GB/T 42591-2023 in English

Standard Framework and Technological Evolution

As the first national standard for special quality control in the field of gas turbines in my country, GB/T 42591-2023 integrates the requirements of international standards such as ISO 3977 and ASME PTC 22, and integrates the engineering practice experience of 15 drafting units including the Xi'an Thermal Engineering Research Institute. The evolution of standard technology presents three major characteristics:

Core quality control requirements

1. Design stage

Chapter 5 of the standard requires the use of a V-shaped development model to clarify the iterative process of conceptual design → preliminary design → detailed design. The key control points include:

• Compressor: surge margin ≥15% (5.5.3)
• Combustion chamber: NOx emission ≤50mg/m³ (5.5.4)
• Turbine blades: cooling efficiency ≥0.7 (5.5.5)

2. Manufacturing process

Chapter 6 stipulates 21 types of key component control items. Taking turbine moving blades as an example:

Key points for quality witness implementation

Appendix A Establish a three-level witness system:

1. Point H (shutdown for inspection): rotor overspeed test, cylinder water pressure test
2. Point W (on-site witness): bearing clearance measurement, combustion chamber assembly
3. Point R (document witness): material report, non-destructive testing record

Industry implementation recommendations

Recommendations for power generation companies:

• Establish an extended quality manual based on ISO 9001
• Set up a dual-post review mechanism for key processes
• Apply MES system to achieve quality traceability