Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations pierreick on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by bimr

  1. bimr

    Minimum horizontal distance between water/domestic lateral lines for townhouse project in California

    The minimum distance between water service line (wet trench) and the 2' wide trench (dry trench) (telephone, catv and elec) may vary from a minimum of 12-inches to 5'. You will have to get the answer from your local building official. https://www.karuk.us/images/JointUtilityTrench.pdf
  2. bimr

    Piping for N2

    What is the application and temperature? Have you looked here: https://www.eng-tips.com/threads/nitrogen-piping.27735/
  3. bimr

    Minimum horizontal distance between water/domestic lateral lines for townhouse project in California

    Post No.3 3 also states: "This is referring to the distance between sewer and other utility pipes, I am trying to figure the spacing between 1" water service lines or if they can be placed next to each other or stacked."
  4. bimr

    Minimum horizontal distance between water/domestic lateral lines for townhouse project in California

    There are specific requirements almost everyone for this. If the inspector finds improper installation, the Contractor will have to correct it. In California, the minimum horizontal distance between a water line (domestic lateral) and a sewer line running parallel to it is typically 10 feet...
  5. bimr

    Feedback about NK and NKG grundfos pumps in Sea Water Desalination

    The NKG pumps are just ordinary transfer pumps. If you procure these pumps with the correct materials of construction, then you shouldn't have any issues.
  6. bimr

    ***LOW PRESSURE SEWER INFORMATION DESPARATELY NEEDED***

    Suggest you review one of the grinder pump systems before you respond. The poster is describing a grinder pump system, not an overhead sewer. These grinder pump systems consist of a 1.5" lateral from the residence that is connected to a 2-3" diameter manifold that conveys the sewage away. The...
  7. bimr

    ***LOW PRESSURE SEWER INFORMATION DESPARATELY NEEDED***

    Not sure what you have going on as you haven't presented the equipment details. Most of these systems have a grinder pump with 85 psi discharge pressure. You should have a check valve adjacent to the grinder pump that prevents the backflow. If you have a leak in the lateral, it would appear...
  8. bimr

    Sewer Pump Station underperforming at Start Up

    I thought the pumps were in parallel. I will look at it again.
  9. bimr

    Sewer Pump Station underperforming at Start Up

    If you look at the horsepower calculator on this site: https://www.engineeringtoolbox.com/pumps-power-d_505.html If you are using a standard no-clog centrifugal pump on this application, you pump motor is likely undersized as the pump efficiency may be as low as 40%.
  10. bimr

    Salt Dosage vs. Capacity relationship

    Ed says: “When you regen the resin reaches an equilibrium with the brine.” That is an incorrect statement and will confuse the poster more than he already is. When salt is applied, the high stoichiometric salt ratio drives the reversible chemical reaction one way, and then the chemical reaction...
  11. bimr

    Salt Dosage vs. Capacity relationship

    The water softener cycle (gallons throughput) is based on a calculation using the following parameters: 1. applied salt dosage in lbs/ cubic feet or g/L 2. resin volume in softener 3. raw water hardness If any of these parameters change, it will be reflected in the gallons throughput. The...
  12. bimr

    Sewer Pump Station underperforming at Start Up

    Another uphill force main with problems! Your operating pumping rate of 190 gpm doesn't have high enough velocity to push the air out. The trapped air results in a higher than anticipated head loss. Not sure how you plan to operate. If the pump is operated intermittently, you need a velocity...
  13. bimr

    Salt Dosage vs. Capacity relationship

    The resin bed has a defined total bed capacity (capacity in grains) calculated by multiplying the total cubic feet of resin times the resin operating capacity. The resin operating capacity is from the manufacturer's chart 4.4.1 Co-current Design Figure 2., resin operating capacity. You can use...
  14. bimr

    sealing old septic tanks

    You will probably find that the piping systems have more I/I than the septic tanks. Recommend the entire system be replaced starting from the residential drain pipe.

Part and Inventory Search