Waterworks
2017
China
Municipal Networks
Securing Water for Millions
The Shuangqiao reservoir is located in the hilly province of Guizhou in southwestern China. Constructed in 2017, it supplies water to the industrial zone and municipal system of Liupanshui city with a population of over 3 million.
The reservoir is part of a comprehensive water management system being implemented in Guizhou province.
lifting the water from Shuangqiao to a top reservoir with an elevation difference of 380m, via a 1200mm steel pipe.
Preventing Water Hammer Damage
The project consists of two pump stations in series. In every pump station, 6 pumps are operating in parallel – lifting the water from Shuangqiao to a top reservoir with an elevation difference of 380m, via a 1200mm steel pipe. Due to the length of the system and the significant elevation differences, water hammer became a significant concern. In order to keep maintenance costs to a minimum, maximize the lifespan of system components, and maintain adequate safety measures, it was necessary to protect the system from the damages of a potentially severe water surge.BERMAD engineers suggested the ideal water hammer solution for the project.
Air and Surge Protection System
BERMAD engineers offered 40 units of BERMAD 8”-C70 Combination Air Valves to be installed on the main line. Valve model C70 is designed to evacuate air during pipeline filling. This enables large volume air intake when the system is drained, preventing the water column separation that can lead to water hammer. It also evacuates air during pipeline filling, so that air pockets may be safely released from pressurized pipes.
In addition, two 10” BERMAD 735 and two 10” BERMAD 835 Surge Anticipating Control Valves were installed on lateral lines. These offline, hydraulically-operated, diaphragm-actuated valves sense line pressure and open when detecting a sudden pressure drop such as that resulting from abrupt pump stoppage. This provides adequate pressure relief to eliminate the destructive surge effect and protect the system in the event of pump failure.
The hydraulic solution was designed by sales engineers and technical staff from BERMAD China. BERMAD engineers were involved at all stages of the project. This included surge analysis services at the project’s start, moving on to sizing the control valves and air valves, all the way through to commissioning and ongoing support.
The Shuangqiao reservoir system was installed in 2017 and has been functioning since then without significant problems or damage due to water surge or water hammer.
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Accurate volume tracking -
High-pressure tolerance
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Low-flow detection
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Maintenance-free design
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Remote data logging
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Long-term reliability
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