Tips and Tricks
Eland Afuang Client Service Manager
Water Network and Operational Systems Modelling User Group
5th August 2014 SA Water Learning Centre, Adelaide SA
Pressure Reducing Valves
Fixed outlet
Fixed ratio
Pressure Modulated
Electronic (Remote Controlled)
Hydraulic (Flow Modulated)
Pressure Modulated PRV
Electronic (Remote Controlled) using solenoid
Maintain pressure at CP (Critical Point)
Pressure Modulated PRV
Hydraulic (with local flow modulation)
via an orifice plate / venturi tube
Flow Modulated Valve (FMV)
Model Instabilities in PRVs
In some cases, there is a sudden
increase/decrease of demand due to the
demand profile
May need to review and ‘smooth’ the
demand profile if possible
Model Instabilities in PRVs
Manifold (parallel PRVs)
e.g. Night & day time valve
May need to add UPC (Rule based controls in
InfoWater / H2OMap) to represent switching
Combine two PRVs into one and use control grid
Valves in InfoWorks WS are physical objects
which respond to hydraulics
Variable Speed Pumps
Can be modelled via UPC
PST operates on ZERO FLOW – Head too high
Demand is low and min speed too high
Check pump nominal speed (oftentimes used as min speed)
Decrease min speed
Variable Speed Pumps
Applies to Standard and Fire Flow runs only
Rule based controls cannot be used
Pump can’t deliver head (run message)
When updating with latest version
Make sure to set a min speed
Transients / Surge
Transients Advisor
Estimating potential hydraulic transients based
on velocity change (Joukowski's law)
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