WaterCAD, WaterGEMS and HAMMER have the ability to model multiple minor losses in a single pipe. This TechNote explains how to do it.
WaterCAD, WaterGEMS and HAMMER won't calculate the losses automatically if you place pipe bends, etc. You must account for these losses by using minor loss coefficients if you would like to. In some modeling cases, it might be necessary to represent multiple minor losses in a particular pipe. For example, if there are multiple bends throughout the pipe, plus a gate valve.
However, many modelers will choose to omit minor loss details (since as the term implies, they should be minor compared to other losses). If you find that minor losses as having a significant impact on pressures, it could be due to large velocities in the pipes. Headloss from minor loss coefficients is equal to K * V^2/2g.
A minor can be used on both a pipe as well as on a valve. They both use the standard minor loss equation where Hl = K*V^2/2g. With the valve, you can use a different diameter to impact the velocity and with a pipe, the velocity is based on the pipe diameter. The other difference is in the layout and visualization. If you want to see the head drop at a node, use a TCV. If you are OK with distributing it over a length of pipe, use the pipe. Using the TCV also has the benefit of being able to see it visually in the drawing and account for it in the separate flextable.
1) You will need to have a spread sheet with 3 columns: a) Label b) Minor Loss Label c) Quantity
This is a sample of what your worksheet might look like Minor Losses worksheet for Modelbuilder
Note: The minor loss label will be the exact label name that you have listed in the minor loss coefficients manager
2) Create a selection set of pipes that you are going to be adding a collection of minor losses for.
3) Open your flextable based on that selection set . Edit the flextable and add the column titled "Specify Minor Loss Coefficient?" then set it to "False", which is a blank checkbox.
4) Open ModelBuilder (Tools > Modelbuilder) and start a new run.
5) In step one choose the appropriate Excel datasource, which will likely be "Excel 2013 / 2010 / 2007 (12.0)" and click the Next button twice
6) On step 3 make sure your options are set up as shown below and click the Next button twice
7) Set the Table Type to "Pipe, Minor Losses" (blue box) and the Key Field to "Label" (red box). In the field mapping steps below (green box) match the Minor Loss field to the "Minor Loss Coefficients (Label)" and the Quantity field to the "Quantity". Click Next when done.
8) When asked in the last Modelbuilder step if you'd like to build a model choose "Yes" your information will be imported. Double check to make sure the information is correct on a few pipes.
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