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  1. jobarr

    Adding Headloss To Piping System?

    Hello all, Is there a reliable and predictable way to add headloss to a pipe system so that I can stay on a pump curve? If there is little to no elevation head, then the TDH relies entirely on headloss in the pipes. In order to generate enough headloss in the pipes to develop a TDH that works...
  2. jobarr

    Flexible Connection to Skid

    Thank you all for your comments. Based on the comments you have provided, and additional research, I am leaning toward installing a single arch Mercer (series 450) expansion joint at the point of connection to the skid. Any thoughts on this approach?
  3. jobarr

    Flexible Connection to Skid

    I am working on a project where we are installing a new domestic water booster pump skid for a small community. There is existing flanged ductile iron piping that we will be connecting to. Should there be a flexible connection between the booster pump skid suction and discharge lines and the...
  4. jobarr

    Booster Pump Sizing based on Peak Hour Demand

    Thank you all for your input. After extensive on-line searching, I came across a few different references that provided some insight, but nothing that was very enlightening. Based on the information I found, typical domestic water peak hour factors range between 3 to 10 times the average daily...
  5. jobarr

    Booster Pump Sizing based on Peak Hour Demand

    77JQX, That is a good point. Irrigation could be a driving force. The project is located near the coast in Northern California (almost Oregon). The climate here is very mild and we get plenty of rain and fog. Many of the homes in this subdivision have landscaped yards, but I would expect...
  6. jobarr

    Booster Pump Sizing based on Peak Hour Demand

    Thank you all for your help. With all of the domestic water booster pump stations in the US, it is surprising to me that there isn't a more common method to dealing with this situation. Bimr, thanks for the reference for the peaking factor. In the link you provided in your post, there is...
  7. jobarr

    Booster Pump Sizing based on Peak Hour Demand

    Question: Is it legitimate to use peak hour demand for the sizing of domestic water booster pumps? I am working on a project where we need to size a booster pump skid to provide domestic water for a subdivision with 224 homes. There is already a separate fire pump which will handle fire...
  8. jobarr

    EPANET Properties Dialogue Box Missing

    Hello, I am working with EPANET and for some reason, the properties dialogue box won't show up on my screen. When I first started working with the model (created by someone else), the properties box would often pop up half-way off the screen, and when I put my cursor over it, it would slide...
  9. jobarr

    Undrained Cohesion

    mudman, thanks for looking into this. It sounds like I need to brush up on my understanding of cavity expansion theory. One thing that I keep getting hung up on is that in the MDrill manual, right above equation 63, it says "In case no data about the undrained strength of the soil is...
  10. jobarr

    Undrained Cohesion

    Thanks for the reference. It looks a bit daunting, but I will try to make some sense of it and correlate it to equation 63.
  11. jobarr

    Undrained Cohesion

    Molerat, thanks for looking at this. Equation 63 has been confusing me for years. I finally decided to try this forum to see if anyone could provide an explaination. Equation 63 closely resembles Mohr-Coulomb shear strength, but it has a few differences that really confuse me. I have not...
  12. jobarr

    Undrained Cohesion

    I have uploaded the portion of the manual that presents the Cu value. The equation for Cu is located on the fourth page of the scanned document.http://files.engineering.com/getfile.aspx?folder=83bef134-8980-4db1-a880-b0f2fd806f69&file=MDrill-Manual.pdf
  13. jobarr

    Undrained Cohesion

    Hello, I am new to this forum, and was hoping to get some help with a soil strength varible that is consfuing me. I am conducting a hydraulic fracture analysis for a HDD project. To do this, I am using the program MDrill (from the Netherlands). In their user manual, they refer to "Undrained...

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