Safety is non-negotiable in any worksite, residential area or industrial site. Both for safety and access to underground drainage, manhole covers and frames are essential. They are reliable solutions available in a range of grades, with variations based on material, durability and installation location. Commercial and public environments often require heavier-duty solutions for safety and compliance.
In this helpful article, we’ll explore how to choose the right solution for your specific application, as well as the importance of choosing manhole covers and frames that comply with recognised standards such as BS EN 124:2015.
Why are Manhole Covers Important?
If you have ever driven on a road or travelled along a pavement, you have likely crossed over a manhole cover without noticing. These covers prevent people, vehicles and debris from falling into underground drainage systems while still allowing essential access when maintenance is required.
Along with protecting public safety, manhole covers and frames provide essential access to underground drainage systems. This access is crucial when maintenance or repairs are required, helping to prevent flooding and resolve other drainage issues without severe digging or infrastructure work. Manhole covers and frames help with simplifying tasks while maintaining a safe environment.
Where Can Manhole Covers Be Used?
A manhole cover can be utilised anywhere that requires access to underground drainage. For this reason, they’re utilised in a wide variety of areas such as residential and commercial environments.
In residential settings, they are commonly installed in driveways, gardens and patios to allow inspection and maintenance of household drainage. Commercial and public environments often require heavier duty solutions. Car parks, roads, industrial estates and loading areas typically need covers designed to withstand higher traffic volumes and heavier vehicles. The environment will often determine the grade of the required manhole cover.
What to Consider When Choosing Manhole Covers
Not all manhole covers are the same, and some are more practical than others, depending on a few key factors we’re going to delve further into.
1. Load Ratings
Load rating is one of the most important aspects when it comes to choosing the right manhole cover. It determines how much weight the cover can safely support. Different environments require different load classes, as manhole covers are exposed to varying loads depending on traffic and usage.
Pedestrian areas such as gardens, pathways and parks may only require lighter duty covers such as A15, which can support loads of up to 1.5 tonnes. Areas exposed to vehicles, such as driveways or car parks, require higher load classes, such as D400, while industrial sites, distribution centres and motorways demand heavy duty covers designed to withstand significantly greater loads and constant traffic.
2. Materials
Manhole covers are manufactured from a range of materials to suit different environments and applications. Each material offers its own advantages depending on the installation. Common options include galvanised steel, ductile iron and polypropylene.
Galvanised steel provides durability and strength, excellent for footways and car parks. Ductile iron is manufactured to support heavy traffic loads and still provide access to drainage systems. Polypropylene is lighter and corrosion resistant, making it suitable for residential settings or locations where manual access is frequent.
When choosing materials, it is important to consider factors such as load requirements, exposure to moisture or chemicals, weight and long term maintenance needs.
3. Compliance
Since manholes are exposed to varying environments and demands, it’s vital they meet safety and performance standards. This helps ensure they’re suitable for their specific application. These solutions need to be in accordance with BS EN 124:2015, which is the standard for designing, performance testing and classifying manhole covers and gully tops. The standard was updated in 2015 to specify the requirements for cast iron, steel, composite materials and polypropylene.
Further guidance on the standard can be found through the British Standards Institution (BSI).
4. Access Requirements
Some manhole covers require more frequent access than others, which should be considered during specification and installation. Residential drainage chambers, for example, often need periodic access for inspection, maintenance or blockage clearance. In these cases, lighter covers or designs that allow easier lifting can be beneficial for easier access.
In contrast, manhole covers installed in areas such as industrial estates are designed to withstand heavier loads from vehicles such as lorries. These covers often prioritise strength and durability and may incorporate secure locking mechanisms or require specialist lifting equipment. Selecting the right cover involves balancing accessibility for maintenance with the level of security and load resistance required for the environment.
5. Installation
The importance of professional installation can not be overstated. It’s essential to ensure top performance and longevity for manhole covers and frames. Even the most robust covers can fail if poorly supported or installed incorrectly.
It’s important to use the correct frame, the surrounding surface needs to be properly prepared and the cover needs to align with the finished ground level. Adequate structural support is also necessary to distribute loads evenly and prevent movement over time. A professional installation will keep covers functioning as intended and compliant with relevant safety standards.
Conclusion
Choosing the right manhole cover involves deep consideration of several factors, including load requirements, installation environment, material selection and regulatory compliance. It’s important to be duly diligent during this process and consult with experienced professionals if you have any queries. Taking the time to make sure your manhole cover meets these regulations can ensure it performs safely and reliably in its intended location.
