锅炉内压力高于额定压力需要释放能量时，安全阀不能及时弹起，锅炉就会发生意想不到的严重事故。
Boiler pressure is higher than rated pressure to release energy, the valve can not be a timely pop-up, the boiler unexpected serious incidents occur.
本文给出了位于上空腔的中小尺寸管道破裂或安全阀意外开启引起的小破口失水事故实验研究。
A simulation experiment of small break loca is introduced, which was caused by the breakdown of a small size or middle size pipe located at upper plenum, or by unexpected opening the safety valve.
万一发生堵塞，产生压力，有报警器，如果报警，工人不在或睡觉没听见，有安全阀自动减压，确保不能有事故发生。
In case of congestion, there will be pressure that arouses alarm, if no response from workers, safety valves will decompress pressure automatically. The device guarantee no accidents.
万一发生堵塞，产生压力，有报警器，如果报警，工人不在或睡觉没听见，有安全阀自动减压，确保不能有事故发生。
In case of congestion, there will be pressure that arouses alarm, if no response from workers, safety valves will decompress pressure automatically. The device guarantee no accidents.
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