Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations cowski 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. timbones

    ASME stamp requirement for low pressure vessel?

    I stand corrected. I had assumed from the way the question was worded that it was already known that the area it was being imported to was under the ASME B&PV regulation requirements. Another option is to review your requirements and rerate the vessel to something equal to or less than 100 kPag...
  2. timbones

    ASME stamp requirement for low pressure vessel?

    The answer is, yes. Look in the front section of ASME VIII. The pressure cut-off is 100 kPag (there are some exceptions of course but I don't think any apply in this case). The design pressure isn't given as 2 Bar(a) for some strange reason? If it is, things may not quite so straight forward. Tim
  3. timbones

    Hi All, Can someone tell me as t

    I would be careful with the blanket statement that these valves must be car-sealed. In some cases, car-sealing is definately not the way to go. The pipeline company I used to work for locked open all of the PSV isolation valves because it made the valves tamper proof unless you had the key (CSO...
  4. timbones

    Floating Suction System

    Isn't writing a spec and a data sheet for a floating suction a little overkill. I purchased about a dozen tanks recently that had many floating suctions. All I specified was the minimum float height, maximum float height, outlet nozzle location, pipe diameter and material. For an existing tank...
  5. timbones

    Client in trouble

    Sounds like it doesn't meet the building code, so who cares what the heat loss is? Doesn't he have to fix it so it meets regulations? Why do it right, when you can do it twice.
  6. timbones

    high temperature heat transfer fluid

    You could use any number of fluids provided you keep it from boiling. You don't have to worry about the fluid approaching the exhaust temperature provided you put in the appropriate shutdowns. If you're worried about high temperature of media, put in a high temp shutdown for the turbine (also...
  7. timbones

    Required Motor Size (KW)

    The duty point is almost never where the maximum power point is. What happens if your head rise is much lower than expected under some conditions? Is the power required for the particular pump you have higher at the higher flow condition? Is the motor suitable for operation at this higher flow...
  8. timbones

    Open Vs Closed Circuit Cooling Towers

    You can put either system on the ground. In fact in my lines of work, which is oil, gas and power generation, the open loop cooling towers are almost always on the ground. Aesthetically, it is better to have them on the roof of a building because (out of site)=(out of mind). Cooling tower...
  9. timbones

    Open Vs Closed Circuit Cooling Towers

    I guess the first question is, why would you want to put in a closed circuit cooling tower? In my experience, the open circuit system is by far the more common way to go. I can't imagine going to a closed system unless I had some compelling reason such as keeping the cooling fluid seperate from...
  10. timbones

    BTU from Exhaust stack

    Provided that you know the composition and flow rate of your fuel, you can determine the exhaust flow with an oxygen sensor in the exhaust gas stack. The oxygen sensor basically tells you how much excess air above stoichiomentric conditions you have (neglecting CO and NOx is usually a reasonable...
  11. timbones

    GAs turbine performance calculation -Doubst, i need some help.

    If I recall correctly, the T5.4 temperature is not the temperature of the combustion gases, it is the temperature downstream of the HP turbine (which is why your calculation doesn't work). The temperature upstream of the HP turbine (TIT) is not measured (the temperature sensors just can't handle...
  12. timbones

    Brazed Aluminum plate HE inservice inspection

    Have you looked through the ALPEMA standard? If you haven't, it is well worth it (go to www.alpema.org). The only maintenance procedure they have is for leak detection. Other than that, no specific maintenance is required. Isolating leaks can be done with dry air or nitrogen or helium leak...
  13. timbones

    Pumping High Vapor Pressure Hydrocarbon Condensated

    How big a tank is it? Maybe you could put the tank on a nearby pipe rack? Or is this an already built thing? You could also look at raising the LLL. Another foot may make all the difference. Canned suction centrifugal may not be an option given your flow rate is so low. Another option might...
  14. timbones

    tanks in cold ambients

    jrjones, This helps a great a deal. I too live in the wilds of Alberta and so will these tanks eventually. It may seem obvious that for an Alberta location, notch tough steels to -40°C would be required but, this project I am working on is the 3rd phase of a plant. All 3 phases are engineered...
  15. timbones

    Piping hydrotest pressure

    "If a client is using standard wall 8-inch pipe and ANSI 300 flanges, then at 100C the flanges do define the system MAWP, design, and test pressures." I will go with Pete on this one and say this is only true where the client wants the "give me all you can" solution. But usually, also as Pete...
  16. timbones

    Any advantage to having FF flanges on a CS pump?

    Bingopin, I disagree that RF vs FF is acceptable if both flanges are steel. Although the ductility is not a problem, unequal loading on the gasket is. As you bolt the flanges together, the deflection on the outside of the flange from the bolting will induce a moment from the FF flange to the...
  17. timbones

    tanks in cold ambients

    I think if the pumping were shut-off for a few days, the operators would be forced to drain the tanks to prevent the product from freezing. There is no situation that I can think of where the tanks would be allowed to drop to -40°C with product in them.
  18. timbones

    tanks in cold ambients

    Consider an insulated oil storage tank operating in a cold ambient temperature. Does the tank material have to be suitable for operation at the cold ambient (in this case -40°C). The choice is to spec A-516-70N or just keep it cheap and go with A-36. Probably the only time the tank will get down...
  19. timbones

    Once-Through HRSG Duct Burner Flame Stability

    If you need that much heat, buy a bigger engine! Of course moving the power out of Fort Mac is a bit of a problem. Maybe you should consider fresh air fans on the front of the HRSG. It would boost the engine exhaust flow and allow quite a bit more duct firing. Not sure whether it has been tried...
  20. timbones

    Once-Through HRSG Duct Burner Flame Stability

    The good old EOR OTSG! Careful with these things, it seems like it's easy to screw them up! Is there a particular reason why you want to put the duct burner mid boiler somewhere? The recent EOR OTSG design I have seen (on the back of a GE7FA PetroCan plant at Mackay River) has the burner at the...

Part and Inventory Search