Take the common dry powder fire extinguisher as an example. A new fire extinguisher does not need to replace the fire extinguishing agent in the cylinder within five years from the date of delivery. After the expiration of the five years, the agent can be replaced for the first time, and then the agent is replaced every two years. One fire extinguisher The service life of the fire extinguisher is ten years, and the fire extinguisher will be reimbursed after ten years.
As for daily testing, I have already explained the problem of chemicals, and then there is the problem of the pressure of the fire extinguisher. The fire extinguisher is actually a pressure vessel. To ensure its normal use, the pressure must reach the standard.
Usually, check the pressure gauge on the fire extinguisher more often. When the pointer on the pressure gauge points to the green area, it means the pressure is normal and can be used; when the pointer points to the yellow area, it means that the pressure exceeds the standard and it is dangerous to use; when the pressure points to the red area , indicating that the pressure is insufficient, the fire extinguishing agent in the cylinder cannot be pressed out or the spraying distance is not enough. If the problem is found at any time, it is necessary to go to the maintenance point to pressurize it at any time.
Pressure does not affect the quality of the fire extinguishing agent.
As for water-based fire extinguishers and gas fire extinguishers, their agents will not expire. This is common sense of physics and does not need to be explained.
Usually placed and maintained in place is basically no problem. Besides, dry powder fire extinguishers should be placed in a suitable location, not exposed to wind, sun and rain, or placed in humid and high temperature places. The agent is easy to agglomerate in humid places, and high temperature places may also cause the cylinder to burst. After all, it is pressure vessel.