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What is a waterproof belt? How long is the service life?

Update:18-09-2020
Summary:

Fire hose is a hose used to transport flame-retardant l […]

Fire hose is a hose used to transport flame-retardant liquids such as high-pressure water or foam. The traditional fire hose is lined with rubber, and the outer surface is wrapped with flax braid. Advanced fire hoses are made of polymer materials such as polyurethane. There are metal joints on both ends of the fire hose. You can connect another hose to extend the distance or connect a nozzle to increase the liquid spray pressure.
Fire hoses need to be inspected once a year, and the service life is 5 years (that is, even if they are not used once, they must be replaced after 5 years), because fire hoses that have been used once can basically be scrapped.

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