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transients
HAMMER
Air Valves
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hydropneumatic tank
inertia
pressure
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pump
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Surge Anticipator Valve
surge tank
Surge Valve
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Transient
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Valve Closure
water distribution
Water Hammer
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WaterGEMS V8i
Hammer results File doesn't contain any transient extended node.
aqeel ahmad
Hi, I am new to Bentley Hammer. I am analyzing a Gravity pipeline where water will run from 1619 m elevation to 1400 m elevation in a hilly area with ups and downs. When I check " Transient Results Viewer" it gives a dialogue box. "The hammer results…
over 1 year ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
inserimento air valve dopo evento transitorio arresto pompa (ho bisogno di aiuto)
Giovanni Stabile
buongiorno, dopo tante domande siamo quasi arrivati alla fine del problema. Dopo aver calcolato un'analisi transitoria di arresto di una pompa con numero di giri variabile ho problemi relativi alla cavitazione e quindi ho inserito dove ho questi problemi…
over 1 year ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
evento transitorio spegnimento pompa velocità variabile
Giovanni Stabile
buonasera, ho riscontrato due errori in questa simulazione: 1) problema cavitazione 2) analizzando i risultati dell'analisi ho notato che le portate (flow) delle tubazioni a valle della pompa spenta non tendono mai a 0 ho pensato: per risolvere…
over 1 year ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
modeling a pump start-up transient event in hammer (need help)
Giovanni Stabile
I have an in-line pumping system and I wanted to simulate the pump start-up , I set the problem as in the various examples present in the comunity, but the result of the analysis is "wave speed must be greater than zero". What could be the problem?…
over 1 year ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Determining the occurrence time for max and min transient pressure at all nodes
akash-subudhi akash-subudhi
I have carried out transient simulation for an irrigation network. Based on client requirement, I want the occurrence time of the maximum and minimum transient pressures at all junctions. How can we extract this information that at what instant/time we…
over 3 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Como superar o mejorar las presiones negativas en las " presión extrema cabezales"(extreme pressure and heads)
Jesús Bayona Perez
Hola, tengo presiones negativas en las "presión extrema cabezales"(extreme pressure and heads),el sistema es un modelamiento transitorio en HAMMER(adjunto archivo) Ademas me sale este mensaje 44845 "Con tanque unidireccional" "Pipe" "209" "LINEA…
over 3 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Transient pressure graph in an interior node of the pipe
Hiwa
Hi, How can I draw a transient pressure graph (pressure data against time) in an interior node of a pipe? Thanks
Answered
over 3 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Error: Initial flow is zero, which would result in a discharge coefficient equal to 0, which is not allowed
Gustavo Montero
Good Afternoon: I am trying to model an irrigation net with a pump, reservoir an irrigation net where all are connected. My particular situation to model is: No demand in any hydrant Pump working from the river to the reservoir Pump shot down…
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
area change modeling
mohamed tablia
Hello, how could I model area change in bentley hammer ? Is there any method rather than splitting pipe? does pipe splitting do better simulation for Wave Reflection and Transmission at an expansion and a contraction?
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Gas volume in hydro-pneumatic tank
Velibor Kosanovic
Hello forum, I'm having doubt (due to client "inquiries"), therefore I'm addressing this question to you all. I'm using sealed, gas-law model, hydropneumatic tank element, to model the surge vessel. Total volume is 200m3 and initial gas volume is…
Answered
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Getting reliable results from Bentley Hammer
Hiwa
Hi, I am modelling a simple system to compare the results to some codes that I have. But, despite having all the configurations similar to codes, I cannot get similar pressure fluctuation. Could you please have a look and let me know the reason? …
Answered
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
General Transient Modeling Help
bwhite
Does anyone have a good resource for learning and understanding real world transient problems and models? I'm fairly new to transient analyses but I have been through the Bentley training course. I have a couple transient models that I am currently working…
over 10 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: transient_hammer analysis inquiry
Jesse Dringoli
Hello Ahmed, I would suggest trying both situations (one valve or two), then compare the results by closely examining graphs and profiles in the Transient Results Viewer (animating a profile path is a great start). This should show you if this arrangement…
over 11 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Split UP
Jesse Dringoli
Hello Sachin, I assume that you're referring to Bentley HAMMER V8 XM or V8i. 1) There are many factors that contribute to the transient results that you see in HAMMER. Basically the configuration of all elements in your model can effect…
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Hammer calc error
Jesse Dringoli
Velibor, You need to enter the pump inertia. This is needed for a shutdown event, so HAMMER can correctly compute how the pump spins down. It is not needed with a constant speed pump because the pump isn't changing speed. Regards, …
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Hammer: Pelton free-surface tailrace surge
Matt Baird
Hi I am currently modelling a number of pelton hydro station layouts. One option may (to be confirmed) include a tailrace tunnel with a free surface. Because the tail race tunnel is so long, surges upon start-up are a concern as could flood the pelton…
over 10 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Hammer analysis- hydrotank and surge anticipator valve
Jesse Dringoli
Hello, The minor loss coefficient for a hydropneumatic tank is the same standard minor loss coefficient (K) that you can enter for pipes (to represent bends, valves, etc). The head loss through the tank inlet orifice equals K*V 2 /2g , (the standard…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Regarding SAV
Jesse Dringoli
Samir, It looks like you're referring to Bentley HAMMER. I believe you should be able to get the discharge coefficient from the valve manufacturer. If it's not available, you may be able to approximate it by back calculating the Cv from the orifice…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
HAMMER Transient Analysis and Design training course
Jesse Dringoli
Hello subscribers, We will be offering a Live training course on Transient Analysis and Design with Bentley HAMMER on November 26-29, 2012. This 16 hour course is being taught in 4 hour increments over the 4 days, from 11:00 a.m. to 3:00 p.m. EDT each…
over 10 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Modeling a 1.5 second valve closure at Airplane Fueling Nozzle?
Jesse Dringoli
Hello, The pumps are going to operate based on the system conditions (where the pump curve intersects the system head curve.) So, you'll need to "model what you've got" to get the right pump operating point. Meaning, if there aren't FCVs in reality…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Modeling Backflow in TCV and FCV
Jesse Dringoli
I assume you're using Bentley HAMMER. When you use a TCV or FCV, a discharge coefficient is calculated based on the head loss through the valve in the initial conditions. This discharge coefficient can be seen in the results section of the valve…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Hammer Reservoir Wave Attentuation
Jesse Dringoli
Hello Ryan, When the valve closes, the flow is basically zero. However, the presence of a reservoir (which has a constant hydraulic grade during the transient simulation) may cause small flows in the pipe after the valve is closed. These small…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: orifice in surge tanks
Jesse Dringoli
Hello Inbarasan, I'm a bit unclear on some of what you said, but I'll try my best to address your questions: "...which is the effective shape in orifice?" The surge tank orifice is assumed to be circular, as you must enter a diameter. If the…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Hammer Analysis in Raw Water Transmission System
bwhite
I'm trying to evaluate the need for surge protection at new well locations in a raw water transmission system. I have a network of 6 wells all pumping to the water treatment plant. I'm new to Water Hammer and surge analysis so I'm just looking for some…
over 10 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Hammer - Modelling vertical pipes
Matt Baird
I am modelling a hydro scheme which features a vertical shaft directly at the intake. So lets says the intake is J1 at elevation 100m and drops to J2 at 50m by a 50 m length of pipe before completing a 90 degree bend to horizontal. Whe using the profile…
over 10 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
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