[Q&A] May 25, 2017
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What conditions must be met at the site where welding work will take place in order to obtain a welding permit? Answer: 1. When performing hot work outside equipment and containers, the combustible material content in the space surrounding them must be below 0.2% ； 2. When performing hot work inside equipment and containers, the combustible material content within them must be below 0.1%, and the oxygen level must be above 18% ； 3. All sources of combustible materials must be eliminated, and fire prevention measures are in place at the site ； 4. The unit performing hot work shall have a fire watcher ； 5. When working with fire near equipment and pipelines that are under pressure or carrying materials, special fire prevention measures must be in place. A fire work permit must be obtained after meeting the above conditions, and work may proceed only upon approval by the relevant authorities. Haichuan Network’s special May Day event, “Remembering the Glorious Moments,” warmly invites your participation: http://bbs.hcbbs.com/thread-1774529-1-1.html (Source: Haichuan Chemical Forum). A summary post for Haichuan Network’s May Day event, “Remembering the Glorious Moments”: http://bbs.hcbbs.com/thread-1774532-1-1.html (Source: Haichuan Chemical Forum). The first round of voting for the creative ideas contest (use your mouse to influence the results): http://bbs.hcbbs.com/thread-1776507-1-1.html
There is no leakage of toxic or harmful gases at the welding site, nor any leakage of flammable materials； Ensure that ditches and drains at the site where welding is carried out are properly covered ； Signature of the person performing the hot work and the person in charge of the unit carrying out the work ； Guardian present ； Flammable gas analysis at the hot work site is satisfactory ； A fire work permit can be issued only when conditions such as proper power connection are met.
1. When performing open-flame work outside equipment and containers, the combustible material content in the space surrounding them must be below 0.2%； 2. When performing hot work inside equipment and containers, the combustible material content within them must be below 0.1%, and the oxygen level must be above 18% ； 3. All sources of combustible materials must be eliminated, and fire prevention measures are in place at the site ； 4. The unit performing hot work shall have a fire watcher ； 5. When working with fire near equipment and pipelines that are under pressure or carrying materials, special fire prevention measures must be in place. A fire work permit must be obtained after meeting the above conditions, and work may proceed only upon approval by the relevant authorities.
1. The combustible gas level in the hot work area must be below 0.1% to be considered acceptable. 2. Wells in the hot work area, as well as material drainage lines and vent pipes, should be covered with fire-resistant cloth. 3. There must be a dedicated fire watcher.
1. Theoretical conditions for welding must be met; that is, there should be no flammable or explosive materials around the area where welding will take place. Moving equipment also needs to be stopped to prevent accidents. Power disconnection, removal of residues, and purging are tasks that need to be carried out in advance for welding on such equipment. 2. LEL detectors must be installed at chemical processing sites; if there is a hydrogen atmosphere, hydrogen detectors are required to measure the levels of various related gases. 3. In addition to the welder, a process engineer is required to be on site to supervise the welding work, in order to prevent accidents caused by improper operations by the welder.
1. When performing open-flame operations outside equipment and containers, the combustible material content in the space surrounding them must be below 0.2%； 2. When performing hot work inside equipment and containers, the combustible material content within them must be below 0.1%, and the oxygen level must be above 18% ； 3. Cut off all sources of combustible materials; fire prevention measures are in place at the site ； 4. The unit performing hot work shall have a fire watcher ； 5. Special fire prevention measures must be taken when performing welding or heating work near equipment and pipelines that are under pressure or contain materials. 6. The area surrounding the work site should be inspected to remove any combustible materials. 7. A sufficient number of fire extinguishing equipment must be available at the site where welding work is carried out.
1. When performing open-flame work outside equipment and containers, the combustible material content in the space surrounding them must be below 0.2%； 2. When performing hot work inside equipment and containers, the combustible material content within them must be below 0.1%, and the oxygen level must be above 18% ； 3. All sources of combustible materials must be eliminated, and fire prevention measures are in place at the site ； 4. The unit performing hot work shall have a fire watcher ； 5. Special fire prevention measures must be in place when working near equipment and pipelines that are under pressure and contain materials. With the above conditions met to obtain a hot work permit, work can proceed upon approval by the relevant authorities.
1. When performing open-flame work outside equipment and containers, the combustible material content in the space surrounding them must be below 0.2%； 2. When performing hot work inside equipment and containers, the combustible material content within them must be below 0.1%, and the oxygen level must be above 18% ； 3. All sources of combustible materials must be eliminated, and fire prevention measures are in place at the site ； 4. The unit performing hot work shall have a fire watcher ； 5. When working with fire near equipment and pipelines that are under pressure or carrying materials, special fire prevention measures must be in place. A fire work permit must be obtained after meeting the above conditions, and work may proceed only upon approval by the relevant authorities.
1. When performing open-flame work outside equipment and containers, the combustible material content in the space surrounding them must be below 0.2%； 2. When performing hot work inside equipment and containers, the combustible material content within them must be below 0.1%, and the oxygen level must be above 18% ； 3. All sources of combustible materials must be eliminated, and fire prevention measures are in place at the site ； 4. The unit performing hot work shall have a fire watcher ； 5. When working with fire near equipment and pipelines that are under pressure or carrying materials, special fire prevention measures must be in place. A fire work permit must be obtained after meeting the above conditions, and work may proceed only upon approval by the relevant authorities.
There is no leakage of toxic or harmful gases at the welding site, nor any leakage of flammable materials； Ensure that ditches and drains at the site where welding is carried out are properly covered ； Signature of the person performing the hot work and the person in charge of the unit carrying out the work ； Process supervisor present ； A safety supervisor is present ； Flammable gas analysis at the hot work site is satisfactory ； A fire work permit can be issued only when conditions such as proper power connection are met