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Recent content by me3

  1. me3

    Pump Suction Press Vs. Vap. Press.

    Thanks for your reponces. For "25362", the data sheet is not metioning clearly where the suction press. is measured. But, it is written in the "Operating Conditions" section which talks mainly about the pump itself. In addition, tow values are given for the Suction Press. Max. and Rated. So, I...
  2. me3

    Pump Suction Press Vs. Vap. Press.

    In the data sheets of some new pumps I noticed that the pump Suction Press. is equal to or a bit less than the pumped liquid Vapour Press. at the pumping temp. Wouldn't that cause a cavitaion problem? In addition, the data sheets shows that there is NPSHa (few meters). But how come we have...
  3. me3

    Single Vs. Double Mechanical Seals

    When selecting a new pump for a process plant how to decide if you need a single or a double mechanical seal? Is this seal selection based on the pumping conditions (disch. press, vap. press, ..etc), or is there a definite rules for such selection? I searched in the API682 and API610, but...
  4. me3

    high motor load

    For a cetrifugal pump, the load should be minimum when the discharge valve is closed. But, in your case it is not. My first impression would be that there is something wrong with the motor itself, and not a mechanical fault. specially if the pump was not showing any upnormal noise, vibrations of...
  5. me3

    Mechanical Seal Barrier Fluid

    upm Thanks for your help. We do have both low level and low pressure alarms in the system. The problem is that the temp. is so low to have a suitable barrier flid with the right freezing point!
  6. me3

    Mechanical Seal Barrier Fluid

    The O-rings which are used in this seal are TEFLON/GLASS. The Wedge of the mechanical seal is made of special PTFE material.
  7. me3

    Mechanical Seal Barrier Fluid

    Actually it is a vertical, multistage pump. And I was mainly looking for a fluid which is having a freezing point below -104 deg.C (as this will be the easiest way to solve this problem). But, if I do not find one, I will go for modifying the seal system which will be a bit more complicated and...
  8. me3

    Mechanical Seal Barrier Fluid

    We used to use Propanol as a barrier fluid for our Ethylene Transfer Pump which uses a double, back to back mechanical seal arrangement, and which pumps Ethylene at -104Deg C (-155F). But we can not use this Propanol any more as it will contaminate the process in case of seal failure. Is...
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