【Q&A】June 12, 2017
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What conditions are required and what procedures must be followed to carry out maintenance work inside equipment (towers, tanks, etc.)? Answer: 1. Before entering the equipment to carry out work, the power supply must be cut off; the power distribution panel should be used to do this, along with the installation of a warning sign that reads “Do not close the switch while someone is working inside.” 2. The source of materials must be cut off, the contents must be emptied and blind flanges installed; the area should then be purged with nitrogen, and air blown in until the levels of combustible gases and oxygen are within acceptable limits. 3. A supervisor should be assigned to ensure there is a means of communication between those inside and outside the equipment. 4. The access holes or ventilation openings of the equipment should be opened to maintain proper air circulation inside it. Procedures: Apply for the \"Equipment Entry Permit\" at http://bbs.hcbbs.com/static/image/hrline/4.gif. Petrochemical Zone – The \"Creative Ideas for Energy Saving\" campaign (the second phase is currently in full swing): http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1666758 (Source: Haichuan Chemical Industry Forum)
Answer: 1. Before starting work on the equipment, the power supply must be disconnected, and a warning sign stating “Do not close the switch while someone is working” should be placed in the control room. 2. Cut off the material supply – empty the material and install a blind flange – purge with N2 – blow with air until the levels of combustible gases and oxygen are within acceptable limits. ,3, Assign monitoring personnel～Determine the methods for communication inside and outside the equipment. 4. Open the equipment manhole or ventilation openings to ensure air circulation inside the equipment
1. Before starting work on the equipment, the power supply must be cut off; the electrical panel should be used to do this, along with the placement of a warning sign that reads “Do not close the switch while someone is working inside.” 2. The source of materials feeding into the equipment must be stopped, the contents must be emptied and blind flanges installed; the area should then be purged with nitrogen, and air blown through it until the levels of flammable gases and oxygen are within acceptable limits. 3. A supervisor should be assigned to ensure there is a way to communicate between those inside and outside the equipment. 4. The access holes or ventilation openings in the equipment should be opened to maintain proper air circulation inside the equipment. Procedures: Obtain the \"Equipment Entry Permit\"
Work permit (work order), work in confined spaces
For work in confined spaces, check for toxic gases and the like
Invoicing, isolation, qualified replacement, supervision personnel, safety measures
1. The medium must be properly cleaned, and gas analysis must show satisfactory results. 2. Good ventilation is required; forced ventilation systems should be installed if necessary. 3. Adequate internal lighting is needed (using safe power sources). 4. An external supervisor must be assigned to oversee operations inside. 5. All necessary protective equipment must be available. 6. An escape plan and corresponding facilities must be in place
1. Before starting work on the equipment, the power supply must be cut off, and the electrical panel operator should turn off the power and hang a warning sign that reads “Do not close the switch while someone is working.” 2. Cut off the material supply, empty the material and install a blind flange, then purge with N2 and blow with air until the levels of combustible gases and oxygen are within acceptable limits. 3. Assign surveillance personnel and determine the methods for communication inside and outside the equipment. 4. Open the equipment manhole or ventilation openings to maintain air circulation inside the equipment. Procedures: Obtain the \"Equipment Entry Permit\".
Depending on the specific tasks, the procedures vary as well. Procedures: Work permit (work order), confined space work, gas analysis report, temporary power usage, hot work, high-altitude work, non-destructive testing work, and other such procedures. Conditions: 1. The medium must be thoroughly cleaned, and gas analysis must show satisfactory results. 2. Good ventilation is required; forced ventilation systems should be installed if necessary. 3. Adequate internal lighting is needed (using a 36V safe power supply). 4. There must be someone outside to supervise operations inside. 5. All necessary protective equipment must be available. 6. An escape plan and corresponding facilities must be in place