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  1. insult2injury

    How to know if a PSV has opened?

    The failure to open could also have been due to pressure buildup above the disc. I2I
  2. insult2injury

    Large Pump Mnufacturer

    rmw: ITT has the allis-chalmers pump line. I2I
  3. insult2injury

    Grid for CFD

    Some packages have built in features to help you evaluate/fix your mesh. I2I
  4. insult2injury

    Bottom Blowdown - Required Flow

    Most likely, the blowdown tank/vent was incorrectly from the start. Using a smaller valve may be an option, provided you are still able to clear out the drum effectively. It may require you to blowdown more frequently. I2I
  5. insult2injury

    Relief Valves on Deaerator

    See the following excerpt from the HEI deaerator standard. I2Ihttp://files.engineering.com/getfile.aspx?folder=8542a288-d25f-4956-8f81-744e9d8870f0&file=HEI_EXCERPT.JPG
  6. insult2injury

    Steam Valve back pressure

    1. This is a common condition. 2. 3% is the allowable accumulation for a section I valve. I2I
  7. insult2injury

    Back Pressure Regulating Valves

    Two parallel flow paths = less resistance than 1 flow path = lower pressure I2I
  8. insult2injury

    Vent and drain

    If your high point and low point is 5 meters apart, then 5 meters is the correct answer; if they are 10 meters apart, then 10 meters is your answer. Is there something I'm not understanding? I2I
  9. insult2injury

    A 335 grade P5 +Any chance of having it at 745 C temperature?

    There are allowances in the Codes for abnormal temperature/pressure excursions providing the yield stress is not passed; however, a 10 hour process would not fit into this category. I2I
  10. insult2injury

    Tutorials for Boilers, DA tanks, steam systems

    Try the B&W or Combustion Engineering books. I2I
  11. insult2injury

    Relief valves

    Also.....for backpressure and blowback concerns I2I
  12. insult2injury

    Isothermal Tail Gas Calc - Darcy Friction Factor?

    I believe that the factor of 4 is a result of how the characteristic hydraulic diameter is defined. I2I
  13. insult2injury

    Multistage RO

    Multiple orifices are used to avoid cavitation. I2I
  14. insult2injury

    NPSH margin and ANSI/HI 9.6.1

    Without knowing the specifics of the plant, 10% is probably too low and 80% is most likely overkill on the margin. Most that I've been involved with operated in the 30%-50% range. You need to look at NPSH not only at design conditions but also at runout. Also confirm whether the margin is...
  15. insult2injury

    When are expansion joints in the suction required?

    Sometimes, it is also wise to include them if: - the pipe is not routed/designed and loads are unknown - the pump is not purchased and allowable loads are unknown This may not result in optimal solution, but it does prevent costly rework in projects where activities are a little out of sync. I2I
  16. insult2injury

    Steam ejector design

    Birgenheier paper: http://www.graham-mfg.com/downloads/23.pdf I2I
  17. insult2injury

    NPSH margin and ANSI/HI 9.6.1

    Don't forget that specifying too much NPSH margin may not be desirable either as it could have adverse affects on the pump/system. I2I
  18. insult2injury

    A few words to mechanical engineers

    In my experience, the boiler is usually hung from the top, not supported from the bottom up. What type of boiler is it? Manufacturer? I2I
  19. insult2injury

    Safety valve setting

    For a large boiler with multiple SRVs, the set pressures will not all be the design pressure. I2I
  20. insult2injury

    Using oversized PSV

    If there is sufficient margin between the operating and set pressure and the only relief scenario is a fire, then there is probably no issue with using an oversized valve. In the event of a fire where the valve opens, there may be some additional damage to the valve, but it would most likely...

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