Flange sealing and leakage sealing treatment are important links to ensure the safe operation of pipeline systems. The following is a detailed explanation of flange sealing and leakage sealing treatment methods:

1、 Flange sealing

Flange sealing mainly relies on the tight connection between flanges and the function of sealing gaskets. The following are several key elements to ensure flange sealing:

Selection of flange: Choose the appropriate flange material and specifications based on the pressure, temperature, and medium characteristics of the pipeline system. Stainless steel flanges have become the preferred choice in many fields due to their excellent corrosion resistance and strength.

Selection of sealing gasket: Sealing gasket is a key component of flange sealing, and its material, thickness, and shape need to be selected according to the characteristics of the medium and working pressure. Common sealing gasket materials include rubber, asbestos, polytetrafluoroethylene, etc.

Bolt tightening: The degree of bolt tightening directly affects the sealing performance of the flange. When tightening bolts, it is necessary to ensure that the bolts are evenly stressed to avoid sealing failure caused by local over tightening or over loosening.

2、 Leakage sealing treatment method

When there is a leak at the flange connection, timely measures should be taken to seal it. The following are several common methods for leak sealing treatment:

Direct twisting method: suitable for situations where the flange connection gap is less than 1mm and the medium pressure is low. Use a flat punch and a hand hammer to tightly twist the flange connection gap, forming a sealed cavity, and then inject sealant to achieve the purpose of leak prevention.

Copper wire twisting method: suitable for situations where the gap between flange connections is slightly larger but still relatively uniform. Use copper wire with a diameter equal to the flange gap, twist it into the gap with a certain overlap, use a flat punch to reduce the gap, form a new sealed cavity, and then inject sealant.

Fixture method: When the flange connection gap is large or the medium pressure is high, the fixture method can be used. Use specialized fixtures to contain leakage points, form a sealed cavity, and then inject sealant. The selection and installation of fixtures should be based on the leakage location and medium characteristics.

Replace the sealing gasket: If the leakage is caused by aging, damage, or improper selection of the sealing gasket, it is necessary to replace it with a new one in a timely manner. When replacing, it is necessary to ensure that the gasket material, specifications, and shape match the flange and medium characteristics.

Adjust bolt preload: If the leakage is caused by insufficient bolt preload, the bolt preload can be appropriately increased to ensure a tight connection between the flanges.

3、 Precautions

Safety first: When performing flange leakage sealing treatment, it is necessary to ensure the personal safety of the operators. Especially in the construction of sealing leaks of flammable and explosive media, explosion-proof tools must be used and safety operating procedures must be strictly followed.

Selection of sealant: Choose the appropriate sealant based on the temperature of the leakage system and the characteristics of the medium. The sealant should have excellent characteristics of temperature resistance, medium resistance, and injection process performance.

Fixture design: When using the fixture method for leak sealing treatment, it is necessary to ensure that the fixture design complies with the pressure vessel equipment specifications. The material, strength, and sealing performance of the fixture must meet the requirements for use.

Regular inspection: To ensure the long-term stable operation of flange connections, it is necessary to regularly inspect and maintain the flange connection parts. The inspection includes checking the tightness of bolts, the condition of sealing gaskets, and whether the flange is deformed.

In summary, flange sealing and leakage sealing treatment are important links to ensure the safe operation of pipeline systems. When choosing sealing methods and dealing with leaks, comprehensive consideration and selection should be made based on specific circumstances.

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