Using ring stiffness to calculate the elastic modulus of steel-plastic composite pre-insulated pipe

Elastic modulus of the pipe mill is one of the most important figures, which decides the character of the mechanics of materials. It is usually gained by experiments or finite element analysis. Combining computing formula of ring stiffness of buried pipeline and test results of ring stiffness of new straight buried thermal pipe (steel-plastic composite pre-insulated pipe), this article uses moment of inertia and equivalent section method to calculate elastic modulus of this pipe catalogue. By comparing with practical test results, the article testifies that this method could be probably used in directly buried installation.