Accident case On August 7, 1996, the synthetic workshop of Shaanxi Jingjing Fertilizer Plant repaired and replaced the piston ring of the cycle machine. When the cylinder head was removed, the ammonia smell was heard. When one operator inspected the valve and tightened the inlet valve, the valve screw and wire The mother suddenly tripped the slippery wire, and the disassembled cylinder head was flushed out by the high-pressure airflow, which exploded in an instant, causing two deaths and four minor injuries.
At 10:15 on April 2, 1997, in the polymerization section of the PVC workshop of the Yanguoxia Chemical Plant in Gansu Province, when one operator opened the manhole cover of the polymerization kettle, the manhole cover was hit in it due to the residual pressure in the kettle. Chest, died after being rescued. At 8:50 on July 23, 1997, the cooling pipe flange at the top of the synthesis tower of Xingyi Chemical General Plant of Guizhou Province leaked. One worker took off when the flange was pressed, and 15 MPa of gas rushed out, causing the worker Falling from a height of 13m.
On June 8, 1999, a chemical industry company in Liuzhou, a desulfurization section of an ammonia plant, a vapor leak in the upper part of the molten sulfur kettle and entrainment of molten sulfur. When a worker on duty brought a compression bolt, the molten sulfur in the kettle was ejected, resulting in this name. Workers and another worker in the same position were severely burned, and one of them died.
On October 28, 2000, a normal fertilizer desulfurization post in a chemical fertilizer plant in Henan Province. After the operator took over, he found that the No. 1 molten sulfur 3 was effectively fixed in time to achieve a variety of safety education for the group education program. The content and form of education are different. To this end, the head of the team safety education should be good at digging and searching for the inherent laws, and timely fixing the effective experience and specific practices suitable for the characteristics of the team in the education process to achieve the proceduralization of different types of education. Such as the shift operation procedure under the simulated accident state of the team, the safety education program suitable for the characteristics of the process flow of each class of the team, and the production operation procedures specified in the operation instructions such as the Post Operation Law (normal production opening and parking, The combination of abnormal phenomena, etc., has gradually evolved into part of job skills training.
In short, team safety education is an extremely important part of enterprise safety education. Only by doing the above-mentioned work can we continuously strengthen the safety awareness of team members and improve their safety and technical quality in the long-term safety education atmosphere, and gradually realize People are intrinsically safe, so it is necessary to attract the attention of managers at all levels in the enterprise.
There was a gas leak in the large lid of the kettle. Then I took the hand to tighten the screw of the kettle. Because the screw was tight (with pressure), I used too much force, causing the bolt to loosen, the whole cover was misplaced, and the vapor sulfur paste was sprayed out. Second degree burns.
Analysis of the cause of the accident The causes of these accidents are various, with the following points: (1) Defects inherent in the equipment. For example (6), the 12-bolt design of the molten sulfur kettle cover is installed, leaving only 4, leaving hidden dangers. (2) There is no standard in the usual inspection, and the rectification of hidden dangers is not timely. (3) Failure to abide by the technical specifications of the post operation and safety technical regulations. (4) Lack of practical experience in handling accidents, such as tightening bolts. (5) Lack of security awareness and self-protection awareness. (6) Serious violation of the relevant provisions of the pressure fastening bolts.
There are other reasons, but the most direct cause is the violation of the regulations on the use of pressure-tight fastening bolts. When the pressure vessel and pressure pipeline are in working condition, if there is a leak in the part, the bolt cannot be tightened, removed, replaced or pressurized. Tightening the bolt under pressure will cause the stress of the bolt to be too high and break or the thread to be broken, so that the nearby bolt can withstand greater pulling force, and at the same time, it will lose its effect, causing more serious leakage of the sealing portion or flying out of the end cover. If some bolts are removed, the leakage of the sealing part will increase due to loose bolts. In some cases, some bolts will lose their effect. The other bolts will withstand greater tensile force. When the tensile force exceeds the tensile strength of the bolt material. The bolt will be broken, and the sealing part will be lost. The medium in the container and the pipe will be sprayed out in large quantities, causing an accident.
To properly handle the leakage of the sealing part in the production process, when handling the leakage, it is strictly forbidden to tighten and remove the bolt with pressure, and it should be handled according to the relevant regulations. It is imperative to tighten and remove the bolts with pressure and pressure on the containers and their pipes, valves and accessories. When it is urgent to tighten, it is necessary to stop, close the container inlet and outlet valves, remove the residual pressure, drain the internal medium, and take safety measures before repairing.
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