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Hidroinformatica Hidraulica aplicada - Applied Hydraulic
Link de apps de ingeniería hidráulica para iphones y celulares android PDF Print E-mail

Ya tenemos nuestro espacio de aplicativos ios y android en itunes y google play, que pueden visitar en los siguientes links

Apps de ingeniería hidráulica para iphones y tabletas ipad

Aplicaciones android de ingeniería civil y sanitaria

Las apps no son gratis, pero consideramos que el precio de menos de 2 dolares para una app técnica que exige muchas horas de programación, y que sobre todo les puede ser útil para cálculos en terrenos a  los ingenieros civiles, es un precio justo y además constituye un incentivo para continuar el desarrollo de otras apps, así que si usted desea apoyar nuestro trabajo de antemanos le agradecemos.

 
Calculation and selection of valve for water hammer PDF Print E-mail

Normally when we have a pump, you must perform a review of the behavior of the overpressure caused by the sudden shutdown of the pumping system, known as water hammer.

One of the appropriate softwares for these purposes is water hammer (Bentley). To observe the behavior of the pressure along the pipe because of water hammer, a hydraulic model is developed with the computer program "HAMMER", where you can simulate the dynamic behavior of the pressures along the pipeline with different types of valves and fittings.

The analysis is more critical in case the pumps off for lack of current and instant closing of the valves.

To do this we take the example of a pump to a tank that is made with three parallel pumps. The curve of the pumps and the system is shown below.


When we calculate for water hammer conditions, we see that if no devices are installed to mitigate the impact, the consequences can be damage to the pipe. The following chart shows the maximum transient pressure is reached (red), compared to operating pressure (blue). We see that the transient pressure exceeds operating in more than 250 meters of water column.


If we put on a graph piezometric lines (Hydraulic Grade Line) with respect to ground, red shows the piezometric generated by the hammer.



The same system provided with pressure relief valve

Valve is simple in its operation and open when a pressure exceeding the maximum allowable.

We place a valve 6 "water hammer suppressor, by relieving pressure at the outlet of the pumping station and measure it to open at a maximum pressure of 250 meters. In this case we obtain the following HGL, very similar to the pressure line, and ensures that the pressure does not exceed that value.



As we see by applying a simple device like this, we can reduce the risk of the water hammer and damage to the pipe. It may be the case that a simple relief valve is not sufficient and should be combined with anticipatory water hammer valve or even a hydropneumatic tank. That's why you should always modeling with the proposed device to check its effect.

In the next article, write a little more about the selection criteria of this type of valve.

 
Data required for modeling hydraulic pipe networks PDF Print E-mail

We have to make a hydraulic model of a city piping system in EPANET or any other software.  What data do I need to collect? Follow the necessary data.

For the preparation of the model.

- Shapes files with the topology of the network, including diameters of all the pipes, locations of operational valves and water metering sector boundaries, locations of pressure reducing valves, their diameters and settings.
- Digital Elevation or Terrain Model (DEM) or digital mapping or topography with elevations, so that elevations can be assigned to nodes. This information can be found in GIS information as vector files of the type DXF or SHP.
- Data from the pumping stations or booster pumps. The data required are the working number of pumps and their characteristic curves.
- Data on water levels in sources (reservoirs), treatment plants, pumping stations, tanks. Data of volumes of tanks.
- Database or table of average consumption of geolocated users, which may be a shape file with points of each user and a reference table of these users and their average reading of water volume consumed.
- Reading of income flow to water metering areas or any study that would enable an estimation of demand curves in time.

For calibration of the model.
- Hourly measurements of pressure, flow, water levels at selected points of at least one week.
- Flow test performed.
- Timely operation of network elements such as starts and stops pumping schedules, operation of valves, etc.
- Any studies of leakages or state of the network.

 
Steps to draw a topographic profile in AutoCAD Civil 3D PDF Print E-mail

Having a surface in civil 3d, it is easy to draw a profile from it. For that we just have to draw a polyline through where we want the profile, turn it into alignment (In option Aligments -> Create from Polyline aligment) and then create the profile from the surface.

Using these steps will create a profile from data of abscissa and heights of land we have in an excel sheet. With these data we have to build the surface. First will create three columns in Excel X, Y and Z. The X column that we have, we make a constant Y = 10 for example, and the Z representing the heights. Now we have a group and points with a constant
Y. If now we increase the Y in 10, we get three groups of points for Y = 10, 20, 30. Then we convert the spreadsheet to CSV and import it from the Civil 3D using the menu option "Import Points".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To import the points we should consider choosing the option ENZ (comma delimited) and mark "Add items to a Group of Points" defining a name for the group.

We then create a new surface and the Surface option -> Definition -> Point Groups, right-click "Add" and choose the group of points that we had created earlier. We already have the surface.

The next step is to draw a polyline from one side to another and convert it into alignment. Once this is done we can build the profile from the polyline.

If you like to continue receiving technical articles like this, you can subscribe using the email box you'll find over to the left of our website.

 
How to Make a longitudinal section of land in Civil 3d? PDF Print E-mail

Given a table of two columns in excel with the abscissa and the heights, we save it as a space-delimited text file (prn), change the extension to txt and then from the AutoCAD Civil 3D go to the "Create profile from file" and import the file with the points.

Another way to create the txt file is saved as csv or comma delimited text. Then we opened in the notepad editor and replace the commas for space and change the extension to txt.


 
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