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Valve Closure
HAMMER
Air Valves
backflow preventer
Control Valve
Controls
Discharge to Atmosphere
emergency shutdown
Method of Characteristics
negative pressure
Pressure reducing valve
PRV
PSV
Pumps
STREETER
TCV
Throttle Control Valve
Transient
transients
Water and Sewer
water and wastewater
water distribution
Water Distribution network
Water Hammer
Water Modeling
WaterCAD
waterhammer
STREETER BOOK WORKED EXAMPLE AND HAMMER RESULTS-DIFFERENCES IN MAXIMUM TRANSIENT PRESSURE
Hans Diaz
Hello, I found the example 3-1 on the Streeter book "Fluid Transients" (2004) it consist in a pipeline of 600 m length, 0.5 m diameter, Darcy friction factor 0.018, reservoir with 150 m hydraulic grade and a valve that close in 2,3 seconds, following…
9 months ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Behavior of pump in the case of Valve closure is not clear
Ismail
I am modelling a system, and one of the scenarios is an emergency shutdown of the flow control valve (FCV) downstream of the pump as shown in the following image: the FCV is modelled as a throttle control valve (TCV) with the properties of the original…
Answered
over 3 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
MODEL VALVE IN HAMMER
Edgar Lopez
Hi community, I am a new user of HAMMER software, and I need to study what happens in an upstream pipe of 2.5 m of diameter when a valve is closed suddenly, I have tried to find tutorials on youtube and there are a couple, the majority related with pump…
Answered
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
I am New to Water hammer. I want to model water hammer due to valve closure.
Ahmed Ifthikar
I am New to Water hammer. I want to model water hammer due to valve closure. The pressure line of DN600 is a sub header from a DN1200 pressure main of 6bar. As I didn't know how to introduce pressure without a source, I made the model considering a pump;…
over 4 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Modelling of Valve Closure effect
Omid Gol
Hi Guys, I created a model to find best valve closure time in normal operation of a gravity pipeline. I got strange result. Level difference between reservoir and valve is 10m but I got maximum transient pressure of 250m if valve is closed in 2 stage…
Answered
over 6 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Water Distribution Network _ Valve Closure
Tawfiq Malhis
I have a large water distribution network which is mainly a 600mm water pipeline that feeds 10 different areas (districts) as shown in the attached screenshot. I am doing transient analysis to find out an optimized closure times for the flow control…
Screenshot1.jpg
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over 9 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Top Feed Gravity Dischare Tank
Jesse Dringoli
Hi, I would suggest ending the system at the inlet of the tank using a discharge to atmopshere node element, since the tank itself and downstream elements won't be effected by the valve closure. The Discharge to Atmosphere node can be configured as…
over 11 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
problem w/ TCV during transient analysis
Rodman Houser
i defined an operational pattern for a TCV to simulate gradual valve throttling, but the transient model yields unexpected results. The pattern starts at 0% relative closure and gradually (in one second intervals) ramps closed (in 10% increments), so…
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Distribution Sytem Wide Hammer and Transient Analysis of RPZ
bpeskin
I am attempting to set up a model to demonstrate how a RPZ (Reduced Pressure Principle Backflow Preventer) will respond to Hammer. For those unfamiliar with the operation of an RPZ, I have attached a document which outlines this very well. …
RPZ.pdf
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over 14 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 12 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Valve closure (transient) modelling in Hammer
Jesse Dringoli
Hello Sukru, The reason why you see those fields in the Lesson2_WaterGEMS.wtg file is because that file is configured to have user defined initial conditions specified. This is designated by the setting of "true" for the attribute called "Specify…
over 14 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
Re: Air valve size
Jesse Dringoli
Hello Mohsen, Without seeing the model or full animation of the profile path, it's hard for me to tell. Generally speaking, air valves can only provide protection against subatmospheric pressure in the direct vicinity of that air valve. So, if the…
over 12 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: Modelling with TCV
Jesse Dringoli
Sovan, The table you mentioned defines the valve characteristics, not the closure pattern. Be sure to also define the operating rule, which is the pattern of closure over time. You can also find some advice on modeling TCV closure here: …
over 13 years ago
OpenFlows | Water Infrastructure
OpenFlows | Water Infrastructure Forum
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