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2 Normative References
The following references are indispensible for the application of this Guideline.For those with date noted，only their revisions noted with date shall be applicable to this Guideline，while for those without date noted，their latest revisions（including their all amendments）shall be applicable to this Guideline.
GB 264-1983 Petroleum Products-Determination of Acid Number
GB 9948 Seamless Steel Tubes for Petroleum Cracking
SH/T 3037 Calculation of Heater-Tube Thickness in Petroleum Refineries
SH/T 3074 Steel Pressure Vessels in Petrochemical Industry