The critical temperature, saturated vapor pressure and other physical characteristics of gas fire extinguishing agent determine its pressurized storage mode, which is closely related to design and application!

按加壓貯存方式分類，氣體滅火可分為：自壓式氣體滅火系統、內貯壓式氣體滅火系統、外貯壓式氣體滅火系統。

According to the classification of pressurized storage mode, gas fire extinguishing can be divided into: self pressure gas fire extinguishing system, internal pressure storage gas fire extinguishing system and external pressure storage gas fire extinguishing system.

一、自壓式氣體滅火系統：

1、 Self pressure gas fire extinguishing system:

自壓式氣體滅火系統是指滅火劑瓶組中的滅火劑依靠自身壓力進行輸送的滅火系統。

Self pressure gas fire extinguishing system refers to the fire extinguishing system in which the fire extinguishing agent in the fire extinguishing agent bottle group is transported by its own pressure.

以下兩種情況，一般都采用自壓式氣體滅火系統：

Self pressure gas fire extinguishing system is generally used in the following two cases:

1、使用溫度高于臨界溫度的滅火劑，這類滅火劑在使用溫度范圍內永遠不可能被液化，都是采用高壓貯存，可以依靠自身壓力完成滅火劑輸送，屬自壓式氣體滅火系統。

1. Fire extinguishing agents with a temperature higher than the critical temperature can never be liquefied within the service temperature range. They are stored under high pressure and can complete the transmission of fire extinguishing agents by relying on their own pressure. They are self pressurized gas fire extinguishing systems.

示例：1G541主要組份以及G541、IG55、IG100、IG01等的臨界溫度都遠低于使用溫度，屬于自壓式氣體滅火系統。

Example: the critical temperatures of main components of 1G541 and g541, ig55, IG100, IG01, etc. are far lower than the service temperature, which belongs to self pressure gas fire extinguishing system.

（IG541、IG55、IG100、IG01均為氣態貯存）

(IG541, ig55, IG100 and IG01 are stored in gaseous state)

2、使用溫度低于臨界溫度，但飽和蒸氣壓較高的滅火劑，可以依靠自身壓力完成滅火劑輸送，也可以采用自壓式氣體滅火系統。

2. The fire extinguishing agent with temperature lower than the critical temperature but high saturated vapor pressure can be transported by self pressure, or self pressure gas fire extinguishing system can be used.

示例：二氧化碳的臨界溫度31.26℃，20℃時的飽和蒸氣壓5.7MPa，屬于自壓式氣體滅火系統。

Example: the critical temperature of carbon dioxide is 31.26 ℃, and the saturated vapor pressure at 20 ℃ is 5.7mpa. It belongs to self pressure gas fire extinguishing system.

二、內貯壓式氣體滅火系統：

2、 Internal pressure storage gas fire extinguishing system:

內貯壓式氣體滅火系統的滅火劑在瓶組內用惰性氣體進行加壓貯存，系統動作時滅火劑依靠瓶組內的加壓氣體進行輸送。

The fire extinguishing agent of the internal pressure storage gas fire extinguishing system is pressurized and stored with inert gas in the bottle group. When the system operates, the fire extinguishing agent is transported by the pressurized gas in the bottle group.

在使用溫度范圍內，飽和蒸氣壓較低的滅火劑，必須依靠惰性氣體（氮氣）增壓，依靠高壓氮氣完成滅火劑輸送。

Within the service temperature range, the fire extinguishing agent with low saturated vapor pressure must be pressurized by inert gas (nitrogen) and transported by high-pressure nitrogen.

示例：七氟丙烷在20℃時的飽和蒸氣壓為0.39MPa，必須依靠氮氣增壓才能有效釋放，一般采用內貯壓方式。

Example: the saturated vapor pressure of heptafluoropropane at 20 ℃ is 0.39mpa, which can be effectively released only by nitrogen pressurization. Generally, the internal pressure storage method is adopted.

三、外貯壓式氣體滅火系統：

3、 External pressure storage gas fire extinguishing system:

外貯壓式氣體滅火系統是指驅動氣體（氮氣）與滅火劑分別儲存的滅火系統。

External pressure storage gas fire extinguishing system refers to the fire extinguishing system in which the driving gas (nitrogen) and fire extinguishing agent are stored separately.

示例：七氟丙烷一般采用內貯壓方式，也可以采用外貯壓方式。

Example: heptafluoropropane generally adopts internal pressure storage or external pressure storage.

在外貯壓式的七氟丙烷系統中，高壓氮氣貯存在動力瓶組中；七氟丙烷藥劑貯存在藥劑瓶組中。當系統啟動時，動力瓶組中的高壓氮氣經減壓閥釋放藥劑瓶組，推動七氟丙烷滅火劑釋放防護區。

In the external pressure storage heptafluoropropane system, high-pressure nitrogen is stored in the power bottle group; Heptafluoropropane is stored in the reagent bottle group. When the system is started, the high-pressure nitrogen in the power bottle group is released to the reagent bottle group through the pressure reducing valve to promote the release of heptafluoropropane fire extinguishing agent to the protection area.

小貼士：

Tips:

1、臨界溫度：能夠使物質由氣相變為液相的高溫度叫臨界溫度。每種物質都有一個特定的溫度，在這個溫度以上，無論怎樣增大壓強，氣態物質不會液化，這個溫度就是臨界溫度。

1. Critical temperature: the maximum temperature that can make the material change from gas to liquid phase is called critical temperature. Each substance has a specific temperature. Above this temperature, no matter how the pressure is increased, the gaseous substance will not liquefy. This temperature is the critical temperature.

2、飽和蒸氣壓：在密閉條件中，在一定溫度下，與液體或固體處于相平衡的蒸氣所具有的壓力稱為飽和蒸氣壓。同一物質在不同溫度下有不同的蒸氣壓，并隨著溫度的升高而增大。

2. Saturated vapor pressure: in closed conditions, the pressure of vapor in equilibrium with liquid or solid at a certain temperature is called saturated vapor pressure. The same substance has different vapor pressure at different temperatures and increases with the increase of temperature.

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