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Case studies  >  Project - Water Distribution, London  >  Use of Dorot 30-6-PR (HyMod) solution  >    

Use of Dorot 30-6-PR (HyMod) solution

Project objective
To reintroduce appropriate pressure management to this water supply zone.

The challenge
The existing flow meter and old PRV (figure 1) were surveyed for possible service and re-use. The valve was seized, again puttingit beyond economic repair.

The solution
1.   Replace seized GA PRV with new 150mm (6”) diaphragm type PRV.
2. Pressure logging has identified a possible 20-25 m reduction in pressure with some form of modulation at night.
3. A 150mm Dorot PRV was purchased mated to a Fluid Controls hydraulic modulator with high pressure limitation pilot rail (figure 2).
As demonstrated in the charts below and in the next page: The volumetric reduction is 0.23 Mld (million litres per day).
Figure 1
Figure 2
Graph 1
- Pressure and Flow results illustrating postcommissioning of PRV and modulator.

Graph 2 - Flow results illustrating thedrop in night flow (pressure reductionduring low demand hours) andimprovement in supply during highdemand hours (achieved as a resultof the low PRV losses).


Graph 3 - Daily Flow resultsillustrating volumetric saving.

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