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

 I. Flanke sealing 

 Flanged sealing mainly depends on the tight connection between the flange plates and the role of the sealing gasket. The following are some key elements to ensure the sealing of the flange: 

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

 2. Selection of sealing gasket: Sealing gasket is the key part of flange sealing. 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. 

 3. Bolt tightening: The degree of bolt tightening directly affects the sealing of the flange. When tightening the bolt, it is necessary to ensure that the bolt is evenly subjected to force to avoid partial overtightening or too looseness, causing the seal to fail. 

 II. 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 leakage sealing methods: 

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

 2. Copper wire twisting method: 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, twist it into the gap with a certain amount of connection, twist the gap with flat punch to form a new sealing cavity, and then inject sealant. 

 3. Fixture method: When the flange connection gap is large or the medium pressure is high, the fixture method can be used. Use a special fixture to accommodate the leakage point, form a sealing cavity, and then inject the sealant. The selection and installation of the fixture should be carried out according to the leakage site and the characteristics of the medium. 

 4. 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, make sure that the material, specification and shape of the gasket match the flange and medium characteristics. 

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

 III. Precautions 

 1. Safety first: When sealing flange leakage, it is necessary to ensure the personal safety of the operator. Especially in the construction of flammable and explosive media leakage sealing, it is necessary to use explosion-proof tools and strictly abide by the safety operating procedures. 

 2. Sealant selection: select the appropriate sealant according to the temperature and medium characteristics of the leakage system. The sealant should have the characteristics of excellent temperature resistance, medium resistance and injection process performance. 

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

 4. Regular inspection: In order to ensure the long-term stable operation of the flange connection, the flange connection part needs to be regularly inspected and maintained. The inspection includes the degree of bolt tightness, the condition of the sealing gasket, and whether the flange is deformed, etc. 

 In summary, flange sealing and leakage sealing are important links to ensure the safe operation of the pipeline system. When choosing the sealing method and dealing with leakage, it is necessary to consider and choose comprehensively according to the specific situation.