Cause analysis of a fire accident
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In response to environmental protection efforts, the ammonia synthesis plant installed sewage pipelines in 1992, investing 2 million yuan to channel the wastewater to a sewage treatment plant for processing. The pipeline from the factory to the wastewater treatment plant is about 5,000 meters long, and it was repaired in 2005 due to blockages. During pipeline welding 1000 meters away from the factory, a flame column over 5 meters high emerged and persisted for about 10 seconds. Fortunately, no one was burned. Please analyze what caused the fire How to prevent such accidents from occurring.
The information you provided is not very accurate; could it be that the presence of some ammonia in the pipes, along with the failure to use steam for cleaning, led to the fire?
Flammable gases accumulate in the sewage pipes
What caught fire? What was the situation before starting the hot work? Flammable gas concentration? Piping preprocessing and inspection?
Wastewater systems connected to flammable and explosive production equipment also require measures such as isolation, displacement, purging, and cleaning, in addition to passing hot work analysis.
The entire pipeline contains flammable gases; you carried out work there without conducting any analysis, and the concentration of these flammable gases was above the safe level. This became a trigger, and it’s no wonder an explosion occurred
There are flammable gases, and if they are not properly managed, in places like ammonia synthesis plants, it’s a great fortune if no explosion occurs.
Before performing hot work on the sewage system, two things need to be noted: 1. Process treatment. Methods such as water topping and purging can be employed, 2. Analysis. It is particularly important to pay attention to the representativeness of the samples taken. Generally, it is required to manually saw at the location where welding will take place, and samples are collected from that site for analysis.
The pipeline installation does not meet the requirements; sewage pipes should be laid in accordance with the provisions of the \"Code for Fire Protection Design of Petrochemical Enterprises\".
With such a long pipeline, several exhaust vents should be installed.