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  1. Adam001

    phase angle on turbine

    If we have two probes on a turbine on one bearing and they are 90 degree apart now if the shaft is rotating in a pure ideal circular motion the phase angle between two readings is 90 degree , but if the shaft moves in elliptical motion or any other motion does the phase angle remains 90 or...
  2. Adam001

    Turbine curve

    I have a start up curve of steam turbine , from load 0 mega to 120 megawatt , the pressure at the inlet is constant so in this case the flow rate only is the factor that increases the load , then after 120 mw the pressure increases until the load reaches maximum , so 1. what affects the...
  3. Adam001

    Turbine control valve

    The graph of the control valve of the turbine has opening vs flow rate , so what if we increase flow rate from boiler at a fixed opening of valve will the pressure upstream valve increase ? Any other things will occur ?
  4. Adam001

    Understand a vibration graph of steam turbine

    There was a problem with a steam turbine and some vibration expert study it using a software calling vibro sight . A graph is called trend analysis and it is between time on x- axis and displacement on y-axis. The displacement starts from 0 , 10 , 20 , 30 , 40 , 50 and 60 and at each...
  5. Adam001

    Turbine vibration , phase angle meaning

    we are measuring vibrations on steam turbine on bearing 1 and bearing 3 . we found that amplitude of bearing 1 is slightly changing but at a same phase angle which is 262 degree . Also the amplitude of bearing 2 is slightly changing but at same phase angle which is 162 degree . I understand...
  6. Adam001

    API 650 statment

    In API 650 standard , item 5.2.1 C) , the design internal pressure shall not exceed 18 kpa , and since atmospheric pressure is 100 kpa so does this statement means that internal pressure shall not exceed 118 kpa ? also the external pressure shall not be less than 100.25 kpa ?
  7. Adam001

    condenser pressure

    In condenser of power plants , the vacuum is created due to condensation , now if temperature change in the condenser , the pressure will change to be the saturation pressure at the new temperature , so as I understand the temperature controls the pressure in the condenser not vice versa is that...
  8. Adam001

    condenser pressure

    In condenser of power plants , the vacuum is created due to condensation , now if temperature change in the condenser , the pressure will change to be the saturation pressure at the new temperature , so as I understand the temperature controls the pressure in the condenser not vice versa is that...
  9. Adam001

    pipe material

    we have a control valve at which water enters at temperature 140 c and pressure 10 bars , after the control valve causes pressure drop flashing occurs in a pipe that is 2 meters long , the pipe material is of class C3D (carbon steel)of 100 mm so do we leave the pipe as it is short or upgrade the...
  10. Adam001

    API 650

    In API 650 item 5.1.5.9 e , there is "Roof-to-shell connection details per Figure F.2 are permissible provided that the design effective area (crosshatched section) is greater than or equal to the design effective area provided by the minimum top angle size listed above " , I know how to...
  11. Adam001

    pressure vessel interanl pressure

    In Asme division 1 , for calculating required thickness for internal pressure , the rule has a term " P " which is internal pressure . now I have a general grawing of pressure vessel with internal pressure 3.5 bar gauge , so shall I use bar gauge ( barg) or absolute (bara) as they will give...
  12. Adam001

    API 650 clarification

    As per the image attached , In the code API 650 , item 5.1.3.5 , there is a phrase " the lap need not exceed 25 mm " , so does this mean if we exceeds the 25 mm there is no problem ? Also if the weld is single-welded lap joint and the lap is 50 mm is that accepted ?
  13. Adam001

    API 650

    In API 650 item 5.9.6 , does this top wind girder section modulus is for open tanks only ? As the fixed roof tanks have certain details in Appendix F
  14. Adam001

    pump head

    If we have a pipe contains water and has friction losses of 1 bar ,, static head 2 bars ,, and it is open at its ending to atm.pressure ,, now we need the pressure at the pipe exit to be 2 bars ,, so we get a pump at rated head equals 5 bars at the required flow rate ,, now when we install the...
  15. Adam001

    Flow rate changes ?

    Assume we have a pump that discharges to two branches , branch 1 and branch 2 which are in parallel . branch 1 has total head of 5 bar and needs flowrate = 10 m3/h , while branch 2 has total head of 2 bar and needs flowrate = 20 m3/h ,, so we choose a pump of H= 5 bars and Q= 30 m3/h ... we know...

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