1. The cylinder body presses the water pressure test, the unqualified must scrap, does not permit the repair welding;
2. Serious corrosion of the cylinder (large area of patent leather, rust area is greater than, equal to One-third of the total area of the cylinder) or connecting parts, the bottom of the tube is seriously corroded;
3. The inner fastener head does not have (or not installed) the gas discharging screw and the fixing screw;
4. handwheel-type valve carbon dioxide fire extinguisher, must replace the pressure valve;
5. Fire extinguisher quantity is greater than or equal to 4 Shan, should be replaced with intermittent injection mechanism of the head or add spray gun, can not be replaced should be scrapped.
6. The cylinder body is badly deformed;
7. Unreasonable structure (such as cylinder flat bottom, gas cylinder external, inlet pipe from the cylinder into the cylinder inside the dry powder fire extinguisher);
8. No factory name and factory year (including decals fall off, or although there is decals, but has not seen the factory name and factory years);
9. Manufacturers who have not obtained the production license; [3]
10. The Ministry of Public Security or the provincial (city, district) Fire Department orders prohibit sale and maintenance.