• Modeling Reference - Surge Valves

    Scott Kampa
    Scott Kampa
    Product(s): HAMMER Version(s): CONNECT Edition, V8i Area: Modeling Original Author: Jesse Dringoli, Bentley Technical Support Group Overview This TechNote explains how the surge valve element works and its typical application…
    • 12 days ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Wiki
  • Modeling Reference - Air Valves

    Jesse Dringoli
    Jesse Dringoli
    Applies To Product(s): HAMMER Version(s): V8i, CONNECT Edition Area: Modeling Original Author: Jesse Dringoli, Bentley Technical Support Group Overview This TechNote explains how the Air Valve…
    • 2 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Wiki
  • HAMMER General FAQs

    Sushma Choure
    Sushma Choure
    This is a list of articles containing general FAQs for Bentley WaterGEMS and WaterCAD products. To search within this page, press [Ctrl]+F. Calculations Estimating pump specific speed Transient Force Calculations Input & Modeling What…
    • over 3 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Wiki
  • Air valve modeling example file

    Jesse Dringoli
    Jesse Dringoli
    The model illustrates the use of the air valve element. Several scenarios depict various configurations. This file is for demonstration purposes only. Note: This model can be opened in HAMMER version 08.11.00.30 and above.
    • Air_Valve_Example.zip
    • over 14 years ago
    • Bentley Files
    • TSGWaterWasteWater
  • Surge valve example model

    Jesse Dringoli
    Jesse Dringoli
    This example model illustrates the use of the surge valve element. It includes multiple scenarios, depicting various configurations.
    • Surge_Valve_Example.zip
    • over 14 years ago
    • Bentley Files
    • TSGWaterWasteWater
  • Valve Closure example

    Jesse Dringoli
    Jesse Dringoli
    This example model illustrates different ways to model valve closure with a TCV. Advanced TCV closure modeling is not included. Note: This model can be opened in HAMMER version 08.11.00.30 and above.
    • TCV_Closure_Example.zip
    • over 14 years ago
    • Bentley Files
    • TSGWaterWasteWater
  • Modeling Reference - Hydropneumatic Tanks

    Jesse Dringoli
    Jesse Dringoli
    Product(s): HAMMER Version(s): CONNECT Edition, V8i Area: Modeling Overview This TechNote explains how the Hydropneumatic Tank element works and its typical application in HAMMER. For information on modeling h ydropneumatic…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Wiki
  • Hammer: Pelton free-surface tailrace surge

    Matt Baird
    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
  • Water Hammer Pump Data

    bwhite
    bwhite
    How does Hammer determine the pump speed during a power failure event? It's unclear without the input of the a power curve or torque curve how that data is derived. Are these values interpreted some way from the specific speed? Also, what is the source…
    • over 10 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Re: Hammer analysis- hydrotank and surge anticipator valve

    Jesse Dringoli
    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: Hammer calc error

    Jesse Dringoli
    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
  • Re: Regarding SAV

    Jesse Dringoli
    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
    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: Split UP

    Jesse Dringoli
    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: Modeling a 1.5 second valve closure at Airplane Fueling Nozzle?

    Jesse Dringoli
    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
    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
  • Hammer - Setting gravity

    Matt Baird
    Matt Baird
    Hi I am modelling a scheme which has a gravity lower than the standard 9.81 due to elevation. Is there somewhere in Hammer to set this, as surely the available energy will change?
    • over 10 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Re: transient_hammer analysis inquiry

    Jesse Dringoli
    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
  • General Transient Modeling Help

    bwhite
    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: Hammer Reservoir Wave Attentuation

    Jesse Dringoli
    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
    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
    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: Surge Tank Initial Level

    Matt Baird
    Matt Baird
    When modelling a surge tank it is necessary to dictate the initial level. When the steady state conditions are calculated, this seems to not affect the surge tank initial level, even if it does not match the head at the point on the line where it is installed…
    • over 10 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Hammer: Turbine Curve in Relation to Quadrant Curve

    Matt Baird
    Matt Baird
    Hi I wish to clarify how the Turbine Curve should be sourced for inputting into Hammer in relation to which quadrant curve is being used. I understand the Quadrant curve is defined by the selection of the specific speed. In my case, I am picking a…
    • over 10 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Hammer - Turbine Specific Speed Operating Point

    Matt Baird
    Matt Baird
    Hi When calculating the turbine specific speed to use in Hammer, is it more accurate to use the values for P, H, Q & n at the turbine best efficient point or rated point? The specific speed for these two operating points will differ. Kind regards
    • over 10 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
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