... ; 2)sour service models to NACE MR-01-75 The API oil hammer union can be used for cementing trucks, all ... ; Sour Service Models to NACE MR-01-75. Recommended service Manifold and line connections, suction service, and corrosion service. Features O ... -75. Recommended service Cementing, fracturing, acidizing, testing, and choke and kill lines. 10, Figure 2002 Hammer Union Nominal pipe Size:2 ...