... for primary seal; Butt-weld available. 5, Figure 600 Hammer Union Nominal pipe Size:1, 2, 3, 4; Pressure Rating:6000psi cwp ... : pipeline thread, tubing thread, butt-weld; 8, Figure 1003 Hammer Union Nominal pipe Size:2, 3, 4,5; Pressure Rating: 2 to ... , testing, and choke and kill lines. 10, Figure 2002 Hammer Union Nominal pipe Size:2, 3; Pressure Rating: 20000psi cold working pressure ...