Ductile iron manhole covers come in a variety of specifications, models and sizes. Here is a detailed introduction:

• Square ductile iron manhole covers:
  Common specifications: generally 600mm×600mm, 700mm×700mm, 800mm×800mm, etc.
• Common thickness: usually 60mm, 70mm, 80mm, etc.
• Applicable scenarios: commonly used in urban roads, sidewalks, squares and other places. Its design structure is simple, easy to install, and can adapt to various road environments.

Circular ductile iron manhole covers:

• Common specifications: usually 600mm, 700mm, 800mm, etc.
• Common thickness: generally 60mm, 70mm, 80mm, etc.
• Applicable scenarios: commonly used in municipal drainage systems, sewers, rainwater wells and other places. It has good sealing performance and bearing capacity, and is suitable for places where foreign objects need to be prevented from entering.

Heavy Ductile Iron Manhole Cover (400kN):

• Material requirements: The material must be cast iron, and only cast iron can achieve the required strength.
• Carrying capacity: The manhole cover test load is 400kN, and the factory inspection allows a pressure of 360kN or a super-class 20 main vehicle.
• Applicable scenarios: Generally used in places with heavy loads, such as urban trunk roads, highways, expressways and other areas.

General Ductile Iron Manhole Cover (250kN):

• Carrying capacity: refers to the manhole cover load of 25 tons. For example, the sewage manhole cover uses the C250 type according to the traffic volume and carries 250kN (kilonewtons).
• Installation location: Installed at the roadside ditch, 0.5 meters from the roadside red line into the carriageway and 0.2 meters into the sidewalk.
• Applicable scenarios: Ordinary light ductile iron manhole covers are used in places where only light vehicles pass, such as sidewalks, township third-level roads, etc.

Light Ductile Iron Manhole Cover (125kN):

• Bearing capacity: refers to the allowable pressure of 125 kilonewtons.
• Product features: Ductile iron is used for production and processing, which is more wear-resistant and durable than ordinary products. Light inspection manhole covers should be no less than 30mm, and the height of the manhole seat should not be less than 50mm. It should be noted that the height of the manhole seat refers to the distance from the bottom of the manhole cover to the ground.
• Applicable scenarios: Suitable for areas with low bearing requirements, such as green belts, sidewalks and other areas where motor vehicles are prohibited from entering.

In addition, there are some special specifications of ductile iron manhole covers, such as composite ductile iron manhole covers, which are manhole cover products that combine ductile iron and other materials. Common combinations include ductile iron and concrete, ductile iron and plastic, etc., with various specifications and models, which can be customized according to specific needs. At the same time, it can also be customized according to the special needs of customers. Customized ductile iron manhole covers can be designed and produced according to specific requirements such as size, shape, material, etc., suitable for some special places and special needs, and can meet the personalized needs of customers.