Surge study for sewage transmission line
Hello
i would like to study a surge effect in sewage transmission line consist from lefting station of 1 submarsible pump .. water will be pumped by the submarsble pump for 1.5 km to a manhole . how can i model that submarsable pump in water hammer…
Changing transient solver accuracy and max trials
Product(s):
HAMMER
Version(s):
10.XX.XX.XX, 08.11.02.31 and greater
Area:
Calculation
Problem
How can you change the Accuracy and Maximum Trials for the transient calculation engine?
Transient results appear to be unstable…
Estimating a pump curve for a model
Applies To
Product(s):
WaterGEMS, WaterCAD, SewerCAD, SewerGEMS, CivilStorm
Version(s):
08.11.XX.XX
Area:
Layout and Data Input
Problem
How do I develop a pump curve if the only known information is…
Modeling multiple pipes downstream of a pump
Applies To
Product(s):
WaterGEMS, SewerGEMS, CivilStorm, SewerCAD, HAMMER, WaterCAD
Version(s):
08.11.XX.XX, 10.XX.XX.XX
Area:
Layout and Data Input
Original Author:
Mark Pachlhofer, Bentley Technical…
Using patterns to control pumps or reservoir HGL over time
Product(s):
WaterGEMS, WaterCAD, HAMMER
Version(s):
V8i, CONNECT Edition
Area:
Layout and Data Input
Problem
How can I use patterns to change the pump speed over time (or turn it on/off based on time), or reservoir hydraulic…
outflow of pumps or reservoirs in model is unequal from reality
Hi
I have encountered some times this problem. I have a flow in the existence pipe of a reservoir or pump in model. I know the demand consumes in the network and use that in junctions. I have measured the outflow with a portable flowmeter or a fixed…
Fire flow nodes are failing because of low pressures on the suction side of a pump
Applies To
Product(s):
WaterGEMS, WaterCAD
Version(s):
CONNECT Edition, V8i
Original Author:
Mark Pachlhofer, Bentley Technical Support Group
Problem
Fire flow nodes are failing the zone or system pressure…
User notification: "Element not included because it is Closed"
Applies To
Product(s):
HAMMER
Version(s):
10.00.xx.xx, 08.11.xx.xx
Area:
Modeling
Original Author:
Scott Kampa, Bentley Technical Support Group
Problem
After computing the transient analysis, a user notification…
Why is the “lag pump count” field not available when selecting Fixed Flow as the “VSPB Type”?
Product(s):
WaterGEMS, WaterCAD, HAMMER
Version(s):
08.11.XX.XX and 10.00.XX.XX
Area:
Layout and Data Input
Problem
Why is the “lag pump count” field not available when selecting Target Flow as the “VSPB Type”?
How can the…
Why do I need to enter a "nominal head" and "nominal flow" when modeling a pump startup event?
Product(s):
HAMMER
Version(s):
08.11.XX.XX and 10.00.XX.XX
Area:
Layout and Data Input
Problem
Why do I need to enter a "nominal head" and "nominal flow" when modeling a pump startup event?
Solution
When modeling a pump…
"Reverse initial flow through pump or turbine. Change the flows in the pipes leading to this pump or turbine."
Applies To
Product(s):
HAMMER
Version(s):
CONNECT Edition, V8i
Area:
Analysis/Computation
Original Author:
Jesse Dringoli, Bentley Technical Support Group
Problem
How do I solve the following…
Error when computing: Reference to a deleted or inactive downstream pipe
Applies To
Product(s):
WaterGEMS, WaterCAD, SewerGEMS, SewerCAD, HAMMER
Version(s):
CONNECT Edition, V8i
Area:
Modeling
Original Author:
Scott Kampa, Bentley Technical Support Group
Problem
After computing a…
Modeling pump startup against a closed valve in HAMMER
We are trying to model a pump startup scenario in HAMMER (v 8.11.03.17) with the pump starting 10 seconds into the simulation and the discharge valve starting to open up 15 seconds into the simulation. We followed the Tech Note for startup scenario but…
Re: Surge analysis results utilization
You can experiment with the effects of inertia in the model by changing each pump's inertia value (go to Components > Pump Definitions > Transient). However remember that the inertia (pump and motor combined) is dependent on the actual pump and motor…
Hammer Negative Pressure - Instability at Steady State
Hello,
I am using Hammer V8i.
I have a simple layout for a pump station transient model. A pump draws from a wet well, and discharges over a syphon into an effluent conduit. The discharge syphon creates a negative pressure at steady state. My transient…
How to model pump trip and restart?
In Hammer V8i is there any way to model a pump trip/stop followed by a start?
thanks.
Discharge to Atmosphere Elements - Rating Curve
I have a query about how Hammer deals with the Rating Curve option. In the Hammer Help file, the following information is all that is provided:
Rating Curve - releases water from the system to atmosphere based on a customizable rating curve relating…
Re: Hammer V8 XM
Hi Shannon,
Hopefully you have also sent these questions to the Tech Support Group, as they can typically provide a faster response than you might get over the forums...however, if you are still needing help:
- The Pump element in HAMMER…
Re: Hammer
Using a flywheel to increase pump intertia is certainly a solution that has been used by others to try and minimize the effects of transients.
As for whether or not it is a good solution in this case, I think that is something you would need to…