100 QUESTIONS About Turbine Oil Acid Number (TAN)

100 QUESTIONS About Turbine Oil Acid Number (TAN)

1. What is Acid Number (TAN) in turbine oil?

2. What does TAN chemically represent?

3. Which compounds contribute to TAN increase?

4. Is TAN always related to oxidation?

5. Can TAN increase without oxidation?

6. What is the difference between TAN and acidity?

7. Which ASTM methods are used to measure TAN?

8. What is the difference between ASTM D664 and D974?

9. Why is ASTM D664 preferred for turbine oils?

10. What is the accuracy of TAN measurement?

11. What is the repeatability of ASTM D664?

12. What is the reproducibility of TAN results between labs?

13. What is the typical TAN of new turbine oil?

14. Why does new oil sometimes have non-zero TAN?

15. Which additives contribute to initial TAN?

16. How does TAN behave during early oil life?

17. What is considered a normal TAN trend?

18. What is an abnormal TAN increase rate?

19. What is the alarm limit for TAN?

20. What is the critical limit for TAN?

21. Should TAN limits be absolute or trend-based?

22. How fast can TAN increase in real systems?

23. What are the main causes of TAN increase?

24. How does oxidation increase TAN?

25. How does thermal stress affect TAN?

26. How does microdieseling affect TAN?

27. How does air entrainment impact TAN?

28. How does water contamination affect TAN?

29. Can hydrolysis increase TAN?

30. How does metal catalysis affect TAN?

40. How do copper and iron accelerate TAN increase?

41. How does varnish formation relate to TAN?

42. Can TAN increase before varnish appears?

43. Can varnish exist with low TAN?

44. What is the relationship between TAN and MPC?

45. Does TAN reflect soluble varnish?

46. Can TAN decrease while varnish increases?

47. How does antioxidant depletion affect TAN?

48. What is the relationship between TAN and RULER?

49. Which antioxidants influence TAN trends?

50. How does phenolic antioxidant depletion affect TAN?

51. How does aminic antioxidant depletion affect TAN?

52. Can TAN increase even with antioxidants present?

53. What is the TAN behavior near end-of-life oil?

54. Can TAN plateau after reaching a certain level?

55. What is the effect of oil replenishment on TAN?

56. Does top-up dilute TAN effectively?

57. Can TAN be masked by dilution?

58. What happens when fresh oil is added to high TAN oil?

59. Does TAN reduction mean oil health is restored?

60. How accurate is TAN in predicting oil failure?

61. What are the limitations of TAN as a parameter?

62. Can TAN be misleading?

63. What other parameters should be used with TAN?

64. How does TAN compare with MPC for varnish monitoring?

65. How does TAN compare with RULER?

66. How does TAN compare with FTIR oxidation?

67. How does TAN compare with interfacial tension?

68. Is TAN sufficient alone for oil condition monitoring?

69. What is the best combination of tests with TAN?

70. How often should TAN be monitored?

71. What sampling points are best for TAN measurement?

72. Does sampling temperature affect TAN results?

73. Can TAN vary across different parts of the system?

74. Is TAN uniform in the entire oil system?

75. How does cold vs hot sampling affect TAN?

76. Can contamination affect TAN measurement?

77. How does particle contamination influence TAN?

78. Can additives interfere with TAN measurement?

79. Can laboratory errors affect TAN trends?

80. How to validate suspicious TAN results?

81. When should TAN be re-tested?

82. How to compare TAN results from different labs?

83. What is acceptable deviation between labs?

84. Can TAN results drift over time without real changes?

85. What is the role of calibration in TAN testing?

86. Can TAN be artificially reduced?

87. How does filtration affect TAN? Can conventional filtration reduce TAN?

88. Can centrifuges reduce TAN?

89. Can electrostatic separators reduce TAN?

90. Can ion-exchange systems reduce TAN?

91. What mechanisms reduce TAN effectively?

92. Can chemical additives reduce TAN?

93. Is adding chemicals recommended to reduce TAN?

94. What are risks of TAN-neutralizing additives?

95. Can TAN be reduced below new oil levels?

96. What does very low TAN indicate after treatment?

97. Can TAN reduction improve demulsibility?

98. How does TAN affect water separation?

99. How does TAN affect foam tendency?

100. How does TAN affect corrosion risk?

101. How does TAN affect bearing life?

102. How does TAN affect servo valve performance?

103. How does TAN relate to sludge formation?

104. How does TAN affect oil color?

105. What is the economic impact of high TAN?

106. When should oil be replaced based on TAN?

107. When should TAN be controlled instead of oil change?

108. What is the best strategy to manage TAN in turbine oils?

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