Inspection before filling The gas cylinder must be carefully and carefully checked before filling to prevent all cylinders that do not meet the requirements and requirements from being filled, to eliminate unsafe factors, and to ensure that the cylinders are filled and used. Safety in the process. 1 Whether the gas cylinder is manufactured by the unit holding the manufacturing license, whether the gas cylinder belongs to the manufacturing unit or the product that the competent safety supervision department declares to be scrapped or stipulated or needs to be re-examined. 2 Whether the gas cylinder modification meets the requirements. 3 Whether the original mark of the gas cylinder meets the standards and regulations, and whether the printed characters are clearly visible. The contents of the gas cylinder's printed mark shall include: gas cylinder manufacturing unit name or code; gas cylinder number; hydraulic pressure; nominal working pressure; actual mass; actual volume; bottle design wall thickness; manufacturing unit inspection mark and manufacturing Years and months; supervised inspection marks; cold areas marked with gas cylinders.