Ukuthola ukugqwala kwepayipi kubhekisela ekutholweni kwepayipi elingaphakathi kwepayipi ngenjongo yokuthola ukulahleka kwensimbi njengokugqwala kodonga lwamapayipi. Indlela eyisisekelo esetshenziswayo ukuze kuqondwe umonakalo wepayipi elisebenza endaweni yokusebenza nokuqinisekisa ukuthi amaphutha nomonakalo kutholwa ngaphambi kokuba kuvele izinkinga ezinkulu epayipini.

Esikhathini esidlule, indlela evamile yokuthola umonakalo wamapayipi kwakuwukuhlola ukumba noma ukuhlolwa komfutho wepayipi. Le ndlela ibiza kakhulu futhi ngokuvamile idinga ukuvala shaqa. Njengamanje, izitholi zokugqwala ezisebenzisa ubuchwepheshe bokuvuza kazibuthe kanye nobuchwepheshe be-ultrasonic zingasetshenziswa ukuthola usayizi nendawo yomonakalo njengemigodi yokugqwala, imifantu yokugqwala kwengcindezi, nemifantu yokukhathala.