Prevention method

1. Pay full attention to the safe operation of small pipes outside the furnace

Production units must change their concepts, unify their thinking, fully understand the hazards of small pipe blasting accidents outside the furnace and the need to take effective preventive measures, strengthen management, find out the actual working conditions of the small pipes outside the furnace, plug loopholes, and stop the outside of the furnace Vicious tube burst accident occurred.

2. Strengthen the management of design and construction

When designing and constructing, treat the small pipes outside the furnace with the corresponding grade of parent pipes, the pipes before and after the valve, improve the installation and maintenance process and quality acceptance standards of small pipes, and strengthen the inspection of weld flaw detection and installation process. And supervision to eliminate potential safety and quality hazards in the initial stage.

3. Strengthen the supervisory inspection during the production operation stage

The power plant shall include the small pipes outside the furnace in service into the scope of the metal supervision of the plant, study and formulate the supervision methods, cycles and standards for the small pipes outside the furnace, and implement them in combination with major and minor repairs. Especially weak links such as pipeline welds, elbows, valves, supports and hangers are key parts of metal supervision and regular inspection. The supervision and inspection of small pipes outside the furnace must form a system to ensure their safe operation.

4. Replace the unqualified pipe section

Carry out a general survey of small pipes outside the furnace. For the pipes or fittings with corrosion, erosion and thinning exceeding the standard, and welding defects exceeding the standard, they should be replaced or eliminated; for the air drawn from the superheater outlet header and steam header , Pressure signal and other small-caliber pipes, as well as small pipes, elbows, tees and valves connected to the main steam pipe, running for more than 105 hours, shall be replaced.