Flange seal are many factors affecting flange sealing. Mainly include: bolt pre-tightening force; Sealing surface type; Gasket performance; Flange rigidity; Operating conditions. For decades, the American national standards institute design ANSI flange has for oil and gas industry provides a suitable sealing technology, and effective. But due to the demand of oil and gas industry have changed, the defects of the ANSI flange constantly exposed. Cost-benefit principle, environmental protection, and the best health and safety guarantee are operators and contractors of the 21st century faces three big subject, as a result, people began to consider new flange sealing method. ANSI flange sealing principle is simple: the two bolt sealing surface compressive flange gasket with each other and form a seal. But it also causes the destruction of seal. In order to keep the seal, will have to maintain large bolt force. For this purpose, the bolt will be bigger. And a bigger bolt will match the bigger nut, which means the larger diameter bolts to create conditions to tighten the nut. Little imagine, the diameter of the bolt, the greater the applicable flange will become bent, the only way is to increase the flange part of the wall thickness. The whole device will requires a great deal of the size and weight, this in the offshore environment has become a special problem, because in this case the weight of people must concern has always been the main problem. And, ultimately, ANSI flange is an invalid sealing, it needs to be 50% of the bolt load for dummy blocks, and used to keep the pressure load is only 50%. However, ANSI flange of main design drawback is that it does not guarantee no leakage. This is insufficient on its design: the connection is dynamic, and such as thermal expansion and the ups and downs of cyclic load can create the flange surface between the moving, affect the function of the flange, to destroy the integrity of the flange is damaged, eventually lead to leakage. The latest development of new type of flange by Vector company overcomes the drawback of the ANSI flange. Compact flange possesses the advantages of various aspects: standard flange not only saves space, reduce the weight, more important is to ensure that the joint parts will not leak. Compact flange size is reduced, was due to the decrease of the diameter of the seal, it will reduce the sealing surface of cross section. Second, the flange gasket has been replaced by sealing ring, to ensure that the sealing face sealing surface matching. Thus, in order to close cover only need a small pressure. With the reduction of the pressure required the size of the bolt and the required quantity can be reduced accordingly. The final design out a small volume and light weight ( Than traditional ANSI flange of 70% ~ 80%) reduction in weight The new product. A flange leak sealing treatment method. Leak and condition 6 Industrial Valves leakage of the flange bolts on both sides, because the flange clearance, can't be eliminated by injecting sealant clearance leakage. Leakage medium for steam, leakage system temperature 400 ~ 500 ℃, the system pressure of 4 mpa. two Seal construction method based on the field survey of leaking location, for the realization of the limited block, by using fixed fixture tolerance leak point form a sealed chamber, injecting sealants, to eliminate leakage. 1. Fixture design ( 1) Fixture structure to determine (1) include leak, establish the valve flange and pipe flange connection between sub flange seal chamber. To prevent make the body with pressure-out potential leak appears again with the flange clearance leakage, in the jig and the flange outer anastomotic set ring cavity note glue. (2) reducing flange agent injection process, the fixture is easy to trail flange lateral displacement, the limit of the tooth contact card is adopted tightening measures. 2. Sealant selection and dosage estimation ( 1) Sealant selection according to temperature and leak leakage system characteristics, the TXY - 18 # type A sealant. The sealant heat resistance, medium resistance and injection process performance, is easy to establish a uniform sealing structure, and sealing can maintain long-term stability. ( 2) Dosage estimation sealant 4 unilateral leak. 5公斤。 3. Construction operations ( 1) Fixture installation, due to the tooth contact, tooth tip diameter is small, need to the outer wall of circumferential tap clamp when installation gear tooth deformation, tightens limit. ( 2) Note agent operation to complete jig and body and flange ring cavity after injection sealing cavity, and then in the middle of cavity injection agent, the agent injection process to balance pressure, and pay attention to the injection pressure and prevent stress relaxation. ( 3) Sealant after curing, after effect observation, local injecting pressure, prevent stress relaxation, closed agent injection hole again.
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