As a key connecting component in pipeline systems, angle steel flanges are widely used in ventilation, air - conditioning, smoke exhaust, and industrial pipelines. Its structural design takes into account both strength and sealing performance, making it an important component to ensure the stable operation of the system. The following is a detailed analysis from the aspects of application scenarios, specification parameters, manufacturing processes, installation specifications, advantages, and disadvantages.

 

 I. Core Application Scenarios

1. Ventilation System: Angle steel flanges are commonly used in the ventilation ducts of factory workshops, commercial buildings, and residential buildings to ensure efficient air circulation.

2. Air - conditioning System: The central air - conditioning pipelines are connected by flanges to avoid air leakage and maintain airflow stability.

3. Smoke Exhaust System: The smoke exhaust ducts in kitchens, restaurants, and other places rely on the high sealing performance of flanges to effectively prevent the leakage of oil fume.

4. Industrial Pipelines: The gas or liquid transmission pipelines in industries such as chemical and energy need to withstand high pressure, and angle steel flanges can meet the strength requirements.

 

 II. Specification Parameter Standards

The specifications of angle steel flanges should be selected according to the actual working conditions:

- Angle Steel Model: Commonly used are No. 3 and No. 4 angle steels, corresponding to different bearing capacities.

- Flange Thickness: Thickness specifications such as 2.0mm and 2.5mm directly affect the compression performance.

- Flange Diameter: The circular diameter ranges from φ250 to φ2000, and the square can reach from 200×200 to 5000×5000, suitable for various pipeline sizes.

 

 III. Key Points of Manufacturing Process

1. Material Cutting: Cut the angle steel and plates according to the design drawings to ensure dimensional accuracy.

2. Welding and Forming: Use arc welding or gas - shielded welding. The welds should be full without slag inclusions, and bolt holes should be reserved at the four corners of the flange.

3. Surface Treatment: Grind and polish the welds. The flange height of the air duct should be ≥6mm to ensure a tight fit with the flange.

4. Quality Inspection: The flatness of the flange, the hole - spacing error (≤150mm), and the interchangeability of the bolts should meet the specifications.

 

 IV. Installation Specifications and Sealing Requirements

1. Positioning and Alignment: The flange and the pipeline interface should be fully aligned to avoid deformation caused by uneven stress.

2. Bolt Tightening: Use bolts of the same material with the same direction and length, and fix the four corners first. The bolt hole spacing in the smoke prevention and exhaust system should be ≤100mm.

3. Sealing Treatment: The gasket must be a non - combustible material (Class A) with a thickness of ≥3mm. It is strictly prohibited to protrude into the pipe or be exposed. Sealant should be applied to the four corners of the rectangular flange to prevent air leakage.

 

 V. Analysis of Advantages and Limitations

Advantages:

- High - strength Structure: Angle steel flanges can withstand high - pressure environments and are more stable than thin - steel plate flanges.

- Excellent Sealing Performance: With compliant gaskets and bolt spacing, the leakage risk is extremely low.

- Strong Durability: Galvanized rivets and anti - rust treatment extend the service life, making them suitable for corrosive environments.

 

Limitations:

- Higher Cost: The material and labor costs are higher than those of common - plate flanges, and projects with limited budgets need to make a trade - off.

- Installation Complexity: A professional construction team is required, and the process takes a long time, which affects the project progress.

 

 VI. Industry Standards and Quality Control

The production and installation of angle steel flanges need to follow specifications such as the "Technical Standard for Building Smoke Prevention and Exhaust Systems" and the "Technical Specification for Ventilation Ducts". The key control items include:

- The flatness of the air - duct flange and the firmness of riveting;

- The accuracy and interchangeability of bolt holes;

- The fire - resistance rating and installation compliance of gaskets in the smoke prevention and exhaust system.

 

Through standardized processes and strict construction management, angle steel flanges can significantly improve the safety and reliability of pipeline systems, making them an ideal choice for high - requirement engineering scenarios.