With many years of experience in the research and development of fire extinguisher cylinders, Zhongwen is able to produce a variety of high-quality cylinders that meet customer needs.

 

Fire extinguisher bottles and fire extinguishing agents generally have a service life, especially fire extinguisher bottles. Our country has relevant mandatory scrapping period regulations, but there are many types of fire extinguishers on the market. Different types of fire extinguishers have different mandatory scrapping periods, as follows. 

 

1. If it is a carbon dioxide fire extinguisher, the general service life of the cylinder is 12 years. As long as it exceeds 12 years, it must be scrapped. As long as the carbon dioxide fire extinguisher has been out of the factory for more than five years, and after the first maintenance, it must be sent to a professional maintenance unit for re-inspection every two years. 

 

2. If it is a dry powder fire extinguisher or a clean gas fire extinguisher, the cylinder generally has a service life of 10 years and must be scrapped after 10 years. As long as it is a dry powder fire extinguisher or a clean gas fire extinguisher that has been out of the factory for more than five years, it must be sent to a professional maintenance unit for re-inspection every two years after the first maintenance. 

 

3. If it is a water-based fire extinguisher, the general service life of the cylinder is 6 years, and it must be scrapped after 6 years. Three years after leaving the factory, water-based fire extinguishers must generally be sent to a professional maintenance unit for re-inspection every other year. 

 

4. If the fire extinguisher bottle is severely deformed, corroded, rusted, etc., or does not have the name of the manufacturer, actual production date, or the manufacturer has not obtained a production license, it is generally prohibited to use and repair it, and must apply for scrapping.

 

From the material point of view, the main ones are: aluminum alloy, stainless steel and carbon steel. 

 

1. Cylinders are made of low carbon steel plates of different thicknesses according to different specifications. Cylinders with welded seams can only be used for fire extinguishers with working pressures below 2.5Mpa. 

 

2. GB18248 seamless steel pipe is used for gas cylinders, and GB5099-94 seamless steel cylinders. The cylinder body is made of chromium-molybdenum steel: 35CrMo/34CrMo4, which complies with the GB18248 standard. Its chemical composition and mechanical properties after heat treatment comply with the GB4351.2-2005 and GB5099-94 standards.

 

The external color of the fire extinguisher barrel is recommended, but not mandatory, as long as it is eye-catching enough so that it can be found immediately in an emergency.

 

1. The barrel of fire extinguisher can be manufactured by welding, stretching or spinning process. 

 

2. The outer surface of the fire extinguisher barrel should be anti-corrosion treated, and a salt spray corrosion test on the outer surface should be carried out in accordance with the method 6.8.1. The test should not affect the operation and strength of the fire extinguisher. 

 

3. The inner surface of the complete set of fire extinguisher barrels should be resistant to corrosion by fire extinguishing agents, and a corrosion test must be conducted in accordance with the method specified in 6.8.2. After the test, the inner surface of the fire extinguisher must not have rust or rust spots, and the coating must not have defects such as cracking, blistering, and peeling that are visible to the naked eye.

 

When using the fire extinguisher, pull out the safety pin and press the operating lever. The operating lever pushes the drive lever, which presses down on the spring-loaded valve, opening the passage to the nozzle. The drive rod has a pointed tip at the bottom that can pierce the cylinder release valve.

 

Fire extinguishers contain different chemicals depending on their purpose. Dry powder, CO2 gas, water-based foam.

 

Yes, typically, a fire extinguisher consists of a hand-held cylindrical pressure container that contains a fire extinguishing agent that is sprayed to extinguish the fire. Although there are fire extinguishers using non-cylindrical pressure vessels, they are less common.

 

It all starts with the steel, which arrives at the factory in large coils. Each roll of steel is stretched on a stretch cutting machine, and with the help of advanced electronic equipment, it is cut into plates of exactly the same size with precision and power. 

 

After the steel coil is completely cut, each plate is rolled into a circular cylinder through a roller press. The computer again ensures the required precision, ensuring that each panel is rolled to shape with just the right amount of pressure. 

 

A fully automatic welding machine performs longitudinal welding on the cylindrical barrel, and controls the welding quality through special software. Depending on the type of fire extinguisher, a mounting bracket will also be welded to facilitate the fixing of the fire extinguisher on the wall or other locations. The top cover, base and threaded ring are then welded to each cylinder, and the entire process is fully automated. 

 

At this time, the product has the common appearance of a fire extinguisher. In order to test its compression resistance, several cylinders are taken from each batch of products and the pressure value required to cause them to rupture is tested. The test uses water pressure: first flatten the cylinder and then expand it through water pressure. If the test is normal, the longitudinal weld remains intact, and the cylinder only cracks next to the weld, which indicates that the material strength of the cylinder is insufficient, but the quality of the longitudinal weld is acceptable. In any case, the fire extinguisher failed this test. 

 

All fire extinguishers are required to withstand an air pressure test of 1.5 times the rated working pressure. The equipment checks whether the pressure remains stable within the specified time. After passing the test, the fire extinguisher will be marked with the batch number, production date and Dutch national certification mark to achieve full product traceability. This certification indicates that the product is suitable for the corresponding fire categories (A, B, C, D, F), such as liquid fires, gas fires, etc. 

 

This process is for spraying coatings on the fire extinguisher. Foam fire extinguishers and water-based fire extinguishers require inner wall coating, but dry powder fire extinguishers do not need this step. The inner wall coating can prevent corrosion of the cylinder, and the robot automatically completes the inner wall spraying and connects various process links. The robot grabs the fire extinguisher and shakes it thoroughly to ensure the coating is evenly distributed before placing it in place. 

 

The fire extinguisher sprays the iconic red coating in the powder coating room, which is the legal standard color. Fire hose reels can be used in other colors, and the hose reel cabinets can also be painted in any color according to customer needs. A major feature of this spraying system is that 90% of the sprayed powder can be automatically recycled. 

 

After the coating process is completed, the fire extinguisher can be filled with dry powder, foam, water or carbon dioxide fire extinguishing agent. 

 

In this step, all parts such as spray guns and pressure gauges are assembled, and some processes are manual operations. The sealing cap is mechanically tightened to ensure accurate and moderate torque. 

 

In order to check whether the fire extinguisher seal is qualified, a helium test is required. Fill the fire extinguisher with nitrogen and add 3% helium. Nitrogen molecules are heavier and leak slowly, while helium leaks easily. In the unlikely event that a helium leak is detected, the fire extinguisher will be scrapped.