Results 1 to 3 of 3
  1. #1
    Join Date
    Jun 2022
    Location
    Saudi arabia
    Posts
    3
    Rep Power
    0

    Grasso Compressor Oil carryover



    Gents,
    Dealing with an issue and need your suggestion please...
    1)We have Grasso P type screw compressors (Model: PR-P36S-28) working on NH3 for cold store plant. Our LS compressor is under breakdowna and replacment underway. Currently running Swing and HS compressors.
    2) Our Swing compressor oil separator is constantly showing low oil level from sight glass(extremly bottom) even after charging oil. SP= 2.3 bars, DP =11.7 bars, OP =14 bars, DP for fine fiters =3.2 bars as everything is normal. We already replaced the fine filter catridges and oil filter as well with proper torque(this problem is not after changing and is before).
    3) We have cleaned the return line and its filter, flushed the service valve line to separator.
    4) When we are depressurising, oil level is returning back to separator from compressor.
    Need your guys opinion please....

    Thanks & BR.



  2. #2
    Join Date
    Apr 2009
    Location
    Durban
    Age
    39
    Posts
    24
    Rep Power
    0

    Re: Grasso Compressor Oil carryover

    Hi Amjad123,

    Check your suction valve NRV (non return valve). Maybe you losing oil on the spin back when the machine cycles off / shuts down. Also check the oil return from coalesce section is correctly set.

  3. #3
    Join Date
    Dec 2007
    Location
    australia
    Posts
    3,240
    Rep Power
    37

    Re: Grasso Compressor Oil carryover

    Amjad123,

    DP for fine filters is 3,2 bar, so this is pressure across coalescer filters in oil separator?
    If so, not correct, what is high side compressor pressure drop.

    Horizontal, or vertical oil separator?
    Type of oil cooler

    Oil return would expect to feel warm, maybe sight glass can indicate as well

    If you add oil, it disappears, are you then draining it from somewhere, does another machine oil level increase?
    Last edited by RANGER1; 27-09-2022 at 02:24 AM.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •