First, the advantages of special-shaped flange
The compact profiled flange has all the advantages: the standard profiled flange not only saves space, reduces weight, but more importantly ensures that the joint does not leak. The reduced size of the compact profiled flange is due to the reduced diameter of the seal which will reduce the cross-section of the seal face. Second, the flange gasket has been replaced by a seal ring to ensure that the seal faces the sealing surface. In this way, only a small amount of pressure is required in order to press the cover tightly. As the required pressure is reduced, the size and required number of bolts can be correspondingly reduced.
Second, the classification of shaped flanges
The structure of the profiled flange is different depending on the type of pipe fitting selected. The profiled flange is the transition piece between the tubing head and the tree.
The S-shaped profiled flange is used with the S-type and SI-type tubing hangers. The lower flange is bolted and the upper part is the wire connection. The flange can be equipped with or without liquid control line holes according to the user's requirements. The hanging is consistent. The threaded joint NPT1/2 is connected to the profiled flange.
The lower part of the T-shaped profiled flange is bolted. The upper part can be bolted or planted. The lower hole is machined with oil pipe thread. It is generally used in conjunction with the S-II type oil pipe. It can also directly suspend the oil pipe. At this time, the oil pipe head is below. WA type wound tubing should be installed.
The MH-type profiled flange is used in conjunction with the MH-type tubing. The lower part is bolted, the upper part is wire-connected, and the internal processing has special high-strength ladder threads to connect and seal the MH-type tubing.
Third, the sealing principle of the special-shaped flange:
The two sealing faces of the bolt press each other against the flange gasket and form a seal. But this also causes damage to the seal. In order to maintain the seal, it is necessary to maintain a huge bolt force. To do this, the bolts have to be made even bigger. Larger bolts are matched to larger nuts, which means that larger diameter bolts are needed to create the conditions for tightening the nuts. The larger the diameter of the bolt, the more suitable the profiled flange will become, the only way to increase the wall thickness of the flange. The entire device will require a great size and weight, which becomes a special problem in the offshore environment, because weight is always a major concern for people in this situation. The flange is an ineffective seal that requires 50% of the bolt load to be used to squeeze the gasket, while the load used to maintain the pressure is only 50%.
However, the main design disadvantage of the profiled flange is that it does not guarantee leak-free. This is the design flaw: the connection is dynamic, and cyclic loads such as thermal expansion and undulations cause movement between the flange faces, affecting the function of the flange, thereby impairing the integrity of the profiled flange and ultimately Causes a leak.
Fourth, other
Shaped flange manufacturing standards: national standard, American standard, Russian standard, Japanese standard, etc.
Shaped flange material: 304.316.316L.0Cr18Ni9.321.202, etc.
Shaped flange use: widely used in water conservancy, electric power, power stations, pipe fittings, industrial, pressure vessels, etc.
Shaped flange connection: flange nut, bolted.
Shaped flange production process: professional overall forging, forging manufacturing, etc.
Shaped flange processing: high-precision CNC lathe turning, general lathe finishing, argon arc welding, etc.
Shaped flange nominal pressure sch5s, sch10s, sch20s, sch30s, sch40s, etc.
Shaped flange production process: professional overall forging, forging manufacturing, etc.
Shaped flange processing: high-precision CNC lathe turning, general lathe finishing, argon arc welding, etc.
Shaped flange nominal pressure: ch5s, sch10s, sch20s, sch30s, sch40s, etc.
Shaped flange manufacturing standards: national standard, American standard, Russian standard, Japanese standard, etc.
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