gasket stress is more than 9 mpa

　　After gasket stress is more than 9 mpa, will not leak. But because the gasket will occur under high temperature creep, compression is more and more big, the amount of springback ability worse and worse. When creep variable is small, but if the gasket stress is greater than the mP, gaskets should not leak, the hydraulic flange without hot tight; But when the worm variables is larger, the gasket stress may be less than mP, gasket leakage will happen at this time, need to consider the hot tight. Operating conditions of bolt stress distribution along the length direction of the inner stress distribution, stress distribution along the length direction plate flange lateral. In length to 0, and 100 mm respectively stud two points, the inside of the cross section at the top and bottom section length of 0 and 100 mm respectively stud section at the top and bottom section of the lateral of the two points. Blind flange on the maximum stress occurs in the nut and the upper and lower flange near the contact position, less stress on both ends.

　　Contrast is bolt due to bending moments, the inner tension and the lateral pressure, the pre-tightening force and bending moment under the joint action of the medial tensile stress is larger, the lateral smaller. After add internal pressure butt welding flange bolt stress distribution in whole with a preloaded consistent, but the stress increase. Flat welding flange on both ends of the stress increased obviously after heating, other position slightly increased.

　　We have adopted advanced production equipment and technologies to manufacture our line pipe and fluid pipe, which can not only improve product quality, but also save raw materials. Our products have high strength, good toughness and resistance to corrosion.