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  1. Water12

    HDPE Anchor Blocks

    77JQX- This design is for a potable water distribution system. Temperature of the treated water can get as low as 35 degrees during winter months. So I have been basing calculations on a 20 degree temperature difference (considering trench to be around 55 at 5 feet of cover). It sounds like I...
  2. Water12

    HDPE Anchor Blocks

    77JQX - OK, I see what you are saying now. Concerning the thermal effects, did you determine the stress by multiplying the effective modulus by the coefficient of expansion/contraction by the change in temperature? (Standard thermal expansion/contraction equation for restrained conditions)...
  3. Water12

    HDPE Anchor Blocks

    77JQX- I think I understand what you are saying. You were just trying to determine what the movement would be from poisson effects if there was no restraint of the pipe. Did you also consider thermal effects from the pipe being restrained between two anchors? This is mentioned on page 2 of...
  4. Water12

    HDPE Anchor Blocks

    77JQX: Regarding your quote below. When you say you calculated the restrained length for rigid pipe, are you using something like the DIPRA equations for ductile iron pipe? If so, what value are you using for unit frictional resistance? Are you then using the restrained length equation for a...
  5. Water12

    HDPE Anchor Blocks

    Hello bimr, I have reviewed the documents you referenced and I find them a little puzzling, hence me questions. You say that a 1000ft piece of pipe would have more pullout force than a 5ft piece of pipe, however length is not a component of the pullout equation. How then could that be true...
  6. Water12

    HDPE Anchor Blocks

    thread164-290415 I was reviewing the above referenced thread which talks about HDPE anchor blocks to resist poisson pullout effects when transitioning from HDPE to an unrestrained joint pipe system. We are designing approximately 6,000 lf of 18" HDPE water main that will connect at each end...

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