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  1. cr1973

    corrossion resistant buried fasteners

    I'm looking at options for fasteners used for mechanical joint connections in water main construction projects. The typical "cor-blue" bolts are hardly corrosion resistant, aside from the manufacturer's claims. We are looking at 304 or 316 stainless steel, but I'm wondering if there are any...
  2. cr1973

    Water service insulation when crossing over large storm sewer

    Thanks all for the comments. I think I'll encapsulate the service with insulation, that might be the safest bet.
  3. cr1973

    Water service insulation when crossing over large storm sewer

    I'm working on a project where I need to run a bunch of 1" copper services over the top of an existing 48" storm sewer. Crossing over the top will allow for about 5 ft of cover over the new water services. I plan to insulate over the top of each 1" service whenever the cover is less than 6 ft...
  4. cr1973

    Air Relief Valves on Water Distribution Lines in Subdivision

    CivilG - as cvg mentioned, try to hit your high points where ever hydrants will be installed. Also, you should be aware that c-900 allows for very little, or no, joint deflection at push joints. Put any grade breaks at mechanical, not push, joints. I can't tell you how many designers screw...
  5. cr1973

    Stainless question from a non-materials engineer

    Thanks again
  6. cr1973

    Stainless question from a non-materials engineer

    These rods are typically tied to a bronze valve plate via a stainless steel pin, and I'll try to find out if their 17-4 allow is in the h1150 condition. We've seen these things fail as early as 12 years, usually in the 15 or 20 year range though. Expected life should be about 80+ years.
  7. cr1973

    Stainless question from a non-materials engineer

    Thanks for the replies guys. We have had several stems rotted away to the point where it looked like a beaver went at, chewed up like an apple core, near the bottom of the stem which I assume was the water line of any stagnant water sitting in the bottom. These stems were made of plain steel...
  8. cr1973

    Stainless question from a non-materials engineer

    Any thoughts as to corrosion resistance of 17-4 stainless versus 304 SS? This would be for a hydrant rod/stem. The rod might sit in stagnant municipal water at times, and fluctuate between a wet and dry conditions, typically dry though. Temps would be cool, from about freezing to maybe 60 or...
  9. cr1973

    Options to remedy low MC backfill

    oldestguy: The trench is located within the road right of way which is to be paved in asphalt. The testing tech took a proctor from the stockpile for comparison, so we believe the material in the field matches closely to the proctor. Some of the results were in the mid 80%s as well.
  10. cr1973

    Water line size

    Wait right there - you are running a half mile of water line from the existing water main to the new building? 1 inch is laughable, you won't even get a trickle through that due to the friction losses. It'd recommend at least 3" in diameter, and even larger if he needs fire protection. Run the...
  11. cr1973

    Options to remedy low MC backfill

    Our contractor completed a small pipeline project, backfilling the trench with a predominantly sand material which also included some stone as well. Upon having several compaction tests taken, the material was seen to fall in the 90 to 95 percent range, failing our required 95% modified min...
  12. cr1973

    Lot grading, water percolation & french drain on the property line along the fence..How2 drain t

    As someone said before, you guys are WAY overthinking this. This seems to be a clear surface water drainage issue. The patio might be pitched properly, but the clay impervious layer beneath may still be backpitched, allowing water to flow through the limestone screenings down to the clay, and...
  13. cr1973

    Digging a well to lower the water table affecting your basement -would this work?

    Minime: Think of it this way: The limestone will not help at all with grading since it is porous. The clay layer BENEATH the limestone is what determines which way the water flows. If that clay layer slopes towards your house, water will flow towards your house. Even if the limestone grades...
  14. cr1973

    Wet Well Volume

    I don't know much about force mains, but a 24" sewer dropping 1400 gpm of flow sounds like an awful lot for a 4' diameter wet well.
  15. cr1973

    Detecting source of water damage - from water main?

    There are a variety of leak detection methods you could use to check the water main, and water service, for leaks. A leak of this magnitude would be pretty easy to locate.
  16. cr1973

    Pavement Bearing Capacity

    3" of asphalt does not sound like a good paving solution in this case.
  17. cr1973

    Contract delay

    I for one do not believe the contractor should be reimbursed for those 7 days. Perhaps for the first day, when the spring was found and nobody knew what to do. But the contractor should have just focused on a different project in the mean time. To sit there and wait, and expect to be paid for...
  18. cr1973

    simple HGL calculation

    HGL as I take it is simply the difference between the two elevations, as well the difference between the two pressure heads (converted to feet if elevation is in feet). Suppose pressure tank is at elevation 100 ft, at 100 psi. That grade point is 331 feet. Assume pressure at storage tank is...
  19. cr1973

    Water Main Relining

    Thanks all for the posts.
  20. cr1973

    Water Main Relining

    I am considering lining some old cast iron pipes, in lieu of dig and replace. The process appears to involve cutting open the existing main, pull a liner through, then inflating this liner with water or steam. Once the liner cures, a robot runs inside the pipe and cuts holes at the service...

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