... service 3.Strong, simple construction 4.Compact body saves space Spherical blowout preventers (API 16A series) Working path ( mm ) 180,230,280,346,426 ... oil, natural gas, water, drilling fluid Detailed description *Spherical blowout preventers are compact, annular type BOPS which seal reliably on ... wells without drilling tool, can fully closed wellhead. Spherical Blowout Preventers (API 16A series)