Comparison analysis of premium connection 's seal structure

Key words:  contact pressure  contact length  seal structure  finite element method  physical test

Abstract:

The premium connection 's seal structure of the casing is the key factor affecting the performance of sealing. The changes of contact length, contact pressure and penetration length along the primary sealing surface of two different main seal structure forms (the cone/cone and arc/cone) were analyzed by finite element method at make up, tension, bending, internal pressure and tensile loading. The changing laws of different types of sealing surface with load capacity were given. The new seal principles were put forward. When the effective contact length of sealing contact surface exceeded 0.5 mm, the value of contact pressure minimum subtracted from maximum was 5.8 times internal pressure, and in range of effective contact pressure and length, contact surface plastic strain was controlled in the yield point 's scope of strain, anti galling and eliminating seal clearance were made. The test results agree well with the numerical simulation.The results show that the established model was proper and the used method was reasonable. The influence of the tensile load on the seal was significantly higher than bending load.