Can't air ducts over 2 meters share flanges? Can the smoke exhaust system use ordinary flange duct?

The smoke exhaust duct belongs to the high-pressure system, and the * * plate flange can only be used for the air duct of the medium and low-pressure system, and the large side is not more than 2000 mm Therefore, the * * plate flange cannot be used for the smoke exhaust duct, and the * * plate connection cannot be connected with the flange, so it cannot be used for the fire smoke control and extraction system.

In GB50243-2002

Article 4.2.6 The connection of metal air ducts shall meet the following requirements:

1, the bite seams of air duct plate splicing should be staggered, and there can be no cross-shaped flat-fell seam.

2. The material specification of metal air duct flange shall not be lower than that in Table 4.2.6- 1 or Table 4.2.6-2. The hole spacing between the flange bolts and rivet holes of the air duct in the medium and low pressure system should not be greater than150 mm; ; The air duct of high pressure system should not be greater than100 mm.

The four corners of the rectangular pipeline flange should be provided with screw holes. When the reinforcement method is used to improve the strength of air duct flange, the corresponding use conditions of flange material specifications can be relaxed appropriately.

Extended data:

* * * Plate flange manufacturing:

The standard straight pipe is directly pressed into the conjoined flange through the assembly line. Non-standard straight pipes, elbows, tees, crosses and pipe fittings after blanking. The forming of TDF flange is completed on a single machine. Flange corners are directly stamped and formed by die, and can be pasted at four corners during installation. The connection between flanges is made of Falanca and galvanized steel plate, which is shaped by Falanca molding machine and cut into uniform size for installation and connection.

TDF*** plate flange and pipeline steel plate are integrated, so it is not necessary to rivet like angle steel flange. The two pipes are connected by special Falanca, and the four corners are connected by 90-degree flange angles, and then fixed by bolts. Simple operation, high efficiency, smooth appearance, accurate size, strong interchangeability and stable product quality.

References:

Baidu Encyclopedia-* * Plate Flanged Duct

References:

Baidu encyclopedia-pipeline