How to Distinguish Between Heavy Duty Manhole Covers and Light Duty Manhole Covers

In the so-called heavy-duty category, the vehicles are allowed to withstand a pressure of 360kN or exceed the -20 grade main vehicle; while the light-duty category permits a pressure of 210kN or the -10 grade main vehicle.

Heavier Duty － Specialized roads and sites such as airports and highways suitable for helicopter landing and takeoff.

Heavy-duty vehicle operation, parking on urban roads, highways, and parking lots

Standard Type - Slow Lane, Residential Community Access Roads, and Entrance Lanes

Lightweight Green Zones and Vehicle-Free, Parking-Free Alleys, Roads, and Areas

Load Capacity Indicators:

Heavy-duty ≥360 1/500xd

Heavyweight ≥ 240 1/500xd

Standard Type ≥100 1/500xd

Lightweight ≥20 1/500xd

Manhole covers, used to cover road or home deep wells, are designed to prevent people or objects from falling in. They can be categorized by material into metal manhole covers, high-strength fiber cement concrete manhole covers, resin manhole covers, and so on. They are generally circular and can be used in green belts, sidewalks, motorways, docks, alleys, and more.

1. Demolding is quick, allowing for immediate detachment during the production process, enabling continuous, uninterrupted production, which is several tens of times higher than the output of other mold production.

2. Long-lasting lifespan, made of high-quality steel plate, capable of continuous use for tens of thousands of times.

3. The product boasts a clean appearance, standard dimensions, and surface patterns and text that can be easily replaced as required.

4. Due to the excellent seismic resistance of the steel molds, the products produced have enhanced compressive strength, with significantly increased load-bearing capacity.

5. User-friendly and lightweight: The product weighs about one-third of cast iron, making the cast iron manhole cover technology highly convenient for transportation, installation, and emergency repairs, significantly reducing labor intensity.

6. Anti-Theft: Resin manhole covers have no recyclable value, offering natural anti-theft protection. Equipped with locking structures to meet customer needs, they ensure the safety of property inside the well.

7. Durable Weather Resistance: The resin manhole cover, thanks to its scientific formula, advanced manufacturing process, and comprehensive technical equipment, is capable of normal operation in an environment ranging from -50℃ to +300℃.

8. Acid and alkali-resistant, corrosion-resistant, wear-resistant, and vehicle-tireable, with a long service life.

Application:

Gray iron castings are widely used in all major industrial sectors, which demand high strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shocks, tolerance for high or low temperatures, corrosion resistance, and dimensional stability. To meet the varying requirements of these conditions, there are many grades of ductile iron available, offering a wide range of mechanical and physical properties.