GB/T 5310 ndi mtundu wa chubu cha boiler.

Zinthu zake zoimira ndi 20g, 20mng, 25mng. Ndi chitsulo chapakati cha kaboni chokhala ndi manganese ochepa.

Kutalika kwa chubu cha boiler kumagawidwa m'mitundu iwiri: kukula kokhazikika ndi kukula kawiri. Mtengo wa chubu chilichonse chapakhomo umawerengedwa malinga ndi kutalika komwe kwatchulidwa, ndipo mtengo wa chubu chilichonse umawerengedwa malinga ndi kulemera kwenikweni.

Ma Double Scale akhoza kugawidwa m'magulu atatu:

Chingwe cholamula chachifupi: chimagwiritsidwa ntchito kukonza chitoliro chapadera chachitsulo chopanda msoko pa chothandizira;

Chitoliro chachitsulo chosapindika chofanana ndi khoma (m'mimba mwake wakunja wochepera 32mm): chimagwiritsidwa ntchito popanga makina, zida za hydraulic zolondola kwambiri komanso kutsirizika bwino kwa chitoliro chachitsulo chosapindika cholondola;

Chitoliro chachitsulo chopanda msoko chosakhala chachizolowezi (m'mimba mwake wakunja woposa 32mm kapena m'mimba mwake wamkati wochepera 40mm): Chimagwiritsidwa ntchito pazigawo zosiyanasiyana za kapangidwe kake, zida ndi zida zamakanika.