【Analysis of Mechanical Equipment Accident Cases】---Analysis of the C5 Loading/Unloading Compressor Accident
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The purpose of the [Analysis of Mechanical Equipment Accident Cases] activity is to pool ideas and encourage constructive feedback; please determine the cause of the failure based on the description provided. Equipment information for C5 compressor accident analysis: This device is a compressor used for loading and unloading liquefied gas at gas stations; its model is ZW1.5-1.6/24. Sequence of the accident: At 3 a.m. on September 9, 2013, while the device was being used to unload liquefied gas from a transport vehicle, the operator heard a leaking sound coming from the compressor; upon inspection, it was found that the cylinder head on the south side of the compressor was cracked. Failure phenomenon: Around 3:00 a.m. on September 9, 2013, while the C4 compressor No. 5 at the liquefied gas station was in use for unloading, all the bolts connecting the second and third sections of the cylinder body broke, resulting in the separation of the upper and lower parts of the cylinder. 1. The bolts that connect the valve seat of the intake valve to the valve body came loose, resulting in damage to the valve disc and spring. 2. After the valve was damaged, the valve seat fell into the top part of the cylinder; given that the gap between the piston’s top surface and the cylinder head’s surface is 1.5 mm, and the thickness of the valve seat is 4–5 mm, the collision between the piston and the valve seat caused the bolts connecting the cylinder head to break.
I’m not familiar with the process. 1. What is the medium used in the production of this compressor? 2. If the medium is a gas, is it moisture-containing? 3. Judging from the footage, the jacking cylinder is the apparent cause of the accident. What is causing this, and is it related to liquid in the cylinder? 4. During disassembly, check whether the rod lock nut is loose, which may cause an increase in the structural length For reference only.
1. This compressor is used for loading and unloading liquefied gas. 2. There is a possibility of liquid presence. 3. I give you a thumbs up. 4. It is possible
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Such things are purely operational issues.
The occurrence of this accident was indeed due to an operational issue. The cause of any problem ultimately lies in management issues, and the solutions to those problems also ultimately revolve around management.