Detail of DL/T 712-2010

Introduction of DL/T 712-2010

1 Scope This standard specifies the selection principle and method for surface condenser and auxiliary cooler tube materials in power plant. It is applicable to the selection of tube material for surface condenser as well as surface heat exchanger that adopts water as cooling medium in thermal power plant and nuclear power plant. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies. GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 242 Metallic Materials - Tube - Drift Expanding Test GB/T 246 Metallic Materials - Tube - Flattening Test GB/T 3625 Titanium and Titanium Alloy Tube for Condensers and Heat Exchangers GB/T 4334 Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Stainless Steels GB/T 5231 Wrought Copper and Copper Alloys - Chemical Composition Limits and Forms of Wrought Products GB/T 5248 Copper and Copper Alloy - Seamless Tubes - Eddy Current Testing Method GB/T 7735 Steel Tubes - The Inspection Method on Eddy Current Test GB/T 8890 Seamless Copper Alloy Tube for Heat-exchanger GB/T 12969.2 Method of Eddy current testing for Titanium and Titanium Alloy Tubes GB/T 13296 Seamless Stainless Steel Tubes for Boiler and Heat Exchanger GB/T 14415 Water for Industrial Circulating Cooling System and Boiler - Determination of Solids Matter GB/T 17899 Method of Pitting Potential Measurement for Stainless Steels GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition DL/T 561 Guide for Chemical Supervision of Water and Steam in Thermal Power Plants DL/T 502.16 Analytical Methods of Steam and Water in Power Plants - Part 16: Determination of Ammonia (Spectrometric Method Using Nessler Reagent) DL/T 502.22 Analytical Methods of Steam and Water in Power Plants - Part 22: Determination of Chemical Oxygen Demand (Potassium Perchlorate Method) 3 Terms For the purposes of this standard, the following definitions and abbreviations apply. 3.1 pitting corrosion the local pit corrosion generated from metal surface and developing inwards 3.2 pitting potential the lowest corrosion potential at which pitting corrosion may be formed on passive metal surface in given corrosive environment 3.3 equilibrium potential of oxygen the electrode potential when the electrode reaction of oxygen in water solution is in balance 3.4 brass tube copper-zinc alloy tubes are collectively referred to as brass tube 3.5 copper-nickel alloy tube copper nickel alloy tubes are collectively referred to as copper-nickel alloy tube

Contents of DL/T 712-2010

Foreword i Introduction ii 1 Scope 2 Normative References 3 Terms 4 General Rules 5 Influence of Cooling Water Quality on Material Selection 6 Requirements for Condenser and Auxiliary Cooler Tube Materials 7 Principle for the Selection of Condenser and Auxiliary Cooler Tube Materials 8 Principle for Selection of Tube Sheet Material 9 Quality Inspection of Tube Materials Annex A (Normative) Test Methods for Stainless Steel Pitting Corrosion Annex B (Informative) Determination of Sediment Grain Size Distribution Annex C (Informative) Comparison of Varieties of Domestic Tube Materials and Foreign Tube Materials Annex D (Informative) Comparison of Physical and Mechanical Properties of Domestic Condenser Tube Materials