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For decades, the American National Standards Institute ANSI flange design for the oil and gas industry provides a seal applied technology, and effective. However, due to the demand for oil and natural gas industry have changed, ANSI flange continuously exposed shortcomings. The principle of cost-effectiveness, environmental protection and the best guarantee of health and safety operations in the 21st century and contractors are facing three major issues, so people began to consider a new method of sealing flange.
ANSI flange sealing principle is extremely simple: the two bolts each other extrusion flange sealing surface and form a seal gasket. But at the same time lead to seal damage. In order to maintain the seal, you must maintain the tremendous force of the bolt. To this end, the bolts should be doing more. A bigger bolt nut must match the larger, which means that larger diameter bolts need to create conditions on the tight nut. As everyone knows, the greater the diameter of bolts for the flange would be bent, the only way is to increase the flange part of the wall thickness. The entire device will need a great size and weight, which in the coastal environment has become a special problem because the weight in such circumstances has always been to be the main issues of concern. Moreover, essentially, ANSI flange is an invalid seal, which need to be 50% of the bolt load for gasket extrusion, while maintaining pressure on the load for only 50%.
However, ANSI flange design of the main shortcomings is that it can not guarantee no leakage. This is less than its design: the connection is dynamic, and thermal expansion, such as fluctuations in the cycle and the load will cause the movement between the flange and affect the function of the flange, so that damaged the integrity of the flange, which eventually led to leakage.
Vector's latest development by the new flange to overcome the shortcomings of the ANSI flange. Compact flange with all the advantages: standard flange not only saves space, thereby reducing the weight and, more importantly, to ensure that there will be no leakage of joint positions. The reason why reducing the size of a compact flange, as a result of reduced diameter seals, which will reduce the sealing surface of the section. Secondly, the flange gasket sealing ring has been replaced to ensure that the sealing face of sealing surface of the match. As a result, the pressure to close the cover requires only a very small pressure. With the pressure required to reduce the size of bolts and the numbers required can be reduced accordingly. The final design of a small size and light weight (than the traditional ANSI flange weight by 70% ~ 80%) of new products.