Replacing a manhole cover may seem easy. You pick up the old one and put down a new one doesn't seem like much of a challenge. However, when it comes to manhole covers, it's often not so easy. With this in mind, we have put together a detailed guide on how to choose from the manhole covers available on the market.
The frame and cover are designed to fit together perfectly. Unless your access hole was recently installed, there is a good chance that you will not find a cover that fits perfectly with the frame you already have. Even if you do find a cover that seems to fit well, there is a good chance that it will not have the same overall strength when paired with a frame that does not fit it.
In short, your installation may have to involve replacing the frame and cover. In some cases, frames and covers that are not designed to work together can lead to serious accidents.
Again, just like your choice of material, the shape of the access hole you choose may depend on what looks best.
Round manhole covers will not fall off on their own. The nature of round shapes makes them most resistant to any earth compression around them.
Some rectangular or square drain covers are actually split into two parts. forming two triangles. This shape is often used on roads. This is because it is less likely to rock back and forth, thus limiting wear and tear and preventing damage to the vehicle from the slightly raised edges.
Today, polypropylene plastic manholes are often as strong and durable as iron manholes. The choice of material is therefore no longer as important as it once was. Galvanized steel manhole covers are often lighter and easier to install than some other materials. Therefore these tend to be popular products.
As long as you use the correct load capacity, your choice of material can really boil down to the one best suited to your application.
We are a manhole cover manufacture, please feel free to contact us if you need them.
