DL/T 1966-2019 in English

Typical control case: Adjustment of the clearance of the steam shaft seal of the high-pressure cylinder requires double verification:

1. Lead wire measurement (S point mandatory on-site supervision)
2. Re-measurement with dial indicator (H point cannot be crossed)

Standard allowable deviation: radial clearance ±0.03mm, axial expansion clearance ≥2mm

1. Preparation of supervision plan should include:

• Special control plan for steam turbine/generator based on Appendix A
• Make a monitoring plan according to Appendix B (e.g., high-pressure rotor must be pumped out at S point)

2. Document management According to the requirements of Appendix E:

• Retain the original of the daily supervision report (for long-term archiving)
• Electronic archiving of non-conformity reports