Vavu ndi gawo lowongolera mumayendedwe amapaipi, omwe angagwiritsidwe ntchito kuwongolera kayendedwe ka mpweya, madzi, nthunzi, zowononga zosiyanasiyana, matope, mafuta, zitsulo zamadzimadzi ndi ma radio radio. M'makampani opanga mankhwala, kugwiritsa ntchito ma valve akuluakulu. Mwachitsanzo, mu pharmaceutical indus ...
Werengani zambiri