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Recent content by ubique345

  1. ubique345

    HDPE Under Full Vacuum - Constrained Pipe Resistance to Collapse

    I'm not too sure what you mean here, but what I meant was: DR13 Pipe Cost = DR21 Pipe Cost * 2.5
  2. ubique345

    HDPE Under Full Vacuum - Constrained Pipe Resistance to Collapse

    I didn't notice this before, but literally laughed out loud as this is essentially what I'm saying in my post. But don't we all to some degree balance our reputation with design cost? FYI: ~2.5x the cost. LI & BI, Thank you both for your posts, you have been very helpful. Yes, I was going to...
  3. ubique345

    HDPE Under Full Vacuum - Constrained Pipe Resistance to Collapse

    Littleinch, I'm familiar with the table you are referring to, or at least I have one that is similar, but it is based on unconstrained conditions I believe. I didnt mention this earlier, but the system will be in -7 PSI gauge always as its a syphon at the lowest pressure zone, but I have...
  4. ubique345

    HDPE Under Full Vacuum - Constrained Pipe Resistance to Collapse

    Mike, Yes, I know its counter intuitive regarding the soil pressure. In regards to over designing: Yes, I agree with you and this is how I would typically do it... Never been congratulated after working hard to save money...but i'd really like to try for this one. Its likely just not worth it...
  5. ubique345

    HDPE Under Full Vacuum - Constrained Pipe Resistance to Collapse

    BigInch, Thanks a lot for your reply. Yes, I did assume initial ovalality at install in the calculation. We were planning to used crushed rock for the primary / secondary backfill ( Haunch and crown), and would cover with geotextile should ground water be present to prevent any soil...
  6. ubique345

    HDPE Under Full Vacuum - Constrained Pipe Resistance to Collapse

    Hello, I hope someone with experience can clear something up for me. I'm trying to size required DR for a water pipeline under full vacuum. The pipeline will be buried 3m, and I intend to achieve a soil reaction - E' = 2000-3000 psi through material type and high compaction. Now, when...
  7. ubique345

    Water Usage Stastics - Reuse Design

    Hello Everyone, I'm looking for a design resource to gauge the amount of water each person will use for: showering & toilet / day. The facility is an addiction treatment centre. We would like to reuse the shower water for toilet water, so for such a facility i'm looking at design value for...
  8. ubique345

    Excel Database for PCA - Rectangular Concrete Tank Design

    Yes, this is the book I already own... but I want the excel format! specifically, the data tables in excel. Ive tried to convert my pdf to excel but it gets messy / data lost in the process.
  9. ubique345

    Excel Database for PCA - Rectangular Concrete Tank Design

    Hello Everyone, I've heard of this elusive creature but have not been able to locate it on the internet and was hoping someone could help me out. I'm looking for an excel database containing all the design coefficients from the most recent Rectangular Concrete Tanks, By: PCA (Portland Cement...
  10. ubique345

    Sizing Pump & Developing system Curve for Negative static head

    Thank you littleinch, your information was a great help.
  11. ubique345

    Sizing Pump & Developing system Curve for Negative static head

    Hello, I'm currently helping with the design of a pumping system where there overall static head is negative, and i've never dealt with a problem like this before. I was hoping you guys could point out considerations for this type of problem, and also help explain how a system curve would be...

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