When the gas-fired hot water boiler is running, the water in the boiler can easily cause the boiler water to vaporize if it is not paid attention to during the abnormal operation and stop of the circulating pump. It may cause "air blockage" in the hot water circulation network, or it may cause burning or pipe explosion of the boiler heating surface, and in serious cases, it may cause malignant boiler explosion accidents. Therefore, vaporization of hot water boilers must be prevented.

對於燃氣熱水鍋爐內的局部產生汽化，主要是從結構設計來保證，使鍋爐的水循環可靠。而對於因突然停泵，停電或整個熱水循環係統發生問題造成熱水鍋爐憋壓汽化時，能使已產生的汽不影響熱水係統的循環和及時排出蒸汽，通常在鍋爐的頂部，器上集箱，以及熱水管道的高點設置集汽罐。

The local vaporization in the gas-fired hot water boiler is mainly guaranteed from the structural design to ensure the reliable water circulation of the boiler. When the hot water boiler is pressurized and vaporized due to sudden pump shutdown, power failure or problems in the whole hot water circulation system, the generated steam can not affect the circulation of the hot water system and discharge the steam in time. Usually, the steam collecting tank is set at the top of the boiler, the upper header of the economizer and the high point of the hot water pipeline.

當突然停泵、停電時，鍋爐鼓風，引風機停止了工作，此時，應立即打開爐門，減弱燃燒，降低爐溫，同時關閉閥門，再緩慢開啟集氣管上的排氣閥，並可向鍋爐內通入冷水，這樣，誰就會經熱水鍋爐和集氣罐排出，避免鍋水汽化。

When the pump is suddenly stopped and the power is cut off, the boiler blows and the induced draft fan stops working. At this time, the furnace door should be opened immediately to reduce the combustion and reduce the furnace temperature. At the same time, the valve should be closed, and then the exhaust valve on the gas collector can be opened slowly, and cold water can be introduced into the boiler. In this way, whoever will be discharged through the hot water boiler and gas collector to avoid boiler water vaporization.

在正常運行時，如果發現鍋爐出水溫度高於正常溫度，或發現壓力升高，可能出現了鍋水汽化、熱水循環係統受阻現象，這時也要通過集氣管進行排氣。

During normal operation, if it is found that the outlet water temperature of the boiler is higher than the normal temperature or the pressure increases, the boiler water may vaporize and the hot water circulation system may be blocked. At this time, it is also necessary to exhaust through the gas collector.