What color should the manhole cover be in the national standard?

For general manhole covers, red is used for fire fighting, yellow is used for sewage, blue is used for tap water, red is used for thermal power, blue is used for reclaimed water, and green is used for reclaimed water and telecommunications. However, the color of the manhole cover is not mandatory, but the purpose must be indicated.

Performance characteristics:

1, high strength: magnesite test, with high compressive, bending and impact strength and toughness. After long-term use, the manhole cover will not be crushed and damaged, and the "urban black hole" accident can be completely eliminated.

2. Beautiful: the design of magnesite manhole cover surface is beautiful, with bright and adjustable colors, which beautifies the urban environment.

3. Easy to use and light in weight: the weight of the product is only about one third of that of cast iron, which is convenient for transportation, installation and emergency repair, and greatly reduces the labor intensity.

Extended data:

1, definition:

Well covers are used to cover deep wells in roads or homes to prevent people or objects from falling. [1] According to materials, it can be divided into metal manhole covers, high-strength fiber cement concrete manhole covers and resin manhole covers. Generally use a circle. Can be used for green belts, sidewalks, motor vehicles, docks, alleys, etc.

2. Development direction:

The research and development of stainless steel manhole cover in China and the composite manhole cover products on the market are basically carried out according to the following three technical routes.

(1) magnesite manhole cover (inorganic FRP manhole cover).

(2) Glass fiber reinforced plastic/stainless steel hand-pasted manhole cover.

(3)BMC molded plastic manhole cover.

Baidu encyclopedia-manhole cover