Asme B16.9 ndi muyezo wodziwika bwino m'makampaniwo kuti azigwiritsa ntchito moyenera, zopondera, ndi zigwa zomwe zimagwiritsidwa ntchito pamapaipi. Zogwirizana za kukula kwazithunzizi, kulolera, zida, ndi zolemba zamitundu yosiyanasiyana ya zinthu. Katundu wina wogwiritsidwa ntchito kwambiri ndi chipongwe, ndipo a234 wpb nthawi yayitali a rabius carbon chitsulo ndi chisankho chotchuka.