Talking about the safety of hot work in the pipe g

2022-10-12
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Talking about the safety of hot work in the pipe gallery of the plant area

according to Hg "safety regulations for hot work in the plant area", the hot work in the pipe gallery of the plant area is class I hot work. It is generally believed that the fire safety measures for the pipe gallery in the plant area are relatively simple and less dangerous. In fact, if targeted safety technical measures are not taken according to the specific situation of the site, and the accident is not well considered, unexpected accidents will also be caused. Therefore, the management of hot work in pipe gallery must be strengthened to ensure the safety of hot work

I. characteristics of hot work in plant pipe gallery

1. Work at heights

2. it is difficult to clean and replace

3. there are many units involved

4. There are many accidents

II. Handle relevant procedures

1. Handle the hot work safety certificate. For the hot work permit of the pipe gallery in the plant area, the hot work unit shall designate a special person or the person in charge of the hot work project to apply to the production workshop in the area where the hot work pipeline is located with the "equipment maintenance safety work permit", which shall be countersigned by the plant production dispatcher and approved by the safety technology department and the fire department

2. The person who issues the hot work safety certificate must go to the hot work site to verify the site conditions, and prepare 5 Whether you can test your own samples: set targeted safety technical measures

3. Before approving the hot work permit, the approver of the hot work permit must go to the hot work site to accurately understand the content of the hot work, the hot work pipeline, the medium in the pipeline and other specific conditions, carefully check or supplement the safety technical measures of the hot work, confirm that the safety technical measures are reliable, and review whether the hot work permit is handled in accordance with the relevant safety requirements. After confirmation, the hot work of the project can be signed and approved

4. a work permit for safety at heights must be obtained

5. Under the hot work point, if it is a road, you must apply for the "open circuit safety work permit"

6. When hot work is carried out on the pipe gallery next to the railway, the railway transportation department must be notified to avoid the train travel time as far as possible. If the train with dangerous chemicals passes or stops, the hot work must be stopped immediately

III. take isolation, cleaning and other measures

1. The pipeline to be used for hot work must be completely isolated from the production system, and the sources of flammable, explosive, toxic, corrosive media and steam must be cut off to ensure the safety of hot work. Blind plates shall be added by the workshop to which the pipeline belongs

2. Pipelines with flammable, explosive, toxic and corrosive media should be thoroughly cleaned and replaced, and samples should be taken at representative places for analysis

3. according to the requirements of hot work analysis, hot work must be carried out within one hour after sampling (provided that the hot work analysis is qualified). If the sampling analysis is unqualified, the cause must be found and the replacement analysis must be cleaned again. If the interval of hot work is more than 2 hours, the hot work analysis must be carried out again

4. if the hot work pipeline is closely separated from the nearby pipelines with flammable, explosive, toxic and corrosive media, effective isolation measures must be taken

5. For ditches, hot work analysis must be carried out. If necessary, open two or three covers at the front and rear of the hot work point to facilitate gas emission

IV. check before hot work

1. Before hot work is carried out on the pipeline on the pipe gallery, the hot work part must be confirmed first. If there are many pipes, they must be marked to prevent accidental fire

2. check whether there is splashing and contamination of corrosive media near and above the operation point

3. Before hot work, check whether there is leakage in the pipeline around the hot work point on the pipe rack. In case of leakage, find out the leaked substance and take effective isolation measures if necessary

4. Inflammables and explosives must be completely removed around the pipe gallery welding and cutting operation site and within the scope of falling welding slag sparks

5. Check whether there are water seals, underground wells, open ditches, underground ditches and underground concealed works that may leak flammable and explosive gases around the site. Carry out chemical treatment and fire analysis for these parts, and take reliable shielding measures

6. check whether the vent pipe of the storage tank around the hot work is the area where sparks may splash. If so, isolation measures must be taken to prevent accidents. All cable trench covers on the ground shall be tightly covered or covered to prevent fire stars from splashing in

7. before the hot work, the manual Rockwell hardness tester should be checked from the top. The operation is simple. Within 10m around the vertical below the hot work (the cutting direction and wind direction should also be considered, and the wind speed due to the lack of understanding of the test method of the fatigue testing machine), the inflammables should be removed, and there should be no leakage of flammable gas and flammable liquid. Reliable safety measures shall be taken for equipment and pipelines that cannot remove inflammables and inflammable media

8. The scaffold and scaffold board erected on the pipe rack should be checked in advance

9. all preparations should be sufficient. Before hot work, the required fire extinguishers, fire wrenches and other equipment and tools must be prepared completely without omission

10. there should be enough safety distance between the gas cylinder and the hot work point, and fireproof materials should be used to block it if necessary. Dissolved acetylene cylinders and oxygen cylinders shall not be close to the heat source, exposed to the sun, and placed directly under the high-voltage power line and production pipeline

11. There must be a specially assigned person under the hot work point, and a warning line must be set up to prohibit pedestrians and vehicles from passing through the area where sparks may splash

12. Full size of the first piece this time (15 × 6 meters) in windy weather after the curing and demoulding of the composite fuselage wall panel process parts, it is necessary to analyze the direction and range of sparks that may float. Based on this, measures such as catching fire discs, installing iron shields or asbestos board (cloth) fences to catch slag, preventing sparks from splashing, or delimiting the range of sparks splashing should be taken

v. other

1. Hot work must be kept at a certain distance from the wires, or protective measures must be set, or power failure

2. The welding grounding wire shall not be overlapped on other pipes, metal objects, power and instrument protective sleeves. The climbing tools should be firm and reliable. The flexible wire of the welding handle and the oxygen (acetylene) leather pipe should be fixed on the pipe gallery, and should not be wrapped around the body or work on the back

3. it is forbidden to throw down the welding rod head and the cut iron block directly

4. Welding and cutting equipment should be left on the ground and kept a safe distance from the hot work point. Special personnel must be assigned to monitor it in order to cut off the power or gas source in case of emergency

5. If the interval of hot work is more than 2 hours, the hot work analysis must be carried out again. If the original medium of the pipeline is inflammable and explosive, and the hot work is interrupted for more than half an hour for some reason, if it is necessary to carry out hot work again, it should be re sampled for hot work analysis, and the hot work can be carried out again only after the hot work analysis is qualified

6. when walking on the pipeline, you should concentrate and pay attention to anti-skid and anti tripping

7. comply with relevant safety protection standards, especially personal protective equipment, tools and protective facilities should be complete and effective, and wear and use reasonably. For the fastening method of safety belt, it is best to use high hanging and low use, followed by parallel fastening, and it is forbidden to hang low hanging and high use

8. After the completion of hot work, the guardian must comprehensively check with the hot work personnel and the hot work project leader whether there may be latent kindling around the site, and can leave the site only after confirming that there is no fire hazard. If necessary, the unit shall designate a special person to conduct night inspection, because some flames can't be seen in the daytime and can only be found at night

9. it is forbidden to cross work up and down

10. Hot work shall be stopped in case of strong wind above level 5

11. determine the emergency escape route

12. comply with other relevant requirements of the safety regulations for hot work in the plant, safety regulations for work at heights, and safety regulations for open circuit work

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