Hot Oil Flushing Methodology - PowerPoint PPT Presentation

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Hot Oil Flushing Methodology

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Hot Oil Flushing (HOF) is designed to remove contaminants from the manufacturing process/transportation/site assembly, or a contamination event during operation, of a lube oil circuit, by flushing hot oil through the circuit at a minimum of 150% of its operational flow rate, achieving a minimum of Reynolds 4000 number, a unit of measure for turbulent flow. – PowerPoint PPT presentation

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Title: Hot Oil Flushing Methodology


1
Hot Oil Flushing Methodology
2
What is Hot Oil Flushing?
  • Hot Oil Flushing (HOF) is designed to remove
    contaminants from the manufacturing
    process/transportation/site assembly, or a
    contamination event during operation, of a lube
    oil circuit, by flushing hot oil through the
    circuit at a minimum of 150 of its operational
    flow rate, achieving a minimum of Reynolds 4000
    number, a unit of measure for turbulent flow.

3
  • The theory being that contaminants such as pipe
    scale, welding slag and particles, are removed at
    150 of operational flow and wont contaminate
    the system at operational flow rate.

4
So what is the purpose of Hot Oil Flushing?
  • We HOF for several reasons,
  • New asset pre-commissioning,
  • Lubricant type change,
  • After a contamination event,
  • Scheduled maintenance,

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  • All OEM plant and equipment suppliers have their
    own methodology and specifications for
    pre-commissioning or hot oil flushing their
    assets.

7
  • Most conform to the two established standards
    ASTM D6439, and API 614. The Standards require
    you to capture bulk particles on the return
    circuit via a screen or filtration, to prevent
    tank contamination, as you will require this oil
    to achieve a cleanliness specification prior to
    start up.

8
  • BioKem Oil Services works with both ASTM D6439
    and API 614. Standards. WE believe its quite
    advantageous to capture all bulk particles and
    contaminants in the return circuit, to keep the
    lubricant within its ISO 4406 or NAS Class
    specification.

9
  • Also advantageous, is to apply fine filtration
    and vacuum dehydration, via kidney loop to the
    lube tank, not only are you removing contaminants
    and particles from the circuitry, but also
    purifying the oil to a minimum ISO 4406 code of
    16/14/12 (NAS Class 6), and moisture content to
    below 200 ppm.

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Service Oil or Base Flushing Oil?
  • Depending on the application, a service oil or a
    base oil similar to the final service oil can be
    used to flush the circuitry. This decision is
    based on the availability of service oil, volume
    of oil needed for the flush, and the timings
    between flushing and equipment entering service.

12
  • In some circumstances the equipment
    circuits/spools may not enter service for some
    time afterwards and the final selection of
    service oil may not have been made or awarded.

13
  • In this circumstance a base oil can be used and
    then the pipework blown dry with compressed air
    and a purge of nitrogen or similar gas used. If
    service oil is used then the HOF team will need
    to polish (fine filter) the oil ready for
    service.

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Purging the system
  • If the circuitry can be sealed at the conclusion
    of the flushing then nitrogen (or other inert
    gas) can be used to stave off corrosion. The
    methodology is to purge all oxygen from the
    circuits by venting the system whilst it is
    filled with inert gas. Correct safety protocols
    should be followed as Nitrogen can be dangerous
    in confined spaces.

16
What Next?
  • Should you require a professional service to HOF
    your circuitry, spools, coolers, lube tanks,
    manifolds then contact BioKem Oil Services
    www.biokem.com.au
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