Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 516 views

    Dry Gas Seals

    Uploaded by

    shahan92ali
    The document discusses different types of seals used in compressor applications, including oil seals, dry gas seals, and labyrinth seals. It provides details on the components, operation, advantages, and critical issues of oil seals versus dry gas seals. Dry gas seals are shown to have a simpler system and lower total cost compared to oil seals but are more sensitive to H2S content. The document also outlines various dry gas seal designs including types of materials, secondary sealing elements, and buffering configurations. Diagrams illustrate the construction and pressure balancing aspects of oil seals and dry gas seals.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd

    Dry Gas Seals

    Uploaded by

    shahan92ali
    516 views52 pages
    The document discusses different types of seals used in compressor applications, including oil seals, dry gas seals, and labyrinth seals. It provides details on the components, operation, advantages, and critical issues of oil seals versus dry gas seals. Dry gas seals are shown to have a simpler system and lower total cost compared to oil seals but are more sensitive to H2S content. The document also outlines various dry gas seal designs including types of materials, secondary sealing elements, and buffering configurations. Diagrams illustrate the construction and pressure balancing aspects of oil seals and dry gas seals.

    Original Description:

    Presentation on dry gas seal

    Copyright

    © © All Rights Reserved

    Available Formats

    PPT, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document discusses different types of seals used in compressor applications, including oil seals, dry gas seals, and labyrinth seals. It provides details on the components, operation, advantages, and critical issues of oil seals versus dry gas seals. Dry gas seals are shown to have a simpler system and lower total cost compared to oil seals but are more sensitive to H2S content. The document also outlines various dry gas seal designs including types of materials, secondary sealing elements, and buffering configurations. Diagrams illustrate the construction and pressure balancing aspects of oil seals and dry gas seals.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    516 views52 pages

    Dry Gas Seals

    Uploaded by

    shahan92ali
    The document discusses different types of seals used in compressor applications, including oil seals, dry gas seals, and labyrinth seals. It provides details on the components, operation, advantages, and critical issues of oil seals versus dry gas seals. Dry gas seals are shown to have a simpler system and lower total cost compared to oil seals but are more sensitive to H2S content. The document also outlines various dry gas seal designs including types of materials, secondary sealing elements, and buffering configurations. Diagrams illustrate the construction and pressure balancing aspects of oil seals and dry gas seals.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    You are on page 1of 52

    Seals

    TOSI Giampiero
    Compressor Sealing
    Balancing Drum

    Shaft End Seal Shaft End Seal

    Balancing Line

    2
    OIL SEALS vs DRY GAS SEALS

    Advantages Advantages
    • Widely Used for HP applications • Simplified System
    • Positive Impact on rotordynamics • Total Lower Cost
    Critical Issues • No Oil Contamination
    • Very Sensitive to H2S content Critical Issues
    • Rotor-dynamic
    3
    Nomenclature
    Secondary vent (leakage from Outbord seal
    Primary vent (leakage from inbord seal
    + separation gas - atmospheric) STREAM 4
    + intermediate buffer gas - to flare) STREAM 2

    Intermediate buffer
    gas (N2) Separation gas (N2)
    STREAM 3 STREAM 5

    Seal gas STREAM 1

    Atmosphere
    (Bearing chamber)
    Inboard seal

    Carbon rings
    Product side

    Face
    Seat Face
    Seat
    Secondary seals Outboard seal Separation seal
    Intermediate Labyrinth
    4
    Gas Seal Operation
    Dry Gas Seal - Components

    6
    7
    Running clearance ~ 3 micron

    Carbon ring

    Human
    Hair groove depth = 10 micron
    diameter
    50-70
    microns

    8
    Dry Gas Seal Operation

    Process Side
    Dynamic behavior
    Spring thrust

    Static pressure

    Discharge

    9
    With 1 Atm pressurization
    a tip speed of 6 m/sec is enough
    to develop a pressure able
    to provoque the two discs separation

    10
    Seals for Low Pressure

    Elastomer
    secondary
    seals

    Softening
    resistance

    11
    Seals for High Pressure

    Carrier for primary ring and


    secondary seals

    Polymer secondary seals

    Extrusion resistance
    Temperature resistance
    High decompression rates
    Chemical resistance

    12
    Type 28 AT (o-ring)

    The disc carrier is over


    the disc in order to keep
    it in case of rupture

    O - ring
    Small plate to compensate
    the ununiformity of
    thermal dilatations due
    to different steel types

    13
    Critical
    Type 28 AT –
    Reverse Static Pressurization

    O-Ring
    extrusion

    15
    Clearance Betwenn Carbon Ring and
    Spring Carrier

    16
    17
    18
    19
    20
    O- rings limitations:

    • Limited life
    • Limited pressure
    • Limited temperature ~ 100°C
    • Suspect to chemical attack
    • Sticktion
    • Explosive decompression

    21
    22
    23
    24
    New design

    25
    Components
    27
    28
    T 28 XP

    29
    30
    31
    32
    33
    Nitrogen
    Buffer
    Primary
    Vent
    Clean Gas
    Injection
    TANDEM
    SEALS
    Job seals Tested at
    350 Bar Dynamic
    11000RPM

    Development Plan for


    430 Bar Dynamic
    13000RPM

    Pressure Filtered
    TRIPLE Outboard Intermediate Control Process
    Vent Vent (if required)
    SEALS Gas

    Experienced up to
    290 Bar Dynamic
    and 310 bar Static

    34
    35
    Triple Gas Seal

    36
    Materials
    Materials

    Metal parts X12Cr13


    17/4 PH
    Carbon Steel

    Face Graphite
    Cranite
    Silicon Carbide

    Seat Tungsten Carbide


    Silicon Carbide

    Secondary Seals Elastomer


    Spring Energized Polymer

    38
    Materials
    Metal parts ASTM A276, Gr.420
    (DIN 1.4122)
    UNS S42400
    (DIN 1.4313,
    DIN 1.4313S (NACE))
    Primary Ring carbon graphite
    Seat tungsten carbide,
    silicon carbide

    Secondary Elastomer
    sealing Metal spring
    elements energized
    polymer rings
    39
    Tertiary Seal Type 82 Contact Seals

    Springs

    Carbon

    Hardened sleeve on Shaft


    40
    In caso di aumento
    To 2nd del leakage la press
    vent N2 Supply
    differenziale scende
    sotto 0,5 Bar
    Bearing
    side
    0,5 Bar

    Seal
    side

    Hardened sleeve on Shaft

    41
    Auto-buffer

    42
    External Buffer Source

    43
    Dry Gas Seal P&I Diagram

    44
    Oil Seal Assembly

    45
    Oil seals

    46
    Oil Pressure Diagram in the Rings

    47
    Schematic

    48
    Oil Seal

    49
    Oil Seal P&I Diagram

    50
    Labyrinth Seals

    51
    Avional Labyrinths

    52

    You might also like