7.1 Before work, you must wear the specified protective articles, and prepare tools for use according to the work content (if necessary, prepare lighting facilities such as traveling lights and emergency cables). Abide by relevant safety laws and regulations.
7.2 we should master the performance of water supply and heating equipment and the distribution of upper and lower water pipelines and heat pipe networks
, especially be familiar with the location of underground pipelines. Always patrol inspection to keep it in good condition.
7.3 Be responsible for the maintenance and renovation of the upper and lower water pipes, heating network pipes and control valves of the whole company
Personal safety should be given priority in the work process, especially the heating network pipes under pressure should be prevented from being scalded.
7.4 strengthen the maintenance of the pipeline system. If problems are found, handle them in time. If it is necessary to stop the large system due to planned maintenance or failure, please ask the competent leader in advance. Run, run, drip and leak should be controlled below 2‰.
7.5 one person is not allowed to work alone in ditches, wells and containers, and there must be more than two people, one of whom is responsible for monitoring outside. Personnel working in ditches, wells and containers, if they find peculiar smell or feel dizzy and nauseous, should immediately stop working and rest outside, and then enter the work after being treated. Where conditions permit, they should be well ventilated.
7.6 when emergency repair is carried out on the pipeline under pressure, decompression should be carried out first, and the running pipeline (steam and water) is not allowed to be overhauled in principle; If a larger valve is replaced, safety protection measures should be taken, and it must be installed by two or more people together to prevent bumping and smashing
7.7 The pipes with overlapping skin or cracks are not allowed to be used, and the maintenance valve must be familiar with its structure, technical requirements and maintenance technology. After maintenance, pressure test should be done, and the test pressure is 1.5 times of the working pressure, and it will not leak for 5 minutes.
7.8 The distance between the elbow weld joint on the pipeline and the bending point is at least equal to the pipe diameter,
but not less than: 1mm；; The distance between the weld and the support should be greater than 2mm；; If there is a large gap between the installed pipes and the interface, it is not allowed to use thermal extension to make them close, and a short pipe should be taken to make up, and the length of the pipe should be greater than 2mm, so that the stress at the joint will not be excessively concentrated, resulting in brittle fracture of the weld.
7.9 check the flange on the pipeline and the weld condition of the pipeline regularly, and handle the defects in time if found. There should be no trauma, pits, etc. on the flange joint surface.
7.1 For the preparation of reducer joint, the ellipticity shall not exceed the allowable value of the pipe with the same diameter, and the two ends are not perpendicular to the center line. For example, if the outer diameter of the pipe is less than φ18mm, it is allowed to be 1% of the pipe diameter; The allowable value of the outer diameter of the pipe is φ 133 mm ~ φ 529 mm, which is 1.5% of the pipe diameter; The eccentricity of the reducer shall not be greater than 2% of the outer diameter of the big end of the pipe.
7.11 For pipes with serious corrosion, cracks and sand holes, new pipes should be replaced or repaired,
to eliminate unsafe hidden dangers.
7.12 In order to reduce heat loss and prevent scalding, steam pipes and hot water pipes should be insulated. If polyurethane or rock wool is used for insulation, the neckline, cuffs and masks must be tied properly to prevent chemical fibers from entering clothes, touching the skin or entering the body.
7.13 After the work is finished, it is necessary to count people, arrange tools and clean the site to achieve civilized production.