2　Normative References

The clauses in following documents have become the clauses in this part after quoted by this Part.For dated references，any of subsequent changing pages（excluding the contents in corrigenda）or revisions are not applicable to this Part.For undated references，the latest edition of the following documents are applicable to this Part.

GB 50235-1997　　Code for Construction and Acceptance of Industrial Metallic Piping

GB 50375　　Evaluating Standard for Excellent Quality of Building Engineering

DL 5031-1994　　Technical Code of Erection and Acceptance for Electric Power Construction（Piping Section）

DL/T 441-2004　　Supervision Code for Creep Strain of Steam Pipe in High Temperature and High Pressure in Fossil Fuel Power Plant

DL/T 852-2004　　Guide for Boiler Start-up Commissioning Test

DL/T 869　　Technical Code of Welding for Power Plant