Stainless steel flat welding flange

Stainless steel flat welding flange is a type of flange that is connected to pipelines through flat welding (fillet welding), and is widely used in industrial industries such as petroleum, chemical, food, pharmaceutical, and water treatment. Its material is mainly stainless steel, which has the advantages of corrosion resistance (based on actual reports), high temperature resistance (based on actual reports), good strength, and long service life, and is suitable for medium and low pressure pipeline systems.

1、 Characteristics of stainless steel flat welding flange

Simple structure and low cost

Compared with neck welding flanges, flat welding flanges have a simpler structure, save materials, and lower processing costs, making them suitable for situations with limited budgets or low sealing requirements.

Easy installation

When welding flat flanges, there is no need to weld the neck, making the construction operation simpler, especially suitable for on-site installation and maintenance.

Strong corrosion resistance (based on actual reports)

Made of stainless steel materials (such as 304, 316, etc.), it has good corrosion resistance (based on actual reports) and is suitable for transporting corrosive media (such as acid, alkali, salt solutions).

Wide applicability

Widely used in industries such as petroleum, chemical, food, pharmaceuticals, water treatment, etc., to meet the needs of different working conditions.

2、 Structure and classification of stainless steel flat welding flanges

structural style

Flange ring: the annular part connected to the pipeline.

Bolt hole: a hole used to secure flanges.

Sealing surface: The plane in contact with the gasket, usually a raised surface (RF) or a fully flat surface (FF).

classification

By material: 304 stainless steel flat welding flange, 316 stainless steel flat welding flange, etc.

According to the sealing surface form: RF flat welding flange, FF flat welding flange.

According to pressure levels: PN10, PN16, PN25, etc., corresponding to different working pressures.

3、 The application industry of stainless steel flat welding flanges

petrochemical industry

Confirm the corrosion resistance (based on actual reports) and sealing of the connection parts of the pipeline system used for transporting corrosive media such as acid, alkali, and salt solutions.

Food and Pharmaceutical

Compliant with hygiene standards, suitable for pipeline connections in industries such as food, beverage, and pharmaceuticals, to avoid medium contamination.

water treatment

Used for water treatment equipment, water supply pipelines, etc., to prevent water pollution and ensure long-term stable operation of the system.

Naval Architecture and Marine Engineering

Resistant to seawater corrosion, suitable for scenarios such as ship pipelines and offshore platforms.

4、 Key points for selecting stainless steel flat welding flanges

material selection

304 stainless steel: suitable for general corrosive media and room temperature environments.

316 stainless steel: suitable for highly corrosive media (such as seawater, chlorides) or high-temperature environments.

Pressure and temperature

Select the appropriate pressure rating and material based on the working pressure and temperature of the pipeline system.

Sealing surface form

RF (RF): Suitable for situations that require high sealing performance, used in conjunction with non-metallic gaskets.

Full Flat (FF): Suitable for low voltage, non critical connections, used in conjunction with full flat gaskets.

5、 Installation and maintenance of stainless steel flat welding flanges

Installation precautions

Before welding, the flange end face and pipeline groove need to be cleaned to confirm that there is no oil stains or rust.

Symmetrical welding is used during welding to avoid flange deformation.

Uniform force should be applied to tighten bolts to avoid leakage caused by local over tightening.

Maintenance

Regularly inspect the flange connection parts and promptly address any leaks found.

When replacing the gasket, it is necessary to clean the sealing surface and confirm that there are no impurities.

Before reusing after long-term disuse, it is necessary to check the corrosion condition of the flange.