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Fluid transfer valves are used in petroleum installations worldwide such as subsea and surface operations. Gate valves utilize a sliding closure where a control member called a gate slides across a general passageway in order to control fluid flow. Gate valves are used when a straight-line flow of fluid and minimum restriction is desired. Cooper Cameron Singapore Pte Ltd is an industry leader in the design, manufacture and installation of large-bore gate valves for subsea and surface applications. The company encounters certain issues regarding the manufacture and production of their gate valves and block valves. They require a program to evaluate code compliance and act as a design tool for their block valves based on finite element analysis. Hence, Cooper Cameron has tied up with the author in a project to come up with new parametric software. The project aimed to design a program that interfaces with ANSYS and allows a user not trained in finite element modeling to carry out such analysis. Two block valve configurations were analyzed and parametric studies carried out to study the effects of temperature, pressure and wall thickness on the stresses in the block valve. Generally, when the internal temperatures and pressures of the bores increase, the Von Mises stress would increase. However, there are exceptions to this trend when the compressive stresses on the bores caused by internal pressure cancel out part of the thermal stresses. A consistent observation was made that when wall thickness between bores or between a seat and a bore decreases, the Von Mises stress increase. In addition, an investigation was carried out on the possibility of cracking on Cameron As-clad valves if no machining was done to smoothen the weld clads. Results show that the interface between the weld beads do not propagate as cracks into the wall thickness of the valves. Manufacturing cost and time will be greatly reduced since this machining process is not required. ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library

Deformation and stress analysis of gate valves