Are there any specified time limits for removing interlocks? Which file requires it?

Yes, isn’t there a ticket for removing interlocks?

Experts usually say when conducting an examination, \"Let me take a look at the record of sequential removals.\"

Was there a document from the Safety Supervision Bureau before stating that the disconnection of interlocks could not last more than a month?

Safety Supervision General Office Document No. 3 [2013] 88: Guidelines for Strengthening Safety Management in the Processing Process (16) Establish and continuously improve equipment management systems. Establish a management system for equipment records. Enterprises should number all equipment, establish equipment registers, technical archives, and a management system for spare parts, and develop procedures for the operation and maintenance of such equipment. Equipment operators and maintenance personnel must undergo specialized training and qualification assessments, and the results of such training and assessments should be recorded and archived. Establish a management system for monitoring (inspecting) device leaks. Enterprises need to identify and analyze the potential locations of leaks, the types of materials involved, and the maximum amounts that can leak. Regularly monitor (inspect) the dynamic and static sealing points of the production equipment, and address any issues found promptly. Regularly calibrate various leak detection and alarm instruments to ensure their accuracy and effectiveness. It is necessary to strengthen corrosion prevention management, identify inspection areas, conduct regular tests, and establish a testing database. Increase the frequency of inspections in key areas to promptly detect and address any thinning of the walls of pipes and equipment ； Regularly evaluate the anti-corrosion effectiveness and determine the remaining service life of the equipment, so as to promptly identify and replace those devices that pose safety risks. Establish an electrical safety management system. Enterprises should establish management systems for the operation, maintenance, and repair of electrical equipment and facilities. Regularly conduct safety and reliability analyses as well as risk assessments of corporate power supply systems. It is necessary to establish management systems for the inspection and maintenance of explosion-proof electrical equipment and wiring. Establish a safety management system for instrument automation control systems. Before putting into use the instrument automation control systems for newly built (renovated or expanded) units and units undergoing major repairs, as well as before restarting those instrument automation control systems that have been out of use for a long time, inspections and verifications must be carried out. It is necessary to establish a sound routine maintenance system for instrument automation control systems, as well as systems for approving the shutdown of safety interlock protection systems, changes related to such systems, and actions taken by technical supervisors. (23) Strict change management. Process technology change. These mainly include production capacity, raw and auxiliary materials (including additives, catalysts, etc.) and media (including changes in composition ratios), process routes, flows, and operating conditions, process operation procedures or methods, process control parameters, instrument control systems (including changes in safety alarm and interlock setpoints), as well as changes in utility services such as water, electricity, steam, and air. Changes to equipment and facilities. This mainly includes the upgrading and renovation of equipment and facilities, replacement with different types (including changes in model, material, and safety features), changes in layout, changes in spare parts and materials, changes in monitoring and measuring instruments, changes in computers and software, changes in electrical equipment, and the addition of temporary electrical equipment. Manage changes. These mainly include changes in personnel, suppliers and contractors, management organizations, management responsibilities, management systems, and standards. Safety Supervision General Administration Document No. 3 [2014] 116: Guidelines for Strengthening the Management of Safety Instrumented Systems in the Chemical Industry (VII) Strengthen the operation and maintenance management of safety instrumented systems in chemical enterprises. Chemical enterprises must develop operation and maintenance plans and procedures for safety instrumented systems to ensure that these systems can reliably perform all their safety-related functions, thereby achieving functional safety. The safety instrument functions shall be subject to regular and comprehensive inspection and testing in accordance with inspection and testing cycles that meet the requirements for safety integrity, with the testing process and results recorded in detail. It is necessary to strengthen the management of failures in equipment related to safety instrumented systems (including equipment malfunctions, interlock actions, false operations, etc.) as well as their analysis and handling, and gradually establish a database for records of such equipment failures. It is necessary to standardize the selection of equipment related to safety instrumented systems, establish systems for the approval and evaluation of such safety instrumented equipment as well as procedures for approving changes, and continuously revise and improve these systems based on the actual usage in enterprises and equipment failures. Safety Supervision General Office Document No. 3 [2012] 103: Notice on Issuing the Guidelines for the Identification and Rectification of Hazardous Potential in Chemical Enterprises. Guidelines for the Identification and Rectification of Hazardous Potential in Chemical Enterprises. 4. Contents of Hazard Identification. 4.3.3 On-site process safety conditions, which mainly include: (1) Management of process cards, including their creation and modification, as well as on-site control of process parameters ； (2) Management of on-site interlocking, including interlocking management systems as well as the activation, deactivation, and restoration of on-site interlocking ； (3) Process operation records and shift handover details ； (4) On-site management of inspection, sampling, operations, and maintenance for highly toxic substances.

There is no requirement regarding the time at which interlocking can be disabled; if you have a valid reason, it’s perfectly fine not to do so at all. However, in the event of an accident, the person who approved the disabling of the interlocking will have to share the responsibility along with the person who actually carried out the disabling. So... try not to touch the safety interlocks. If it’s necessary to do so, follow the proper procedures, at least to absolve yourself of responsibility.

Is there a 30-day limit?

I haven’t heard of it; I only know that there is an assessment of self-control, with a requirement for a 100% utilization rate of interlocks. If it’s removed, it will recover as soon as possible – what’s there to discuss about that? This is related to safety; security checks are conducted daily to verify the operational rate of interlocks. Is it really necessary to worry about whether it should be 30 days or several months? Reply to me as soon as possible if you can; if two out of three fail, then choose between the remaining two. Just go ahead and use them for now – why remove them when an alternative route is available? Changing the interlock is also quite troublesome... If it needs to be removed on a long-term basis, it’s best to make the interlock changes as soon as possible and simply delete that interlock.

There is an expert in inspection within the group who requires that a ticket for disabling interlocking be issued every 30 days Is there any evidence?

It might refer to the interlock inspection mechanism; each company has different requirements, but as long as it meets the specified standards, an interlock inspection mechanism is necessary.

This post was last edited by Yangyang007 on 2020-11-17 at 16:30. If it is a rule established within the group, it should be followed according to those internal rules； Regarding the time limit for removing interlocks, there is currently **no clear regulatory basis; it is generally determined by the companies themselves (with a maximum of 6 months).** ； However, the removal, deactivation, or bypassing of interlocks requires change approval procedures, and a risk analysis is also necessary