I-GB/T 5310 iwuhlobo lweshubhu lokubhayela.

Izinto zayo ezimele ziyi-20g, 20mng, 25mng. Iyinsimbi ye-carbon emaphakathi ene-manganese encane.

Ubude bokulethwa kwe-boiler tube buhlukaniswe ngezinhlobo ezimbili: usayizi ongashintshi kanye nosayizi ophindwe kabili. Intengo yeyunithi yeshubhu ngayinye yasekhaya ibalwa ngokuvumelana nobude obubekiwe, futhi intengo yeshubhu ngayinye ibalwa ngokuvumelana nesisindo sangempela.

Isikali esiphindwe kabili singahlukaniswa sibe izinhlobo ezintathu:

Irula emfushane: isetshenziselwa ukulungisa ipayipi elikhethekile lensimbi elingenamthungo esisekelweni;

Ugqinsi olulinganayo lodonga olumise okwesipesheli ipayipi lensimbi elingenamthungo (ububanzi bangaphandle bungaphansi kuka-32mm) : lisetshenziselwe ukwakheka komshini, okokusebenza okuqhutshwa ngamanzi okunemba okuphezulu nokuqedwa kahle kwendawo yepayipi lensimbi elingenamthungo;

Ipayipi lensimbi elingenamthungo elingajwayelekile (ububanzi bangaphandle obukhulu kuno-32mm noma ububanzi bangaphakathi bungaphansi kuka-40mm) : Isetshenziselwa izingxenye ezihlukahlukene zesakhiwo, amathuluzi nezingxenye eziwumshini.