Nitrogen poisoning, where’s the gas mask?

A mechanical and electrical equipment Engineering Co., Ltd. did not wear gas masks or operate in accordance with the rules during the maintenance of the metering tank farm in the workshop, resulting in a nitrogen suffocation accident, resulting in one death and two injuries

1. accident process

the petrochemical workshop started to shut down for maintenance early before the accident, and completed the construction of the coil replacement project of propylene oxide metering tank in the morning. Then, according to the process requirements, the petrochemical workshop filled the propylene oxide metering tank with nitrogen and carried out the hydrostatic test. During the hydrostatic test, it was found that there were leakage points in the nipple. At the regular maintenance meeting held at about 16:30 p.m., the workshop decided to replace the sub, and Zhou and Hao were responsible for the arrangement and implementation. At about 17:30, Zhou and Hao informed Master Liu to replace the short flange joint in the metering tank. Master Liu instructed the workers to open the manhole cover of the propylene oxide metering tank without obtaining the work permit for entering the confined space. At that time, the workers did not take corresponding safety measures, and suffocated when they entered the tank through the manhole. Another two people were poisoned and suffocated in the rescue process, and one of them died after rescue< The direct cause of the accident is that master Liu did not take corresponding safety measures and suffocated when he entered the tank through the manhole there is a lack of unified coordination and management in the work safety of the maintenance and construction contractor; 1n the safety evaluation report of the company, the safety evaluation company did not analyze the dangerous and harmful factors of nitrogen in the process of production and maintenance and put forward suggestions on safety precautions, which is also the main cause of the accident nitrogen is colorless, odorless and tasteless at room temperature and atmospheric pressure, and can be liquid after pressure. When the nitrogen content in the air increases, people feel that their breathing is not smooth and they have a sense of suffocation. High concentration of nitrogen can cause simple asphyxia, such as headache, nausea, vomiting, chest tightness, chest pain, numbness of limbs, increased muscle tension, paroxysmal spasm, cyanosis, pupil narrowing, decreased light response and other crisis symptoms. 1n severe cases, the patient will be comatose or even die< 3. Preventive measures: relevant work safety departments should strengthen management, improve various systems, and strictly deal with violations of rules and disciplines strengthen the education and training of safety production for employees, and wear gas masks and other safety protection equipment for relevant work on site management must be strengthened to ensure the safety of workers this website solemnly declares: This article is organized by China labor insurance network. 1f you need to reprint it, please indicate the source

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