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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
Overview
Pressure Reducing Valves
Variable Speed Pumps
Transients / Surge
Overview
Pressure Reducing Valves
Variable Speed Pumps
Transients / Surge
Pressure Reducing Valves
Fixed outlet
Fixed ratio
Pressure Modulated
Electronic (Remote Controlled)
Hydraulic (Flow Modulated)
Fixed Outlet PRV
With pilot valve that allows a fixed outlet
pressure downstream
Fixed Ratio PRV
Reduced pressure by a set amount
Value between 0 to 1
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
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
Overview
Pressure Reducing Valves
Variable Speed Pumps
Transients / Surge
Variable Speed Pumps
Pump Curve
Variable Speed Pumps
Pump Station Properties > Pump Data tab
Variable Speed Pumps
AUTO or PROFILE mode
Pump Station Properties > Pump Control Data tab
Variable Speed Pumps
PS property sheet > Pump Data > PST Operation
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
Implicit Variable Speed Pump Control
Affinity Laws
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
Overview
Pressure Reducing Valves
Variable Speed Pumps
Transients / Surge
Transients / Surge
Transients Advisor
Estimating potential hydraulic transients based
on velocity change (Joukowski's law)
Maximum Transient Pressure
Transients / Surge
Transients / Surge
Transients / Surge
Detailed analysis
Transients / Surge
Detailed analysis
WANT MORE TIPS?
Want more tips?
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