1、鍋爐超壓的現象
（1）蒸汽溫度升高而蒸汽流量減少。
Steam temperature and steam flow is reduced.
（2）發出超壓報警信號,超壓聯鎖保護裝置動作使鍋爐停止送風、給煤和引風。
Issued overpressure alarm signal, overpressure protection device interlock action to stop blowing the boiler, coal and the wind.
（3）汽壓急劇上升,超過許可工作壓力,壓力表指針超紅線人安全閥動作后壓力仍在升高。
Steam pressure rises sharply over licensing work pressure, pressure gauge pointer over the red man was still elevated after pressure safety valve.
2、鍋爐超壓的原因
（1）壓力表管堵塞、凍結;壓力表超過校驗期而失效;壓力表損壞、指針指示壓力不正確,沒有反映鍋爐真正壓力。
Pressure gauge tube blockage, freezing; rather than calibration of pressure gauges fail; gauge damage, the pointer indicates the pressure is not correct, does not reflect the real pressure boiler
（2）經檢驗降壓使用的鍋爐,假如安全閥口徑沒做相應變化（鍋爐降壓使用時,安全閥口徑應增大）,使安全閥的排汽能力不足,汽壓得不到控制而超壓。
Buck used by the boiler inspection, if the valve diameter did not change accordingly (step-down using the boiler safety valve diameter should be increased), so that the exhaust valve capacity is insufficient, and the vapor pressure is not controlled overpressure.
（3）安全閥失靈;閥芯與閥座粘連,不能開啟;安全閥進口處連接有盲板;安全閥排汽能力不足。
Valve failure; valve and valve seat adhesions, can not open; safety valve inlet connected with blind; inadequate exhaust valve capacity.
（4）用汽單位忽然停止用汽,使汽壓急驟升高。
Steam unit suddenly stopped using steam, vapor pressure so abrupt increase.
（5）超壓報警器失靈,超壓聯鎖保護裝置失效。
Overpressure alarm malfunction, overpressure protection interlock device failure
（6）鍋爐職員沒有監視壓力表,當負荷降低時沒有相應減弱燃燒。
Staff did not monitor the boiler pressure gauge, when the load without a corresponding decrease to reduce combustion.
