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  1. Esbirinai

    Steel chemical cleaning - When to stop?

    We usually performe chemical cleanings to some equipments, like pumpes, piping, vessels, in a closed circuit usually with citric or phosphoric acid. I was told that the best way to know when to stop the cleaning (if visual inspection is not possible) was to do some total iron analysis. Is this...
  2. Esbirinai

    Underground Piping - Leak Detection Services

    I have several leakages on a long underground water piping (10") system. The piping is burried 3 meters under and We are desperate to find all the leaks. To make it more dificult we do not know the exact location of the underground pipes. Is there any European or US company that could do this...
  3. Esbirinai

    flange thickness - pressure test (circular plate)

    What is the minimum thickness a flange (circular shape) has to have on a equipment to be used on a pressure test? The data is: inside diameter = 408 mm diameter of flange = 580 mm Pneumatic pressure test = 13.5 Bar Material of Flange = A106 GrB (Carbon steel) Thanks
  4. Esbirinai

    flange thickness based on diameter and test pressure

    Does anyone knows the formula for dimensioning the flanges thickness to blind the vessels for hydraulic tests? The thickness is dependable of Test pressure and diameter of the circular flange. Tks ES
  5. Esbirinai

    Blind Flanged on reactor vessel - Thickness and shape

    The opening has a flange that supports the motor with a agitator. That flange has to come off with the motor and with the agitator to perform the hydraulic test. After blinding that opening there are other inlets on the vessel that will make it possible to pressurize, ES
  6. Esbirinai

    Blind Flanged on reactor vessel - Thickness and shape

    I need to performe a pressure hydraulic test on a reactor vessel which has a diameter of aprox 3 meters and an opening on the top of about 1,5 m diameter long.The pressure test will be 30 bar. I was thinking of installing a blind straight flange on the opening but i was told that the flange...
  7. Esbirinai

    diferent vibration values over time - further data

    I checked a ventilator (100 kw - 960rpm) and obtained different values of vibration. Values go from 4 mm/s to 11 mm/s. The ventilator has 8 blades (2*4 blades, two on 0º, two on 90º, two on 180º and two more on 270º) The spectrum returns only a peak near 64Hz which i presume to be from the...
  8. Esbirinai

    diferent vibration values over time

    Actually, There were two fans on site, they are exactly the same (axial flow fan). One of them is ok (rms 3 to 5mm/s) and the other has symptoms like tho one i described. The inlet flow is not varying on any of them. However, with a close inspection i found that the blades on this fan were...
  9. Esbirinai

    diferent vibration values over time

    I checked a ventilator (100 kw - 960rpm) and obtained diferent values of vibration. Values go from 4 mm/s to 11 mm/s. The ventilator has 8 blades (2*4 blades, two on 0º, two on 90º, two on 180º and two more on 270º) The spectrum returns only a peak near 64Hz which i presume to be from the blades...

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