Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

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

Search results for query: *

  1. greggy

    Difference between Jack and Boring and Microtunneling

    Jack-and-bore is used for horizontal pipe installations (beneath highways, rivers, etc.) where a push and a receiving pit are excavated. Contractor installs what looks like a small locomotive on rails with a rotating head to auger and push a casing pipe through the ground to the receiving pit...
  2. greggy

    Estimating Main Breaks

    I've used our pipe model with an outlet about the size of the break hole set up as a reservoir to check the order of magnitude of a break's flow. The hole size is adjusted for restrictions such as soil or broken pipe. I've compared the model break flow rate with the actual tank drain rate and...
  3. greggy

    Seeking information about Utility Service Group

    We have used this company to clean and inspect our distribution water storage tanks. They have provided us fast turnaround service and full reports. No shortcuts, no complaints. Our utility is located in northeast Ohio.
  4. greggy

    Waterline freezing protection

    We've used successfuly a powdered insulation material called Gilsulate (it's on the web). It's suitable for underground installation and has compressive strength. It slows down the rate of cold penetration. Their competitor Dri-Therm makes a similar product.
  5. greggy

    High point in a water transmission line

    Whenever you have a main break, mass quantities of air are sometimes sucked into the main, travel down the main, and reside at these highpoints. Instead of an automatic air release, valve, and piping in an expensive vault, consider just tapping the main with a 1-inch copper line and bring it...
  6. greggy

    Pump Station/Water Tank/Fire Flow Demand

    Don't forget to tell the local fire chief when you will have the tank down for maintenance since it may impact his available flows.
  7. greggy

    Check Valve Causing Water Hammer

    We have had very good success with a resilient flapper check valve on pump discharge settings such as the 2100 Series by AFC. Very quiet on pump shutdowns.
  8. greggy

    Small diameter water supply main next to a gas station

    We have successully used a LMW (low molecular weight) hydrocarbon non-permeable pipe wrapper called PetroGard made by MPC Containment Systems on a 36-inch ductile iron diameter water main through 300 feet of BTEX-contaminated area. Find them on the net. We had to get EPA approval to use the...
  9. greggy

    Determining Restraint Length for a 24-inch Ductile-Iron Water Main Encased in Concrete

    Just a suggestion: encase the pipe in concrete, but leave the pipe joints exposed for future inspection for leaks and future maintenance or disassembly. If possible, instead pour thrust blocks on the backside of the bends, with the block surface area bearing on undisturbed earth. Calculate...
  10. greggy

    Pipe flow characteristics

    Agree with 77JQX in that water system operators must mind keeping at least 20 psi in ALL portions of the distribution system during a fire or other emergency, particularly if the service area is hilly where pressures in elevated areas drop when someone in the valley opens a hydrant and thinks...
  11. greggy

    Pipe flow characteristics

    The flow test results you mention are perfectly understandable for an older tuberculated water system that maintains a high static pressure at the hydrant nozzle with no or very low flows, then poops out when the flow is increased due to the extreme head losses through the pipe from the source...
  12. greggy

    Wooden plugs?

    Here in Ohio we have kept wooden plugs on hand for emergencies for many years. We keep an old broom handle in each truck and whittle the end down to a taper to drive into corporation holes and pin hole leaks that have eroded into larger leaks. After driving the broom handle into the main we...
  13. greggy

    Water Main Relining

    We have had much success with old-fashioned cement mortar lining of mains in streets too difficult to dig up the entire length, like brick or utility-laden. I think we can go about 300 to 500 feet per lining run, with locations usually where the valves are, which we most of the time repalce...
  14. greggy

    Why both restraints and thrust blocks?

    I suspect the pipe pressures in refineries are far less than the maximum we have operating a water distribution system (our maximum is 180 psi in the valley). In the perfect world without corrosion and backhoes there will be no thrust blocks. In the meanwhile, we stick with installing them.
  15. greggy

    Why both restraints and thrust blocks?

    I agree with pappaus....belts and suspenders is the way to go to sleep well at night and minimize the liability even though the cost is higher. Here in my water system we have had instances where the pipe thrust restraint failed due to corrosion or others hitting our main, and we have had...
  16. greggy

    Inter-zone Bleed for Water Quality

    In our system we have the same situation: we bleed from the high to the low service to keep water moving in "pocket" areas. We make a connection between the two mains with 1 inch copper tubing with a curb stop valve for on-off control. The small diameter tubing runs continually a manageable...
  17. greggy

    Combination Air Vac Valve (CAV) Relocation

    In situations like this we tap the top of the main at the highpoint with a 1 inch corporation, then run a copper line to the location we wish and install a curb stop and copper riser in a valve box or meter box. This allows us to manually bleed the air off the main for operations and filling.
  18. greggy

    Typical Hydrant Installations

    EngWade....the anchor pipe is just like an MJ pipe joint, only there is a metal ring welded onto the spigot end that is restrained by the follower gland and T-head bolts. The anchor pipe lengths are in 6 inch increments. There are anchor fittings also (tees and 90 degree bends).
  19. greggy

    Typical Hydrant Installations

    We use to use bell collars and threaded bar stock to restrain hydrant runs, but we now use anchor pipe and fittings in the event in the future the street is widened, then extending the restrained hydrant run is a much simpler matter without having to shut down the whole main plus offering...
  20. greggy

    Double arrangement/48-inch butterfly valves

    I am familiar with type of valve arrangement to provide "either way" feed to critical customers (e.g., hospitals) during water main emergencies. It allows the customer to draw their water supply from either direction when one side of the main is out of service for a repair. An alternate that...

Part and Inventory Search

Back
Top