1 Before you work, you must wear the specified protective equipment, and prepare the tools to be used according to the work content (if necessary, prepare lighting facilities such as running lights, emergency cables, etc.). Comply with relevant safety regulations and systems.

2 should master the performance of the company's water supply, heating equipment and upper and lower water pipelines and thermal network management

The distribution of the road, especially the location of the underground pipeline. Always check it and keep it in good condition.

3 Responsible for the maintenance and renovation of the company's upper and lower water pipelines, heat network pipelines and control valves

In the course of work, personal safety should be put in the first place, especially the hot air pipe with pressure to prevent burns.

4 Strengthen the maintenance and maintenance of the pipeline system. If problems are found to be dealt with in a timely manner, such as planning maintenance or failure, you need to ask the supervisor in advance when you need to stop the system. Run, run, drip, and leak should be controlled below 2 inches.

5 It is not allowed to work alone in trenches, wells and containers. There must be more than two people, one of whom is responsible for supervision outside. Persons working in trenches, wells, and containers, if they find odor or feel dizzy or nausea, should stop working outside to rest, and then enter the work after treatment. Ventilation should be done in places where conditions permit.

6 When repairing on a pressurized pipeline, decompression should be carried out first. The running pipeline (steam, water) is not allowed to be inspected in principle. If the larger Valve is replaced, safety protection measures must be taken. Installed by two or more people to prevent bruises and bruises

7 For pipes with folds or cracks, the valve must be familiar with its structure, technical requirements and maintenance process. After the overhaul, the pressure test should be done. The test pressure is 1.5 times of the working pressure and it is kept for 5 minutes.

8 The elbow weld on the pipe is at least equal to the pipe diameter to the bend point.

However, it shall not be less than: 100mm; the distance between the weld and the bracket shall be greater than 200mm; if the installed pipe has a large gap to the interface, it shall not be allowed to be tightly covered by heat extension, and the short pipe shall be taken up. The length of the pipe shall be greater than 200mm. In this way, the stress at the weld is not excessively concentrated, causing the weld to be brittle.

9 Regularly check the condition of the flange and pipe weld on the pipeline and find that the defects are disposed of in time. There should be no trauma, pits, etc. on the flange joint surface.

10 For the preparation of different diameter pipe joints, the ellipticity shall not exceed the allowable value of the pipe of the same diameter, and the ends shall not be perpendicular to the center line. If the outer diameter of the pipe is less than φ108mm, the allowable diameter is 1%; the outer diameter of the pipe is φ133mm. The allowable value of ~φ529 mm is 1.5% of the pipe diameter; the eccentricity of the reducer pipe shall not be greater than 2% of the outer diameter of the pipe head.

11 For pipes with severe corrosion and cracks and blisters, replace them with new ones or repair welds to eliminate unsafe hazards.

12 In order to reduce heat loss and prevent burns, steam pipes and hot water pipes should be kept warm. If you use polyurethane or rock wool to keep warm, be sure to tie the neckline, cuffs and masks to prevent chemical fibers from entering the clothes and touching the skin. Or enter the body.

13 After the work is completed, it is necessary to count the number of people, organize tools, clean the scene, and achieve civilized production.

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