challenge, water demand is set to double in the next four decades over its current consumption of over 400 million gallons a day.
High operational costs, rising energy usage, and a national workforce shortage compelled Singapore to think beyond convention. ABB and the Public Utilities Board (PUB), the water utility, conducted a successful pilot, which involved installing smart sensors on the PUB’s motors and pumps.
The real-time data obtained via the sensors allowed the utility to reduce troubleshooting time and resources, and paperwork. ABB then installed an integrated solution with 22 smart sensors, remote condition monitoring, and augmented reality glasses (Microsoft HoloLens) to assist with maintenance and training.
It also installed six digital powertrains, which integrate sensor and drive data with cloud-based analytics along the entire chain of plant equipment – from drives and motors to pumps and bearings. The condition monitoring portal allows the PUB to configure the powertrains easily and monitor critical health and operating parameters via a single portal. The digital powertrains, in turn, alert the utility to warning signs of failure, which helps reduce maintenance costs.
Looking ahead
A smart city is often described as a ‘system of systems’, where the Internet of Things (IoT) and analytics converge with traditional infrastructure. These cities use IoT and analytics capabilities to reach operational efficiency and improve service levels, sustainability, and economic vitality. Previously siloed sectors such as power, transport, disaster management, and water all work in sync.
Many cities around the world have made great strides in digitizing several areas of infrastructure, such as energy and transport. Still, most have yet to connect their water supplies to their smart city strategies and systems. However, the threat of growing scarcity may push more cities toward smart water management systems.
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Read the story in the new issue of the Energy portal Magazine CIRCULAR ECONOMY march 2021.-may 2021.
