Chapter 11 - Pipeline valves

Abstract

Pipeline valves are normally large in size and high-pressure class valves with actuators which are installed on oil or gas export pipelines. The benefits of these valves, especially the possibility of online maintenance without shutting the plant, have been explained in this chapter. Different approaches to save weight, space, and cost for these valves such as wall thickness calculation and load analysis based on ASME Sec. VIII Div.02 are included. A separate subchapter is allocated to welding and material selection of these valves. The welding of these valves to the pipe is challenging due to having different material than the pipe in offshore industry as well as wall thickness difference between the pipe and the valve. Different design considerations like body and bonnet, stem, seats, and DIB configuration have been explained. Additionally, testing, lifting, packing, and preservation of these valves are briefly explained in this chapter.