Yorkshire Water Case Study

Challenge

Yorkshire Water (YW) manages 31,000km of clean water network in the UK providing 1.24 billion litres of  potable water each day.  

A principal regulatory challenge is the reduction of  leakage within the network. Inflowmatix was  approached to help with this challenge – in  areas prone to bursts and leaks.  

One of these district metered areas (DMA’s)  was Fox Street. Fox Street is a pressure man aged area of Sheffield controlled through a PRV. The area is largely residential, with some  light industrial users.  

As this area had a moderate burst and leak  rate, YW deployed a number of high frequency (HF) InflowSense™ ‘Edge’ devices to get a  better understanding of the underlying issues within the DMA. 

Solution

Over a number of days our Cumulative Pressure Induced Stress (CPIS™) metric, showed a significant increase in dynamic activity indicating a prelude to a burst.   

In parallel with this, the existing YW alerting system of night line usage indicated there was a probable burst due to increase in demand.  The burst was fixed and back ground pressure returned to normal. However an unsteady state was still indicated by the underlying CPIS™ metric.  

Collaboratively a further step of source localisation was undertaken which highlighted  secondary issues with the PRV. Further investigation  observed the PRV to be hammering and hunting for  optimal pressure.  

Adjustments to the PRV were completed and checked  against a standard 1-min interval pressure logger.  

Results

Post field adjustments, further inspection using 128s/s summary data, raw data downloads and CPIS™ metric  confirmed the PRV behaviour remained unstable with  a 5 metre pressure variation over 0.2 second period  being observed. This concluded the PRV was oversized and needed replacement.

Without the detailed insight from the Inflowmatix high  frequency InflowSense™ ‘Edge’ devices, CPIS™ and  InflowSys™ platform the root cause of the problem  would have been undiscovered and the instability  within the network would have remained.

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