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  1. 21121956

    Hydraulic Turbine Wicket Gates

    Hello everybody: Hi saplanti. Well, I'm sorry I didn't make myself understood. I'll put it this way: I know very well the elements of a reaction turbine. In relation to the Guide Vanes, these are in multiples of 4, that is, 20, 24, etc. My question is if, of those 20 or 24 Guide Vanes, 10 can...
  2. 21121956

    Hydraulic Turbine Wicket Gates

    Hello everybody: Even though I know that it is a rare or strange query, I find myself in the painful situation of asking a simple question: do any of you know about the existence of a reaction hydraulic turbine (Francis or Kaplan), which has Guide Vanes (Wicket Gates) of two different types...
  3. 21121956

    PTFE (Teflon) bearings

    Hello everybody: I am very grateful for the comments from all of you. El que no puede andar, se sienta.
  4. 21121956

    PTFE (Teflon) bearings

    Hello everybody: Ever since the 1970's, the use of PTFE faced pads in large vertical axis hydro-generators was pioneered in Russia and China, prompted by a series of failures of conventional Babbitt-faced bearings. At present, I have heard very little about the application of this material...
  5. 21121956

    Hollow Jet Valve discharge

    Hello everybody: Hi FacEngrPE, as I indicated in my first post, having the maximum level in the reservoir, the valve was fully opened and a flowmeter showed 4,5 m3/s, a value far from the 8 m3/s proclaimed by the Contractor. Thanks for your input. El que no puede andar, se sienta.
  6. 21121956

    Hollow Jet Valve discharge

    Hello everybody: Hi Ione1, as I indicated in my last comment, accepting a velocity of 4 m/s and with the pipe having a diameter of 0,80 m, the typical flow rate that any turbine would handle would be 2 m3/s. With this flow circulating in the 40 m long pipe, having eliminated the hollow jet...
  7. 21121956

    Hollow Jet Valve discharge

    Hello everybody: Thank you LittleInch for your input. Originally, the designer thought that the 8 m3/s could be released through that pipe. In the location where the valve was installed, which is not the appropriate one, the 8 m3/s CANNOT be discharged through the pipe. But some people in my...
  8. 21121956

    Hollow Jet Valve discharge

    Hello everybody: Thanks 1503-44, LittleInch and pierreick for your input. Let me tell you that, for the optimization of resources, we want to explore the idea of installing a small turbine to handle this ecological flow. For this, the hollow jet valve must be removed, leaving the butterfly...
  9. 21121956

    Hollow Jet Valve discharge

    Hello everybody: In the dam of a hydroelectric plant there is a pipe to discharge the ecological flow. See Figure 1. The entrance to that pipe is at an elevation of 270 meters above sea level (masl). The maximum water level in the reservoir is 290 masl and the minimum water level is 280 masl...
  10. 21121956

    Loss of material in penstock.

    Hello everybody: Thank you all for your valuable comments. In relation to your questions, I tell you the following: The water that goes to the turbine is water from a reservoir, fed by a river, it is therefore clean water since the solids that it could drag are deposited at the bottom of the...
  11. 21121956

    Loss of material in penstock.

    Hello everybody: Thanks ironic metallurgist for your comments. The hydroelectric plant has been in operation for 7 years. In the section of penstock next to the spiral case, voids have been detected between the concrete and the pipe. Civil Works Maintenance plans to perform contact injections...
  12. 21121956

    Loss of material in penstock.

    Hello everybody: In a penstock of a hydroelectric power plant, the problem of corrosion of the outer face of the pipe arises, just as it is no longer embedded in the concrete at the entrance of the spiral case. The pipe is UNI 7070-72 S355J EN10025. The diameter of the pipe is 3,250 mm and the...
  13. 21121956

    Pumping over a high point

    Hello everybody: ccc89, I am about to undertake a project very similar to the one that you expose in the Forum. I wonder if you could provide me with the name and email address of the pump seller (vendor) and establish a first technical commercial link with him. Thanks in advance. El que no...
  14. 21121956

    Sliding gates in a bottom outlet

    Hello everybody: Thanks for your input. El que no puede andar, se sienta.
  15. 21121956

    Overload test in a traveling crane

    Hello everybody: Thank you all for your contributions. dik, regarding your question, I can comment on the following: OSHA, Occupational Safety and Health Administration standard at 29 CFR 1910.179 (k) states: (1) Operational tests. (2) Rated load test. Test shall not be more than 125 percent...
  16. 21121956

    Sliding gates in a bottom outlet

    Hello everybody: Sliding gates or bureau have been installed in a dam bottom outlet, with a working head of 70 meters. For reasons of filling the reservoir, in the opinion of the owner of the project it is necessary to have these gates available to discharge, if necessary, and thus regulate the...
  17. 21121956

    Overload test in a traveling crane

    Hello everybody: In a hydroelectric power plant, the overhead traveling crane used for the assembly of turbines, generator and auxiliaries was not commissioned with overload, only was made the test with the nominal capacity. Today, two years later, there is a legal claim for that fact. The...
  18. 21121956

    Welding with different Codes

    Hello everybody: Thank you all for your comments. John is welding the Tainter gate as a result of the Engineers's (Owner's Representative) decision. Given the integration of John in the welding works of that gate, it only remains to await the results of the non-destructive welding tests. So...
  19. 21121956

    Welding with different Codes

    Hello everybody: Here goes my query: John is qualified by ASME Section IX to weld in 6G (enabling him to weld in ALL positions). He is currently welding a penstock in a hydroelectric project. Peter is qualified by AWS D1.1 and is currently welding a radial (Tainter) gate at the same hydro...
  20. 21121956

    Hydraulic symbols

    Hello everybody: That symbol seems more like a Sequence Valve. El que no puede andar, se sienta.

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