The American National Institute of national standards for design of ANSI flange has provided a suitable sealing technology for the oil and gas industry, for decades. And fruitful. However, the demand for oil and gas industry has changed, and the defects of the ANSI flange are often revealed. The maintenance benefit interest principle, the environment and the best guarantee of health and safety is the 21st century operators and contractors are facing three major issues. Therefore, people began to consider new flange sealing method. ANSI flange sealing principle is extremely simple: the two sealing surface of the bolt flange gasket and seal each other.
But this also leads to the destruction of the seal. In order to keep the seal, we have to maintain a huge bolt force. To do this, the bolts must be done even more. And greater bolt must match the larger nut. This means that larger diameter bolts need to create conditions for the nut is tightened. As everyone knows, the greater the diameter of the bolt, the application of the flange will become bent, the only way is to increase the flange part of the wall thickness. The whole device will require a great deal of size and weight, which is a special issue in the offshore environment, because in this case, the weight is always the main problem that people need to pay attention. And, fundamentally speaking, the ANSI flange is an invalid seal, the need to load the 50% bolts for the extrusion of the gasket, while the load is used to maintain the pressure only 50%.
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Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)
