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Describe what a system head curve is and run a basic system head curve simulation.
Type:
Tutorial
Length:
5 min.
Tutorial resources
These downloadable resources will be used to complete this tutorial:
Transcript
00:04
System head curves are designed to help InfoWorks WS Pro users
00:08
in evaluating both existing and proposed pump stations,
00:11
based on the hydraulics and nature of the water distribution system the pump is operating in.
00:17
The system head curve simulation can assist in the configuration of a new pump
00:23
that will be part of a system expansion, or it can replace an existing pump.
00:28
It is important to note that these simulations do not determine where pumps should be placed within the distribution network;
00:35
rather, they assist in the generation of system head curves.
00:39
The System Head Curve Analysis within WS Pro describes the relationship between the system head
00:45
and the flow capacity for a pump at different time ranges.
00:49
Results from this analysis can help you with the selection of suitable pump types in your final network design,
00:55
and they can assist with the planning of the capacity of pumps.
00:59
A System Head Curve is a Pump Station Analysis,
01:02
which is an analysis of the entire pump station and not of an individual pump.
01:07
Most systems will have a family of system curves.
01:11
The curve will depend on boundary conditions such as tank levels, demands,
01:16
and what other facilities are operating.
01:19
Pumps run where the pump curve and the system curves intersect.
01:23
It is important to note that as the system changes,
01:27
the pump will still only operate in between the intersection points of the minimum and maximum system curves.
01:33
In determining a system head curve, a series of steady state runs are carried out in WS Pro
01:40
with the flow through a pump station varying between zero and the maximum flow.
01:45
The difference in head across the pump station at the different flow rates determines the pump curve.
01:51
WS pro determines the upper and lower bounds of the system head curve by determining the maximum static lift
01:57
with the highest headloss and the minimum static lift with the lowest headloss, respectively.
02:03
Begin a simple system head curve analysis by creating a System Head Curve simulation.
02:08
From the SHC Model Group, right-click Run Group and select New > Run from the flyout.
02:15
The Schedule Hydraulic Run dialog opens.
02:19
Type a name for the run in the Title field.
02:22
For this exercise, call this run “SHC”, and then enable Experimental.
02:28
Then, from the Model Group, drag and drop the SHC network into the Network panel in the Schedule Hydraulic Run dialog.
02:35
The Control and Demand Diagram group boxes populate as well.
02:40
In the Run Type group box, expand the drop-down and select System Head Curve.
02:45
The System Head Curve Options dialog opens.
02:49
Here, drag and drop the Pumps selection list into the Selection List panel.
02:54
Then, enable Calculate at maximum demand , set the Number of curve points to 10, and in the Calculation Times group box,
03:02
set the calculation time to May 2nd 2022 at 10:00.
03:09
Click OK.
03:11
Click Save, and then Run.
03:14
When the simulation is complete, right-click on the SHC Control simulation,
03:20
select Open As..., and choose System Head Curve Report.
03:25
The report opens initially in a grid, listing the pumps used in the analysis and a summary of various parameters.
03:33
Right-click the pump station KCH2PMPFR.KCH2PMPTO.1 and select System Head Curve.
03:46
The PST Operation window opens.
03:50
Here, you can find the pump curves for the selected pumps,
03:54
as well as various operating parameters.
03:57
This output can be used to more accurately size existing or proposed pumps in the analyzed network.
04:04
The system head curve analysis can be used for individual pumps as well as multiple pumps set in parallel or in a series.
04:13
A set of curves will be produced for each pump in the analysis.
04:18
If a pump station with multiple pumps is being analyzed,
04:22
then the simulation will produce one set of curves derived from the full combined capacity of the pump station.
Video transcript
00:04
System head curves are designed to help InfoWorks WS Pro users
00:08
in evaluating both existing and proposed pump stations,
00:11
based on the hydraulics and nature of the water distribution system the pump is operating in.
00:17
The system head curve simulation can assist in the configuration of a new pump
00:23
that will be part of a system expansion, or it can replace an existing pump.
00:28
It is important to note that these simulations do not determine where pumps should be placed within the distribution network;
00:35
rather, they assist in the generation of system head curves.
00:39
The System Head Curve Analysis within WS Pro describes the relationship between the system head
00:45
and the flow capacity for a pump at different time ranges.
00:49
Results from this analysis can help you with the selection of suitable pump types in your final network design,
00:55
and they can assist with the planning of the capacity of pumps.
00:59
A System Head Curve is a Pump Station Analysis,
01:02
which is an analysis of the entire pump station and not of an individual pump.
01:07
Most systems will have a family of system curves.
01:11
The curve will depend on boundary conditions such as tank levels, demands,
01:16
and what other facilities are operating.
01:19
Pumps run where the pump curve and the system curves intersect.
01:23
It is important to note that as the system changes,
01:27
the pump will still only operate in between the intersection points of the minimum and maximum system curves.
01:33
In determining a system head curve, a series of steady state runs are carried out in WS Pro
01:40
with the flow through a pump station varying between zero and the maximum flow.
01:45
The difference in head across the pump station at the different flow rates determines the pump curve.
01:51
WS pro determines the upper and lower bounds of the system head curve by determining the maximum static lift
01:57
with the highest headloss and the minimum static lift with the lowest headloss, respectively.
02:03
Begin a simple system head curve analysis by creating a System Head Curve simulation.
02:08
From the SHC Model Group, right-click Run Group and select New > Run from the flyout.
02:15
The Schedule Hydraulic Run dialog opens.
02:19
Type a name for the run in the Title field.
02:22
For this exercise, call this run “SHC”, and then enable Experimental.
02:28
Then, from the Model Group, drag and drop the SHC network into the Network panel in the Schedule Hydraulic Run dialog.
02:35
The Control and Demand Diagram group boxes populate as well.
02:40
In the Run Type group box, expand the drop-down and select System Head Curve.
02:45
The System Head Curve Options dialog opens.
02:49
Here, drag and drop the Pumps selection list into the Selection List panel.
02:54
Then, enable Calculate at maximum demand , set the Number of curve points to 10, and in the Calculation Times group box,
03:02
set the calculation time to May 2nd 2022 at 10:00.
03:09
Click OK.
03:11
Click Save, and then Run.
03:14
When the simulation is complete, right-click on the SHC Control simulation,
03:20
select Open As..., and choose System Head Curve Report.
03:25
The report opens initially in a grid, listing the pumps used in the analysis and a summary of various parameters.
03:33
Right-click the pump station KCH2PMPFR.KCH2PMPTO.1 and select System Head Curve.
03:46
The PST Operation window opens.
03:50
Here, you can find the pump curves for the selected pumps,
03:54
as well as various operating parameters.
03:57
This output can be used to more accurately size existing or proposed pumps in the analyzed network.
04:04
The system head curve analysis can be used for individual pumps as well as multiple pumps set in parallel or in a series.
04:13
A set of curves will be produced for each pump in the analysis.
04:18
If a pump station with multiple pumps is being analyzed,
04:22
then the simulation will produce one set of curves derived from the full combined capacity of the pump station.
System head curves are designed to help InfoWorks WS Pro users in evaluating both existing and proposed pump stations, based on the hydraulics and nature of the water distribution system the pump is operating in. The system head curve simulation can assist in the configuration of a new pump that will be part of a system expansion, or it can replace an existing pump.
IMPORTANT: These simulations do not determine where pumps should be placed within the distribution network; rather, they assist in the generation of system head curves.
The System Head Curve Analysis within WS Pro describes the relationship between the system head and the flow capacity for a pump at different time ranges. Results from this analysis can help you with the selection of suitable pump types in your final network design, and they can assist with the planning of the capacity of pumps.
A system head curve is a pump station analysis, which is an analysis of the entire pump station and not of an individual pump.
Most systems will have a family of system curves. The curve will depend on boundary conditions, such as tank levels, demands, and what other facilities are operating. Pumps run where the pump curve and the system curves intersect.
IMPORTANT: As the system changes, the pump will still only operate in between the intersection points of the minimum and maximum system curves.
In determining a system head curve, a series of steady state runs are carried out in WS Pro, with the flow through a pump station varying between zero and the maximum flow. The difference in head across the pump station at the different flow rates determines the pump curve. WS Pro determines the upper and lower bounds of the system head curve by determining the maximum static lift with the highest headloss, and the minimum static lift with the lowest headloss, respectively.
To begin a simple system head curve analysis, create a System Head Curve simulation:
To access the System Head Curve Report:
The report opens initially in a grid, listing the pumps used in the analysis and a summary of various parameters.
To access pump curves for selected pumps and their operating parameters:
This output can be used to more accurately size existing or proposed pumps in the analyzed network.
The system head curve analysis can be used for individual pumps as well as multiple pumps set in parallel or in a series. A set of curves is produced for each pump in the analysis.
If a pump station with multiple pumps is being analyzed, then the simulation produces one set of curves derived from the full combined capaci
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