Manhole cover sizes and load classes
Manhole Cover Sizes and Load Classes
Manhole covers are essential components of drainage systems, providing access for maintenance while ensuring safety. Understanding the different sizes and load classes of manhole covers is crucial for selecting the appropriate type for specific applications.
Manhole Cover Sizes
Manhole covers come in various sizes to fit different openings, typically measured in milimeters. Standard sizes include:
| Manhole Size | Usage Case |
|---|---|
| 300mm x 300mm | Smaller access chambers |
| 450mm x 450mm | Residential access chambers |
| 600mm x 600mm | General utility access chambers |
| 900mm x 900mm | Large utility/industrial access chambers |
Choosing the correct size ensures proper fit and functionality, preventing debris from entering the drainage system and providing safe access for maintenance workers.
Load Classes
Manhole covers are categorised by load classes, indicating the maximum weight they can withstand. The European standard, BS EN 124, defines several load classes:
| Load Class | Max. Weight Capacity | Usage |
|---|---|---|
| A15 | 1.5kN / 1.5 tonnes | Very light duty, pedestrians areas: gardens, patios and driveways |
| B125 | 12.5kN / 12.5 tonnes | Light vehicular traffic up to 12.5 kN or 12.5 tonnes |
| C250 | 25 kN / 25 tonnes | Used for verges, car parks, and light traffic areas |
| D400 | 40 kN / 40 tonnes | Large utility/industrial access chambers |
| E600 | 60 kN / 60 tonnes | For industrial areas with heavy loading |
| F900 | 90 kN / 90 tonnes | Suitable for areas like airports with extreme heavy loading |
Selecting the correct load class is essential to ensure safety and durability, preventing cover failures under load, which can lead to accidents or system damage.
Understanding these factors helps in choosing the right manhole cover for specific applications, ensuring both safety and functionality in drainage systems.
