GB/T 5310 ndi mtundu wa chubu chowotchera.

Zoyimira zake ndi 20g, 20mng, 25mng. Ndi chitsulo chapakati cha carbon chokhala ndi manganese ochepa.

Kutalika kwa chubu cha boiler kumagawidwa m'mitundu iwiri: kukula kokhazikika komanso kuwirikiza kawiri. Mtengo wamtundu wa chubu chilichonse chapakhomo umawerengedwa molingana ndi kutalika kwake, ndipo mtengo wa chubu chilichonse umawerengedwa molingana ndi kulemera kwake.

Sikelo iwiri imatha kugawidwa m'mitundu itatu:

Wolamulira wamfupi: wogwiritsidwa ntchito pokonza chitoliro chachitsulo chapadera chothandizira;

Chitoliro chofanana champanda chofanana ndi chachitsulo chopanda msoko (m'mimba mwake chakunja chochepera 32mm): chimagwiritsidwa ntchito popanga makina, zida zama hydraulic zolondola kwambiri komanso kutsirizika kwabwino kwa chitoliro chachitsulo chosasunthika;

Chitoliro chachitsulo chosakhazikika chosakhazikika (m'mimba mwake wamkulu kuposa 32mm kapena m'mimba mwake osakwana 40mm): Amagwiritsidwa ntchito pazinthu zosiyanasiyana, zida ndi zida zamakina.