Pay the most attention to equipment safety through

2022-08-01
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Pay attention to equipment safety throughout the life cycle

-- improve equipment safety in terms of technology, machinery and organization throughout the life cycle

in February this year, a serious accident occurred in the thermal power plant in Middletown, the United States, which caused many deaths. At that time, the equipment involved in the accident was still under construction, and it was planned to start production by the middle of this year. This raises a question: how will the safety protection function of the equipment play a role in ensuring safety before the equipment is officially put into operation

what are the possible causes of such failures? I am not making a belated decision, but I am sure that the overall safety protection performance of the equipment should be considered from the aspects of mechanical, electrical and automatic safety control; At the same time, attention should also be paid to the safety protection performance of resins used in plastic products and films throughout the service life of the equipment from the perspective of production, construction and organization. IEC 61508 standard is the basic standard for functional safety protection. Even if the application scope of equipment is limited to the scope of electrical, electronic and programmable control systems, the basic idea of mechanical safety protection can also be applied. This standard divides the possible faults into two categories: accidental faults and systematic faults

in case of accidental failure, such as sudden failure of electrical components, a failure probability can be specified for accidental failure. There are many measures to reduce accidental faults, such as using large-scale components, redundancy, or fault diagnosis and analysis system

typical systematic fault refers to software error or design error. These errors can clearly find out the causes of the errors. To eliminate these errors, only work organization measures can be taken, such as functional safety management FSM system

the accident and fault data in the past few years show that the most common errors are accidental errors. Through the efforts of the research team, we have successfully realized the SIL method to calculate and verify the working reliability of the equipment (see ne 93 "fault data collection" and NE 130 "equipment safety protection instrument"). We have also made great efforts to use the new fault diagnosis system to identify and describe the earth shaking changes in accidents and error advertisements. They can also highlight the power transmission effectiveness in other uses and achieve good results (see ne 129 "planned identification resource management"). But what countermeasures should be taken against systematic errors? Annex 2 of vdi/vde 2180 standard has made corresponding provisions on the safety protection measures to be taken in the whole service life of equipment in the field of automation technology

systematic errors do not only occur in the field of automation technology, but almost all errors in mechanical systems are systematic errors. In particular, when the mechanical system is abnormal occasionally, it can also be explained with systematic errors afterwards, so as to avoid similar failures in the future. These systematic errors do not happen accidentally. Therefore, they can also be managed by the security protection management system

in addition, the human factor should not be ignored. People who are not sil3 (third level safety certification) may also make accidental mistakes. Aluminum alloy window stainless steel sliding brace qb/t 3888 (1) 999, such as accidental lack of concentration, temporary amnesia of what they have done, etc. in this case, it is very effective for two people to operate at the same time. Lack of technical training will also lead to systematic errors, resulting in "congenital deficiency". Wrong information will also cause the operator to not get the correct information in time, resulting in the production of waste products. Human systematic errors can only be eliminated through the methods of the production organization, such as functional safety management FSM

however, the safety of the equipment is not only the safety after putting into operation, but also the safety protection of the equipment should be carefully treated during the technical transformation and shutdown of the equipment. When an assembly company does not know that the deactivated equipment has just been started and a flange has been removed, when the technicians do not know that the process equipment is producing new products and still adjust the process production equipment according to the limit data of the production of old products, and when the maintenance workers do not know that the pipeline is full of high-pressure media, it will not only be a problem of equipment safety, but also a major accident that may lead to personal injury or death. Therefore, the safety management system can not be ignored for the safety of equipment, and the following aspects should be considered

there is no objective conflict among product quality, availability of process equipment and safety. Despite the great pressure of production, production and technical leaders should also take time to solve safety technical problems

although there is a contract, there should be no shortage of professionals

give the production operators enough time to participate in the required professional training and continuing training

the information shall be reliably conveyed to each relevant person

the function of equipment operation instructions and document records cannot be ignored

summary: the safety of equipment does not mean that a series of acceptance inspections are completed during equipment acceptance, but that everything will be fine if it is handed over to equipment operators and maintenance workers. The safety guarantee of equipment needs to be upgraded continuously and requirements are put forward continuously. Within the whole service life cycle of equipment, the safety of equipment should be improved from the aspects of technology, machinery, organization, etc. (end)

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