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Recent content by aatara

  1. aatara

    Cv vs Position in a Gate Valve

    Thanks friends, I appreciate your helps. I found the Figure "flow resistance vs open" in the Handbook of Hydraulic resistance by Idelchik and I´ve estimated the CV vs %open. I know that a partially open gate valve is not a good practice, but temporary I have to use it as a throttling valve.
  2. aatara

    Cv vs Position in a Gate Valve

    Hello to everybody Do you know a Table or Figure where could I calculate the Cv of a standard gate valve vs open or degrees of opening? My valve is a 10" 150 -lb wedge-shaped Carbon Steel and I don´t have documentation of the valve (20 years old) Regards,
  3. aatara

    Improve an Air Cooler with spraying water

    Thanks quark and dcasto quark, I have this comments about your answers: 1. Could you indicate me what past threads are more useful for this topic? I didn´t find its. 3 & 5. The Air cooler was not prepared to wetted surface and then to suffer corrosion. Is there any recomendation to avoid this...
  4. aatara

    Improve an Air Cooler with spraying water

    Hello to everybody. I am studying the viability of spray water before an induced air cooler to reduce DBT air entering. My doubts are next ones: 1. Do you know experiences positives with this solution? 2. How could I estimate the real reduction of the DBT spraying a quantity of fine drops...
  5. aatara

    Centifugal pump with water and air

    Thanks to everybody, The event that I´m considering is a guillotine break in a large pipe near the suction. The suction pressure in normal operation is 30 psig aprox. After the break the pressure of the system fall dramatically and the pressure in the suction goes below atmospheric pressure...
  6. aatara

    Centifugal pump with water and air

    Hello to everyone I have a closed cooling system with a horizontal pump (KSB 14000 gpm - 200 ft) and several heat exchangers. The normal operations condition are 120 psig and 100 ºF. I´d like study special situation where a failure in a pipe could allow air enters into the circuit. How does...
  7. aatara

    Special valve for cavitation[/]

    Thanks to everybody. At the end, I decided to install 2 meters of Stainless Steel pipes after the last orifice to reduce the impact of the cavitation. Finally, I will test the wall thikness every year, with UT to study this problem in the future.
  8. aatara

    Orifice plate sizing

    I agree with TD2K. The result is a 0.7 inch hole in the center of the plate. However you must chek that the plate is cavitation free. With 125 psi delta P and 55 psi downstream pressure the cavitation coefficient is less than the plate cavitation index, so you will have cavitation and noise in...
  9. aatara

    SS 316L with Carbon steel A106 GrB

    Thank Metalguy. My system has an operational factor of 90%. The circulating water is pumping from a natural lake, only filter we have. The temperature is 100 ºF, aprox.
  10. aatara

    SS 316L with Carbon steel A106 GrB

    Hello, Could anyone explain me the corrosion problem in an array of pipes made of A106 GrB, where I connect terminal fitting (spray nozzle) and pipes of SS 316L? How could I protect the terminal pieces of SS from corrosion (galvanic piles, pitting, etc)? Thanks in advance
  11. aatara

    Inside diameter below of tolerance

    Thank TD2K for your interest. The main problem is welding these elbows out of tolerance with pipe that respect the ANSI tolerance, then I have to repair the elbows (increasing the ID) or prepare the border of the pipe and the elbows in order to weld them in a good way. In the last case, the...
  12. aatara

    Inside diameter below of tolerance

    Thank you for your answers. At first I need theses fittings urgently (sorry, they are elbows and not bends from a pipe) and I don´t have any time to wait for news elbows. I have to repairs this fitting and I need to know some requirements from the code to accept them.
  13. aatara

    Inside diameter under tolerances

    Hello, Anyone could help me to find in what part of the code ASME explains the rules or requirements to increase the inside diameter of a 90º bend? I have several 90º bends 30" SA234WPCW Sch XS. After a dimensional test, the inside diameter in some parts of the ends is below of the ANSI...
  14. aatara

    Inside diameter below of tolerance

    Hello, Anyone could help me to find in what part of the code ASME explains the rules or requirements to increase the inside diameter of a 90º bend? I have several 90º bends 30" SA234WPCW Sch XS. After a dimensional test, the inside diameter in some parts of the ends is below of the ANSI...
  15. aatara

    DVD external player for mobile PC

    Hello to everyone: I have a PIII mobile PC with a CD/RW, but I need play movies un DVD. How can get that in a not very expensive way?. I only know one DVD external player of FREECON (port USB), but it´s very expensive for me (more than 160 $) Thanks.
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