... thickened by a process called "upsetting" through which a pipe’s exterior surface is pushed inward. Next, the pipes are ... .4X, G, SEU , IEU41412.9519.274101.60.338.38E, X, G, SEU , IU4 1/213.7512.2518.234.5114.30 ... 88EEU , IU4 1/216.61522.324.5114.30.3378.56E, X, G, SEU , IEU4 1/22018.7127.844.5114.30. ... 4310.92E, X, G, SEU , IEU516.2514.8822.1651270.2967.52X, G, ...