Ceev faj rau kev nyab xeeb siv nuv

1. Covnuv should be manufactured by a formal professional factory in accordance with the technical conditions and safety specifications of the nuv, and the product should have the quality certificate of the manufacturer, otherwise it is not allowed to be used.
2. The new nuv should be subjected to a load test, and the opening of the measuring nuv should not exceed 0.25% of the original opening.
3.During use, check whether the nuv is cracked or severely deformed, corroded and worn.
4. Qhovnuvyuav tsum tau kuaj ib xyoos ib zaug. Thaum lub sijhawm ntsuas, ua qhov ntsuas zoo ib yam ntawm 1.25 npaug qhov ua haujlwm tau tso cai rau 10 feeb, thiab tshuaj xyuas nrog lub iav tsom iav lossis lwm txoj hauv kev. Yuav tsum tsis muaj kab nrib pleb, tawg thiab deformation seem.
5. Peb ntu phom sij yuav tsum tau ntxuav nrog kerosene. Siv lub iav tsom iav saib seb puas muaj kab nrib pleb. Rau phajnuvs, txheeb xyuas cov ntoo thiab cov pins rau hnav.
6. Defects on the nuv shall not be repaired.