Specific solutions for solving the burst leakage of small-diameter pressure pipes

The specific implementation process of solving the explosion of small-diameter pressure pipelines, countermeasures:

1 First of all, strengthen the skills training of the staff, analyze and find the reasons for the problems of small-diameter pipelines and pressure vessels blasting in the past

2 Enhance the sense of responsibility of employees, improve the quality of overhaul, make the overhaul process stand the test, and do not lose any details in the technical requirements.

3 The maintenance of the steam and water system should be reasonably improved to meet the design requirements; the pipeline should be equipped with expansion bend expansion joints; the fixed casing clamp should be installed; the pipeline direction should be reasonably arranged, and the slope should be implemented according to the regulations.

4 Open and close the valve slowly to make the water flow stable.

5 Improve water supply quality.

6 Strengthen the monitoring of operating conditions and follow the relevant operating procedures.

7Improved maintenance process method The cold bend method is used to make the elbow (the ellipticity does not exceed 12 of the pipe diameter?); The larger bending radius is used to reduce the corrosion of the internal medium (but not more than 4 times the nominal diameter); mechanical sawing is used Processing welding joints; processing and installing isolation devices, and strengthening the pipeline to prevent shaking and vibration.

8 Replace all pipelines that do not meet the requirements of the regulations without inspection, and install fixed splints and anti-wear pipes on unstable pipeline sections.

9 Replace the temperature-reducing jellyfish tube from the root of the water supply pipe outlet to the temperature-reducing water platform tee; the elbow is processed by mechanical cold bending; the support and hanger are arranged according to the regulations, and the expansion bend (G type or F type) is set; all welding The mouths are all sub-arc bottoming and electric welding cover welding methods.

10 Maintenance of water supply pipeline Replace the water pipe discharge pipe elbow and straight pipe section, regular sewage pipe elbow, bottom heating pipe elbow; elbow processing is bent by pipe bending machine; cutting pipe is all sawed; all welding ports Heat treatment after welding (heat treatment temperature is controlled at 720e750e).

11 Overheater drain pipe repair and replacement Part of the superheater drain pipe and elbow; all materials are made of 12CrMoV; elbow processing is bent by a pipe bending machine; all pipe cutting is done by sawing (electric or manual); all welds are welded Heat treatment (720e750e).

12 Small-diameter pressure pipes and elbows are inspected for size repair and furnace shutdown and non-destructive inspection of small-diameter pressure pipes and elbows are carried out with metal testing personnel; hardness, wall thickness and ellipticity measurement (alloy pipe wall thickness is not Super 25 ?, carbon steel pipe wall thickness is not more than 30, ellipticity is not more than the diameter of the pipe 12); visual inspection, cutting pipe sampling test.

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