Spanish to English Tech/Engineering Petroleum Eng/Sci oil piping installation / removal

Once cleaning of the crude oil line is accomplished, air drill gas test hole at each tie-in point the crude oil line and air saw will make initial cold cut of the crude line at each tie-in point. I have started the translation of the paragraph but cannot get any further
Una vez concluida la limpieza de la línea de crudo, ....
your kind help shall be appreciated...