Bentley Communities
Site
Search
User
Site
Search
User
Welcome
Products
Support
About
More
Cancel
Browse By Tags
All tags
transients
Air Valves
Discharge to Atmosphere
Example model
FCV
HAMMER
pressure
PRV
Pumps
reviewed2017
Reviewed2021
Surge relief valve
surge tank
Surge Valve
TCV
Transient
Transient Analysis
Turbine
v8i
Valve Closure
water
Water Hammer
Water Modeling
WaterCAD
WaterGEMS
WaterGEMS V8i
Modeling Reference - Surge Valves
Jesse Dringoli
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…
5 months ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Wiki
Modeling Reference - Air Valves
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…
1 month ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Wiki
HAMMER General FAQs
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
Surge valve example model
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
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
Air valve modeling example file
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
Modeling Reference - Hydropneumatic Tanks
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
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: 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: 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
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: 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
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
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
Water Hammer Pump Data
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 9 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: 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
Control valve response to transient event
LWillnow
Is there a way to model the response of a control valve to a transient event beyond manually inputting the transient operational pattern? An example would be what happens to a PSV when the transient pressure drops below the pressure set point.
over 11 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: How should i enter data for air valves?
Jesse Dringoli
Hello Cesar, I assume you're referring to Bentley HAMMER V8i. When using an air valve, you must be careful to size it such that air pocket collapse doesn't cause worse pressures than without the valve at all. Animate your profile path in…
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Hammer - Turbine Specific Speed Operating Point
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
Hammer: Turbine Curve in Relation to Quadrant Curve
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: Surge Tank Initial Level
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 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
Re: Modeling tanks inlets
Jesse Dringoli
Hello, For a steady state or EPS simulation, a top-feed tank is typically modeled by using a PSV on the upstream side. By setting the PSV to the top elevation, the HGL will be forced up to that elevation instead of the tank initial elevation.…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
<
>