Asme B16.9 Sa 182 GR F304 F316 BLRF
Nthawi zina amatchedwa chimphepo chamkuntho; Gwiritsani ntchito chopanda pake pa mapaipi, mavavu, ndi mapampu, kapena ngati chophimba. Zoyenera kugwiritsa ntchito ndi dongosolo la masana 40 kapena 80 kusapanga dzimbiri, pazogwiritsa ntchito ndi mpweya, madzi, mpweya wachilengedwe, ndi nthunzi.