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HDPE / LLDPE

Service of CA-1AS in HDPE application
During operation, this CA-1AS strokes every 20 seconds and is typically operate for 3 years before service.

HDPE (high density polyethylene) and LLDPE (linear low density polyethylene) are the products from ethane thermal cracking and fluid catalytic cracking (FCC) processes. They are one of the most versatile plastic materials manufactured because of their high strength-to-density ratio, higher temerature tolerance, and resistance to many solvents. HDPE is used in the manufacture of rope, liquid storage tanks, tables and chairs, pipes and engineered lumber, and many other products. LLDPE is used in plastic wrap, toys, containers, flexible tubings, and more.

Valve complications during the production of HDPE or LLDPE include:

  • an erosive powdery or sticky media build up
  • high cycle rates typically over 150,000 cycles per year
  • the continuance of polymer formation reaction inside the valve
  • fugitive emissions exposure to volatile organic compounds (VOC) used as solvents—such as cyclohexane, hexane, isobutane—in certain technologies

MOGAS ball valves offer many advantages over other valves:

  • smooth straight-through, full bore path
  • larger stem for higher torques
  • sharper leading edge seats that cuts through forming polymers and wipes ball surface with each cycle
  • minimal cavities between ball and body internals
  • recessed seats are protected from continual exposure
  • packing area is protected from potential media erosion, maintaining integrity of stem seal area while reducing risk of fugitive emissions
  • non-rising stem design meets EPA VOC packing leakage standards for greater number of cycles

Typical Operating Conditions:
  • Moderate temperature 50 – 250° F (10 – 121° C)
  • High pressure 100 – 950 psig (6.9 – 65.5 bar g)
  1. Fresh Ethylene Feed
  2. Dryed Ethylene
  3. Fresh Catalyst
  4. Catalys Feed Tank
  5. Catalyst Vent Filter
  6. Nitrogen
  7. Fresh Comonomer
  8. De-Gassed Comonomer
  9. Comonomer Guard Bed
  10. Hydrogen
  11. Polimersization Reactor
  12. Polimersization Reactor Overhead
  13. Recycle Blower
  14. Raw Polymer Degassing
  15. Purge Gas Recovery
  16. Purge Tower
  17. Condenser
  18. Comonomer Seperator
  19. Comonomer Vent Reconvery
  20. Final Polyethylene Powder
 
  • Heat Exchanger (not shown)
  • General Ball Valves (not shown)
  1. Fresh Solvent
  2. Fresh Comonomer
  3. Recycle Solvent
  4. Fresh Ethylene Feed
  5. Hydrogen
  6. Fresh Catalyst
  7. Nitrogen
  8. Pressurised Nitrogen
  9. Polimersization Reactor
  10. Flash Tank
  11. Recycle Condenser
  12. Recycle Solvent Tank
  13. Purge Column
  14. Heavys Inlet Column
  15. Nitrogen Recovery Unit
  16. Heavies Solvent
  17. Lights Solvent
  18. Lights Outlet Column
  19. Heavies Outlet Column
  20. Final Polyethylene Powder
 
  • Heat Exchanger (not shown)
  • General Ball Valves (not shown)
  1. Fresh Feed – Ethylene
  2. Dried Ethylene
  3. Pressurized Ethylene
  4. Catalyst
  5. Co-Catalyst
  6. Hydrogen
  7. Nitrogen
  8. Co-Monomer
  9. Recycled Co-Monomer
  10. Dryed Co-Monomer
  11. Polymerization Reactor
  12. Deactivator
  13. Raw Polyethylene
  14. Flash Tank
  15. Desolventizer
  16. Recovered Raw Solvent and Co-Monomer
  17. Lights Solvent
  18. Receovered Co-Monomer
  19. Recovererd Solvent
  20. Dryed Solvent
  21. Seperated Solvent
  22. Pressurized Solvent
  23. Heaves Solvent
  24. Final Polyethylene Pelet Product
 
  • Heat Exchanger (not shown)
  • General Ball Valves (not shown)
 
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