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Audited Supplier | Model Number | manhole cover,double triangular:AFT-DT-6060D |
| Brand Name | Arfanti |
| origin | China |
| Small Orders | Accepted |
Manhole covers are often made out of cast iron, concrete or a combination of the two. This makes them inexpensive, strong, and heavy, usually weighing more than 113 kilograms (249 lb). The weight helps to keep them in place when traffic passes over them, and makes it difficult for unauthorized people without suitable tools to remove them.
Manhole covers may also be made from glass-reinforced plastic or other composite material (especially in Europe, or where cover theft is of concern). Because of law restricting acceptable manual handling weights, Europe has seen a move towards lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and electrical insulating properties.
Other manhole shapes can be found, usually squares or rectangles. For example, in the United Kingdom nearly all manhole covers are square or rectangular and very occasionally triangular, but almost never circular. Nashua, New Hampshire, is unusual for having triangular manhole covers that point in the direction of the underlying flow. In 2011, the city began gradually phasing out the triangles,[9] which were made by a local foundry, because they were not large enough to meet modern safety standards and a manufacturer for larger triangles could not be found.[10] Some manhole covers in Hamilton, Bermuda, are triangular, and hinged. Some triangular water-main covers also exist in San Francisco
| Item | Manhole cover |
| Material | Ductile iron |
| Color | Black |
| Size | Customer's 3D Drawing |
| Logo | ARFANTI or Customized |
| Load capacity | A15,B125,C250,D400,E600 and F900 |
| Painting | Black bituman/Customer's requirement |
| Certificate | ISO9001,BS-EN124 |
| Tolerance | Machining:+/-0.02mm, finish machining:0.002mm |
The covers usually feature "pick holes", into which a hook handle tool is inserted to lift them. Pick holes can be concealed for a more watertight lid, or can allow light to shine through. A manhole pick or hook is typically used to lift them, though other tools can be used as well, including electromagnets.
Product Performance
The square ductile iron manhole cover is strong and durable, with good tensile strength and pressure resistance. Compared with resin composite and cement rainwater inlets, the elongation rate is much higher, with good pressure resistance and not easy to be damaged. At the same time, ductile iron manhole covers are generally divided into round and square. In urban road administration, round manhole covers are generally used because round manhole covers are not easy to tilt and can better protect the safety of pedestrians and vehicles. In residential areas, rural areas or on both sides of urban roads, square covers are generally used to better prevent the entry of liquids such as rainwater.
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