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  • Users: coloeng
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  1. coloeng

    Contract Specification Infrared Tube Heaters

    We are working on the contract documents for a small warehouse and plan on using infrared tube heaters. Just wondering if anyone has a good specification that they would be willing to share. Thanks
  2. coloeng

    Handling Potential Groundwater on Project as Owner's Risk

    We have a pipeline that will be constructed that has an area that has potential groundwater that is primarily driven by irrigation in the area. It is difficult to determine how much groundwater there will be at any given time or point. We will be bidding the project in the next month and one of...
  3. coloeng

    Bermad Hydrometer Control Valve

    We have a 2" Bermad Model 910 Hydrometer control valve that is not calibrated correctly. I have been having a problem getting any technical help from the local representative and was wondering if anyone has any experience with these valves or knows anyone that does. Thanks.
  4. coloeng

    Pitless Booster Pump Station

    Has anyone had any experience with a pitless booster pump station that uses a submersible turbine pump in a buried chamber. Baker Monitor has one as an example, see attachment. If you have experience I would like to know some pros and cons. We are looking at about a 3 - 5 HP pump. Thanks for...
  5. coloeng

    AWWA C605?

    I kknow that AWWA Standard C605 was replaced in 2014 by C605-13, does anyone have a copy of the previous standard and if so can you tell me what the section regarding hydrostatic pressure testing of the main required? Thanks in advance.
  6. coloeng

    Casing Spacers for HDPE Carrier Pipe in HDPE Casing

    We have a project where we will need to provide a casing for a 12-inch water line that crosses under an irrigation canal. Because the canal is on the sideslope of a hill, the casing will have to have a curvature in it. The casing only needs to have the same strength as the carrier pipe, which...
  7. coloeng

    Question on Concrete Sand Filter

    I remember a few months ago there was a discussion about using concrete sand for a filter around a french drain. I believe there was some reference to a Corps of Engineers paper that was published discussing concrete sand as a filter material. I have tried searching for this discussion, but...
  8. coloeng

    New C900 Pressure Classification

    Recently AWWA changed the pressure classification of C900 PVC pipe from 100 psi(DR-25), 150 psi(DR-18)& 200 psi(DR-14) to 165 psi, 235 psi & 305 psi. They have reduced the factor of safety form 2.5 to 2.0 and eliminated the built-in surge allowance. I would just like some of your thoughts on this.
  9. coloeng

    Pressure Testing Water Main with Super Chlorinated Water

    Anyone know of any drawbacks to pressure testing a new C900 PVC main while the super chlorinated water is in the line?
  10. coloeng

    Specification for Pond Liner

    I am looking for a good CSI format specification for Hypalon or Reinforced Polypropolene to be used as a liner for a sedimentation pond for one of our pump stations. Any help is greatly appreciated.

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