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  1. nackra

    jersey barrier with integrated chain link fence

    I did a project with debris barriers and learned that there was a modified version for race tracks: https://www.geobrugg.com/product_en,,136754.html
  2. nackra

    Resolution/Lessons to Sodium Hypochlorite Injection Skid Gassing Up and Losing Prime

    what type of pumps are used? * diaphragm * peristaltic
  3. nackra

    Design of Thermoplastic and FRP Tanks

    we have used tanks from this manufacturer for a variety of chemicals including hypochlorite, alum, bisulfite: https://www.polyprocessing.com/
  4. nackra

    Pervious Driveway Infiltration Rate

    Pervious pavement will require maintenance to remain "pervious" About 15-years ago city installed an "innovative" infiltration drain system for a storm drain (aka, storm sewers in the Midwest) under a street. I learned about the installation after working for the city a couple of years. Street...
  5. nackra

    Corrosive atmosphere from leaking hypochlorite tank?

    chemical supplier should provide SDS for hypochlorite https://olinchloralkali.com/wp-content/uploads/2019/06/Sodium-Hypochlorite-5-17_US_EN.pdf hypochlorite will definitely corrode metals. The hypochlorite concentration/strength will affect the amount of corrosion.
  6. nackra

    Number of hours to design excavation project

    any groundwater to account for?
  7. nackra

    Stream Channel Stabilization

    Reference that might be useful: https://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=17816.wba
  8. nackra

    Septic waste disposal repair small area

    Mound system may work. The footprint may be too large to fit in a "small yard" https://www.nesc.wvu.edu/wastewater/onsite-wastewater-systems
  9. nackra

    Tank Wall Hydrostatic Pressure

    buoyancy reference: https://precast.org/wp-content/uploads/2022/08/NPCA-Buoyancy-White-Paper-2022.pdf Concrete canoes float
  10. nackra

    DogHouse Manhole - Deflection Angle

    Other reference guides for your consideration: https://precast.org/wp-content/uploads/2021/10/Manhole-Sizing-Recommendations-2021.pdf https://precast.org/2012/12/anatomy-of-a-doghouse-manhole/?fs=doghouse
  11. nackra

    Pipeline deflection and Expansion Joint

    I have used this fitting on projects: https://ebaa.com/products/spotlight/FLEX-TEND_Installation/index.php 1503-44 hits critical points
  12. nackra

    Effects of exceeding maximum concrete temperature

    reduction in strength and durability problems down the road. https://www.forconstructionpros.com/concrete/equipment-products/article/11486068/twining-inc-hot-weather-effects-on-concrete
  13. nackra

    Large Vertical Cracks in Basement Wall

    When was the farmhouse originally built? Maybe stone foundation was replaced with concrete in "sections" - butting up against stone... Just a thought. I agree - not shrinkage cracks!
  14. nackra

    Epoxy lined sewer manholes

    NASSCO has some references that will help your assessment https://live-nassco.pantheonsite.io/resources/ LittleWheels has offered good guidance
  15. nackra

    An unusual feature (to me) on a steel truss bridge

    maybe when they modified when they widened the 101 and off-ramp
  16. nackra

    Squished beam support

    What are conditions at the other end of the beam? Did a bearing wall get "removed"? I have seen remnants on residential "improvement" projects
  17. nackra

    Steel Pipe to Concrete Manhole Connection

    not sure how large your pipe is, and I presume gravity pipe: http://www.a-lok.com/ https://www.gptindustries.com/en/products/steel-wall-sleeves https://usa.sika.com/content/dam/dms/us01/n/Hydrotite%20Pipe%20Penetration%20Installation%20Guide.pdf
  18. nackra

    Pipe In Pipe

    I would suspect that there are fittings in 9,000-LF of 8-inch pipe. Pulling a 3-inch PE pipe (IPS: 3.5-inch OD) might be difficult while meeting allowable bending radius. https://www.jmeagle.com/sites/default/files/jme_PEWaterandSewer.pdf
  19. nackra

    Steel Casing Thickness

    check source for casing pipe: http://www.steel-pipe.com/ansi_pipe_chart.htm I agree with bimr and fel3, use standard material (not custom)
  20. nackra

    Airport Runway Loading

    references that Navy might have more current issues: https://www.publications.usace.army.mil/Portals/76/Publications/EngineerManuals/EM_1110-3-142.pdf?ver=T7WPD1eSXb0UkLQXm8m2JA%3d%3d...

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