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

First, French seal

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

Selection of flange plates: Based on the pressure, temperature and medium characteristics of the pipeline system, choose the appropriate flange plate material and specification. Stainless steel flanges have become the first choice in many fields due to their excellent corrosion resistance and strength.

Selection of sealing gaskets: Sealing gaskets are key components of flange sealing. Their material, thickness and shape should be selected based on the characteristics of the medium and the working pressure. Common materials for sealing gaskets include rubber, asbestos, polytetrafluoroethylene, etc.

Bolt tightening: The tightness of the bolts directly affects the sealing performance of the flange. When tightening the bolts, it is necessary to ensure that the bolts are evenly stressed to avoid local over-tightening or over-loosening, which may lead to seal failure.

Second, the leak sealing treatment

When leakage occurs at the flange connection, measures should be taken promptly for sealing treatment. The following are several common leakage sealing treatment methods:

Direct twist joint method: It is suitable for situations where the flange connection gap is less than 1mm and the medium pressure is relatively low. Use a flat punch and a hand hammer to tighten the flange connection gap to form a sealed cavity, and then inject the sealant to achieve the purpose of leakage prevention.

Copper wire twisting method: It is suitable for occasions where the flange connection gap is slightly large but still relatively uniform. Use copper wire with a diameter equal to the flange gap. With a certain amount of overlap left, twist it into the gap. Use a flat punch to narrow the gap to form a new sealed cavity, and then inject the sealant.

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

Replace the sealing gasket: If the leakage is caused by the aging, damage or improper selection of the sealing gasket, a new sealing gasket should be replaced in time. When replacing, it is necessary to ensure that the material, specification and shape of the gasket match the characteristics of the flange and the medium.

Adjust the 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 flange plates.

Third, matters needing attention

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

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

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

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 items include the tightness of the bolts, the condition of the sealing gasket, and whether the flange plate is deformed, etc.

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