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Dry gas seal Systems

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This slide describe seal gas system in compressor. This Slide is divided into three part: - What is seal gas ? - The function of seal gas? - Description Equipment in Seal gas systems

Published in: Engineering

Dry gas seal Systems

  1. 1. DRY GAS SEAL
  2. 2. WHAT IS “ DRY GAS SEAL “ ? - Gas-lubricated - Used for twenty years ago - Almost of the compressor use them
  3. 3. THE BENEFIT OF DRY GAS SEAL - Reduce leakage gas process - Reduce the complex of system support - Reduce failure of mechanical system - Reduce amout of seal oil
  4. 4. SEAL GAS SYSTEM
  5. 5. WHY USE TANDEM SEAL SYSTEM ? - There are many seal systems: primary seal gas, secondary seal gas and separation seal gas - Prevent process gas leak from secondary seal, allowing vent to atmosphere - High safety DRY GAS SEAL HANDBOOK
  6. 6. THE CONFIGURATION OF TANDEM SEAL GAS
  7. 7. TANDEM SEAL SYSTEM • Primary seal : Absorb the pressure drop and vent to atmosphere • Secondary seal: as beck-up seal of primary seal gas • Separation seal : prevent lube oil entering the seal gas • Barrier Seals : Tách biệt seal gas với shaft bearing, ngăn ngừa lube oil đi vào gas seal, đồng thời cũng là vách ngăn cuối cùng khi primary và secondary seal bị phá vỡ DRY GAS SEAL HANDBOOK
  8. 8. YÊU CẦU • Ap suất lớn hơn áp suất yêu cầu ở điểm kết nối 50 psi • Không có hạt rắn có kích thuớc lớn hơn 10 micron • Hạn chế tối thiểu luợng liquid trong khí • Giữ nhiệt độ cao hơn nhiêt độ dew point tối thiểu 200 F • Tốc độ dòng seal gas tôi thiểu 32 ft/s DRY GAS SEAL HANDBOOK API Standard 614
  9. 9. DRY SEAL GAS IN DQR ( WET GAS COMPRESSOR ) VENDOR DOCUMENT
  10. 10. VENDOR DOCUMENT
  11. 11. VENT • Sử dụng chênh áp xác định độ rò rỉ khí seal • Dấu hiệu nhận biết leakage: Lưu lựong dòng khí lớn + độ chênh áp qua orifice lớn DRY GAS SEAL HANDBOOK
  12. 12. DRY GAS SEAL HANDBOOK
  13. 13. DRY GAS SEAL HANDBOOK Warning PDI > 70 psi API 614 ( page 71 , 75) Require B3 > 75
  14. 14. QUESTION AND ANSWER
  15. 15. DRY GAS SEAL HANDBOOK Why flow rate of seal gas is controlled by different pressure controller ?
  16. 16. WHY PRIMARY SEAL GAS IS DRAINER CONTINUOUSLY WATER BUT THE SECONDARY SEAL GAS ISN’T ?
  17. 17. WHY OUTLET OF PRIMARY SEAL GAS IS VENTED TO FLARE BUT SECONDARY SEAL GAS IS VENT TO ATMOSPHERE ?
  18. 18. WHY NEED TO HEAT TRANCING WITH ONLY PRIMARY SEAL GAS ?
  19. 19. WITH SECONDARY SEAL GAS, WHY DON’T NEED TO HAVE A TRIP ALARM ?
  20. 20. SUMMARIZE • Three seal: primary seal, secondary seal and separation seal • Requirement on Seal Gas • Realize problems
  21. 21. LINK DOWNLOAD • DRY GAS SEAL HANDBOOK : http://tinyurl.com/DRYGASSEAL • API Standard 614 : http://tinyurl.com/API614
  22. 22. THANK YOU FOR LISTENING
  23. 23. DISCUSSION • When primary seal gas is normal, but secondary seal gas has problem, what should we need ? • Method ?

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