While driving, a huge explosion was heard! ! !
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While driving, the pressure in the drum rises to 102 KG; the syngas compressor operates at 3,000 revolutions per minute, at a reduced speed! Suddenly, a loud noise was heard at the site, causing panic in the control room; something had exploded there. The company’s management rushed to investigate. Based on the parameters shown in the control room, no obvious issue could be detected. Then someone reported that the HS safety valve had activated. The control room monitored the pressure in the steam drum, which had dropped to 99 KG – still no obvious problem! The system responded quickly by reducing the pressure; it was hoped that it would reset automatically. 80 KG wasn’t enough, and 60 KG also wasn’t sufficient – the managers began to worry. Fortunately, maintenance personnel managed to bring the pressure under control safely; otherwise, the entire system would have stopped working. Good things come with hard times! ! !
It’s because the work wasn’t done properly before driving. Is it due to the safety valve not having been calibrated, or is there some other reason?
The safety valve cannot return to its original position; the pressure must be reduced to allow it to reset on its own! !
If it can be confirmed with certainty that the pressure has dropped to within the normal range, why not temporarily close the control valve at the base of the safety valve to address the issue? Attempting to fix it by setting the pressure at a specific level is dangerous; moreover, continuous steam release and excessively low pressure can affect the entire system, leading to a shutdown.
The safety valve chosen for this application is quite appropriate.
In such cases, the practice in factories used to be to close the front shut-off valve while ensuring that overpressure would not occur; this usually allowed the system to return to normal, after which the front shut-off valve could be opened again. However, the safety valves that were bypassed in this way tended to leak, requiring the valve to be removed and reset at an appropriate pressure.