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MEM376-CHAPTER 1, NAIF SHAHMI BIN SUKHAIMI (2018679698) - Coggle Diagram

- - - - Specific fixed type ratios
    - - motor positioning flexible
    - - Infinitely variable speeds
    - - adjustable speed with relatively high speed
- - - - How ?
        
        Liquid enters suction port
        
        Crescent shaped divider creates pressure.
        
        Liquid discharges smoothly through outlet
      - Advantages
        
        Easy to maintain
        
        Single adjustable end clearance
      - Interior gear drives the exterior drives
      - Disadvantages
        
        Requires moderate speeds
        
        Medium pressure limitations
      - Applications
        
        Paint
        
        Soaps
    - - Similar like external gear pump but the lobes do not make contact
      - How ?
        
        Lobes spin, volume expands at inlet
        
        Liquid flows into pump
        
        Liquid discharged through outlet
      - Advantages
        
        Pass medium solids
        
        Long term dry run
      - Disadvantages
        
        Requires timing gears
        
        Reduces lift with thin liquids
      - Applications
        
        Polymers
        
        Paints
    - - 2 gears(driving & driven) rotating against each other
      - How ?
        
        As gear spins, volume expandsat inlet
        
        Liquid flowsinto pump
        
        Liquid discharged through outlet
      - Advantages
        
        Hi speed
        
        Hi pressure
      - Disadvantages
        
        Fixed end clearances
        
        No solid allowed
      - Applications
        
        Chemical mixing and blending
        
        Acids and caustic
    - - How ?
        
        Liquid enters suction port
        
        Rotor spins, transferring liquid to the other side
        
        Liquid discharged at outlet
      - Advantages
        
        Develops good vacuum
        
        Can run dry for short periods
      - Rotor with spring-equipped vanes
      - Disadvantages
        
        Complex housing
        
        Not suitable for hi pressure
      - Applications
        
        Aerosols
        
        Aviation services
  - - - Process issues
      - Coupling-related issues
      - Mechanical seal leakage
    - - Pump does not deliver sufficient pressure
      - Pump does not deliver liquid
      - Pump vibrates at higher level
    - - Examine the couplings
      - Look at pump flanges for leaks
      - Inspect and clean the filters
  - - - Gases
      - Slurries
      - Liquid