10,000-level clean workshop air duct flange fabrication and reinforcement
Manufacture and reinforcement of air duct flange for 10,000-level clean pharmaceutical cleanroom
This article introduces in detail the fabrication and reinforcement of the flanges of non-metallic ventilation ducts in Class 10,000 clean workshops.
1. Production of air duct flanges for 10,000-level clean workshops:
For the production of circular flanges, the length of the required polyvinyl chloride slats should be calculated according to the diameter of the air duct, and the s...
Text label: Clean workshop ventilation system installation, 10,000-level clean pharmaceutical cleanroom air duct production
Fabrication and reinforcement of air duct flange for class 10,000 clean workshop
This article introduces in detail the fabrication and reinforcement of the flanges of non-metallic ventilation ducts in Class 10,000 clean workshops.
1. Production of air duct flanges for 10,000-level clean workshops:
For the production of circular flanges, the length of the required polyvinyl chloride slats should be calculated according to the diameter of the air duct, and the shrinkage margin after heating should be added. The beveling machine is used to open the inner diameter bevel; the circular flange should be thermoformed twice, the first heating is to form a ring, the joint is welded, and the second heating is flattened on the tire to shape; there is also a production The method is to cut and blank the flange on the plastic sheet according to two or more fan-shaped plates. After the groove is made, the group is welded and formed. The flange below ϕ150 should not be hot-rolled, but can be processed by a lathe.
For the production of rectangular flanges, the plastic plate should be cut into strips, the grooves should be opened, and then assembled and welded on the plate according to the required size. Press the material to prevent plastic welding deformation and keep the surface of the flange flat. The allowable deviation of the inner diameter of the circular flange or the inner edge of the rectangular flange is +2mm, negative deviation is not allowed, and the flatness deviation should not be greater than 2mm; the spacing of the bolt holes on the flange should not be greater than 120mm. Bolt holes should be provided at the four corners of the rectangular duct flange.
The drilling of the flange can be done with an ordinary electric bench drill or a portable electric drill. In order to avoid overheating of the plastic plate at the drilling site, the drill bit should be pulled out of the hole for cooling intermittently. The screw hole should not be skewed or the surface may rotate too fast A protruding defect occurs. The flange and air duct should be welded, and the end face of the flange should be perpendicular to the axis of the air duct. When the diameter or side length of the air duct is greater than 500mm, a triangular reinforcing plate should be installed at the connection between the air duct and the flange, and the distance should not be greater than 450mm .
Second, the assembly and reinforcement of the air duct of the 10,000-level clean workshop
1. Assembly of air ducts
When the air duct is assembled and welded, the longitudinal seams should be staggered, and the staggered distance should be greater than 60mm. The two ends of the air duct should be parallel without obvious distortion; the surface should be flat, and the convex and concave should not be larger than 5mm. should be uniform. When the diameter of the circular air duct is less than 500mm and the length of the large side of the rectangular air duct is less than 400mm, the connection of the air duct can be butt welding; The connection of pipes should be connected by casing. The two ends of the casing are lap welded with the air duct. The thickness of the casing should not be less than the thickness of the air duct, and the length of the casing should be 150~250mm. The diameter of the circular air duct is less than or equal to 200mm, and the socket connection can also be used, and the socket is formed by heating expansion, and the depth should be 40~80mm.
2. Reinforcement of air ducts
Rectangular air ducts formed by welding at four corners with a side length greater than or equal to 630mm, or rectangular air ducts formed by heating and crimping with side lengths greater than or equal to 800mm, or air ducts with a pipe length greater than 1.2m, shall adopt a reinforced frame and air ducts. The reinforcement measures for pipe phase welding, the specification of reinforcement frame is the same as that of flange. The large sample 'B' is the connection method of the hard casing or the soft casing when the air duct is connected. Zhongjing Global Purification can provide supporting services such as consultation, planning, design, construction, installation and transformation of purification workshops and clean workshops.
3. Flange assembly and reinforcement
When welding the air duct and the flange, check the verticality of the center line of the air duct and the flange plane, as well as the flatness of the flange plane. The allowable deviation is the same as that of the metal air duct, and should be less than 2mm; After the air duct is welded, the solder that is higher than the flange plane should be planed by a woodworking planer. When the perimeter of the air duct is greater than or equal to 1000mm, the connection between the air duct and the outer edge of the flange should be reinforced with triangular supports. Each pipe section can be set with a pair of flanges about 3~4m, and can also be appropriately increased or decreased according to the pipe diameter, transportation conditions and on-site installation conditions.
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