The challenging structure of Prestressed Concrete Cylinder Pipe (PCCP)
A Prestressed Concrete Cylinder Pipe (PCCP) comprises multiple layers of materials. The primary material is concrete, followed by a steel cylinder. The next layer consists of prestressed steel wires that create a stable compressive force.
The complex structure and multi-material composition of PCCP pose significant challenges for non-invasive ultrasonic flow metering, especially when measuring large-diameter pipes. Low-frequency, high-amplitude transducers are required to measure the flow rate in large-diameter PCCP accurately.
Flexim FLUXUS WD is the most reliable and accurate clamp-on ultrasonic flowmeter available, capable of measuring extremely low flow rates down to 0.01 m/s. Other measurement technologies and devices can experience significantly higher error rates at low flow conditions, making them unsuitable for monitoring minimal nighttime flows.
While monitoring nighttime minimum flows is essential for leak detection in water distribution networks, the Flexim FLUXUS WD stands out as the best choice due to its exceptional accuracy and reliability at low flow rates
- No need to shut down, cut pipes, or drain the system: Installation is quick and does not disrupt operations.
- All excavation and roadwork can be completed in one day, saving both time and labor.
- Significant cost and time savings can be achieved, accelerating project timelines.
- No calibration is required, and there is no zero drift, ensuring accurate and stable measurement results.
- Accurately measure extremely low flow rates down to 0,01 m/s (approximately 0,03 ft/s).
The Flexim FLUXUS® WD features two transducers securely mounted to the pipe using stainless steel straps and housed in robust stainless steel casings. The transducers themselves have a standard IP68 waterproof rating. In a unique feature, the transducers are connected with permanent coupling pads, eliminating the need for gel that can degrade or wash away. This ensures the system's durability, making it suitable for buried installations.
The Flexim FLUXUS® WD can transmit and receive signals through multiple layers of materials commonly found in pipes, such as PCCP, ensuring sufficient signal quality for accurate flow measurement. Ultrasonic signals are transmitted at a rate of 1000 times per second and evaluated by a highly sophisticated digital signal processor, which calculates time differences based on cross-correlation. This ensures excellent noise reduction and results in highly accurate data, even on challenging pipes.
The Flexim FLUXUS® WD has three different transducer types and can accommodate pipe diameters ranging from 50 to 6500 mm. Its powerful output signal and noise reduction technology suit all pipe materials, even challenging ones like fiberglass reinforced plastic (FRP).
The Flexim FLUXUS® WD is a state-of-the-art clamp-on ultrasonic flowmeter designed for challenging underwater or buried installations. Its installation is quick and easy, requiring minimal excavation and no pipeline or water supply interruption, resulting in significant cost and time savings.
There's no method to calibrate the zero-point drift of our devices simply because there is no drift. The WD Series is designed to be installed without zero-point calibration and remains drift-free permanently. FLEXIM is the only company to achieve this, thanks to the unique combination of paired, factory-calibrated "twin" transducers.
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