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Hammer Validation Test Case 01

Hello:

I've been running the Hammer Validation file Test Case 01 and have experienced some problems. The model keeps saying that the specified pump speed is not in any of the four text quadrants. The full speed already in the model was 1100 RPM and the specified speed in the text file is 1276 RPM. I didn't know if I was supposed to but I ended up changing the full speed to 1300 RPM and changing the specified speed to 1276. This let the model run but the results are off. I've attached the graphs. Please let me know how to fix the initial problem with the pump specific speed and how to get the results to match. 

Thank you!

yusuf

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  • Hello Yusuf,

    Can you provide a screenshot clarifying the issue you're encountering? (the exact wording of the error). 

    Rotational speed and Specific Speed are two different things. Specific speed refers to a number that relates to the shape of the four-quadrant pump characteristic curve and is a dropdown selection in the Transient tab of the pump definition. 

    The test case from this article uses a special custom four quadrant curve which needs to be properly installed per the steps in the article. Otherwise you will get an error about the specific speed in the pump definition not matching any specific speeds in the quadrant curves text file, which I suspect is the issue you're encountering. Make note of the 32-bit vs. 64-bit consideration in the article. Under File > Help > About, if it indicates that you are using the 64-bit version of HAMMER, you will need to ensure that the quadrantcurves.txt file from the test case is copied to the "x64" subfolder within the HAMMER installation folder. You will then need to restart HAMMER, reopen the model, then confirm in the Transient tab of the pump definition that the Specific Speed is selected.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • Thank you for this. I tried copying the file to the x64 folder but it kept saying the file already existed? I decided to rename the text file and then add it in. I reopened the model and still managed to get the same error. There was no specific speed populated. Do you recommend selected one from the drop down (1270 or 1280)? 

  • Yes I did confirm that we are using the 64-bit of the program and I did reopen the program again. I've attached the picture of the files in the folder. The quadrantcurves file was already in the folder so it wanted me to overwrite the existing one. I wasn't sure if that was ok so I just renamed the new file to quadrantcurves1. Do you recommend I overwrite the existing file and try again?

  • Thanks for clarifying. I thought you had meant that you renamed the old file. The required Specific Speeds are in the new quadrantcurves.txt which needs to be present with the original name in that folder in order for HAMMER to recognize it. I would suggest replacing the existing file with the new file. If you have custom specific speeds entered in the existing quadrantcurves.txt file I would suggest first renaming it (the original quadrantcurves.txt) so that the new one (from the test case) can remain in that folder with the file name quadrantcurves.txt


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • I completed the transfer and replaced the existing file. The program ran without any errors. The pressure results matched the word file but the flow result was off. What could be causing it?

  • Hi Yusuf, your results are being graphed at the downstream end of only one of the two pumps. In the test case, the flow was observed at the point downstream of both pumps so it shows the flow from both pumps together. In the Time History tab of the Transient Results Viewer, graph flow at the endpoint P-5:J4 which is the upstream end of the first pipe after the junction of both pumps. I tested this and the flow matches the test case.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

    Answer Verified By: Sushma Choure 

  • Perfect! Just did it and it works! Thank you for your help! 

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