"Fire Test" Helping Family Fire Doors

The fire raged over the tiger and prevented it from happening. In addition to improving everyone's awareness of fire safety, the quality of firefighting products cannot be ignored. Recently, the Ningbo Fire Fighting Detachment conducted a fire-fighting door fire test in a special way. As a result, it found that inferior fire doors could not only play a role in fire prevention and smoke prevention, but also become “accomplice” to fire to a certain extent.

test subject

Qualified fire doors, counterfeit fire doors, ordinary wooden doors

In the outdoor open space, firefighters built a room of about 56 square meters with bricks. On the same side of the room, qualified fire doors, counterfeit fire doors, and ordinary wooden doors were installed. Firefighters then used a large amount of wood, etc. Inflammables were placed in the room and spilled with oxidizer so that the fire in the room could quickly reach the level of burning. “The results of such experiments are more persuasive because the three doors were tested in the same fire environment,” explained Wang Zhongxiang, deputy chief of the fire control technology section of the Fire Protection Supervision Division of the Ningbo Fire Brigade.

Temperature before the start of the experiment

In order to understand the temperature change of each door in real time, firefighters installed temperature detection equipment at the upper and lower ends of each door.

Pre-test temperature

Qualified fire doors: The upper and lower temperatures are 20.5 °C and 21.1 °C respectively .

Counterfeit fire doors: The upper and lower end temperatures are 21.6 °C and 20.8 °C , respectively .

Ordinary wooden doors: The upper and lower temperatures are 18.0 °C and 18.5 ° C , respectively .

At the beginning of the experiment, the firefighters ignited the flammable materials in the room from the reserved vent holes, and started timing and observing the changes of the doors, and simultaneously recorded the relevant data.

See you in 12 minutes

After the experiment began, different levels of flue gas were scattered around the door of different doors.

Ordinary wooden doors and counterfeit fire doors were burned, and qualified fire doors were always "strengthened"

After 1 minute

After the experiment began, different levels of flue gas were scattered around the door of different doors.

Excluding significant changes in the flue gas emitted from the cracks of qualified fire doors, the fumes from the remaining two doors gradually increased.

temperature

Qualified fire doors: The upper and lower end temperatures are 30.6 °C and 30.8 °C respectively .

Counterfeit fire doors: The temperature at the upper and lower ends is 29.7 °C and 29.1 °C , respectively .

Ordinary wooden doors: The upper and lower temperatures are 27.3 °C and 27.3 ° C , respectively .

After 3 minutes

Partial door panels of fire doors are scorched

There is still no obvious change in the smoke at the gaps in the qualified fire doors. The flue gas from the remaining two door gaps is getting larger and larger, and the doors of the counterfeit fire doors begin to burn.

temperature

Qualified fire doors: The upper and lower end temperatures are 43.1 °C and 43.4 °C respectively .

Counterfeit fire doors: The upper and lower end temperatures are 41.7 °C and 40.5 °C respectively .

Ordinary wooden doors: The upper and lower end temperatures are 41.1 °C and 54.2 ° C , respectively .

After 4 minutes

A large number of open flames emerge from the gaps in ordinary wooden doors

In 4 minutes and 34 seconds, the flue gas emitted from the qualified fire doors was significantly reduced, and the appearance remained unchanged. However, the part of the counterfeit fire door that had just been scorched had already been burned through, and the door of the ordinary wooden door had an open flame.

"The comparison at this time is very illustrative of the problem. No flue gas is allowed to escape from the qualified fire doors because the smoke protection bars on the fire doors have played a role after being heated up," said Wang Zhongxiang.

After 5 minutes

Partial fire door and common wooden door panel burned down

After 5 minutes, the shoddy fire door and the common wooden door panel were burned and dropped. The reporter touched the surface of each door by hand and felt that the ordinary wooden door was very hot.

temperature

Qualified fire doors: The upper and lower ends are 46.4 °C and 46.3 ° C , respectively

Counterfeit fire doors: The upper and lower end temperatures are 47 °C and 47.9 ° C , respectively .

Ordinary wooden door: The upper and lower end temperatures are 61.8 °C and 76.6 ° C , respectively .

After 6 minutes

In addition to qualified fire doors, the remaining 2 doors were completely burned

6 minutes and 07 seconds, the ordinary wooden door was completely burned through. The upper part of the door fell from the door frame, and the open flame began to roll outwards. 6 minutes 30 seconds, the majority of counterfeit fire doors were burned through, and department doors began to fall in blocks. Qualified fire doors still do not change significantly.

After 10 minutes

Burned door left only carbonized door frames

After 10 minutes, the qualified fire doors were still "strengthened" and the detection temperature was only 56.3 °C and 55.8 °C . The reporter once again touched the door surface and the door handle with his hand, and they only had a warm feeling and were not hot. In the other two doors, the door panels were basically burned and dropped. The test showed that the temperature had reached several hundred degrees.

After 12 minutes

At the end of the experiment, the temperature of the qualified fire door still changed little

Twelve minutes later, the shoddy fire door and the ordinary wooden door were completely burned, leaving only the carbonized door frame. However, the qualified fire door still did not change, and the experiment ended.

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