Types of Manhole Covers

manhole dome top lid

Manholes are a convenient solution to flow rate measurement challenges for underground flow channels, as they offer easy access to any underground measurement device. There are a lot of factors that go into a manhole design. You can choose among three primary styles of fiberglass manholes, and you’ll need to determine which is best for your unique needs. Here’s what you need to know about the types of manhole covers.

Dome Top

When you implement a dome top manhole cover, you can enjoy convenient access to the interior, making it easy to read any flow rate measurements or perform any necessary maintenance. This top features a lockable hasp and steel piano hinge to make it easy to open while also keeping the top secure. Additionally, you’ll find a locking lift arm within to ensure that the top stays open when people are inside.

One of the most important aspects of any manhole cover is where the manhole is placed. A dome top is useful in that it makes the manhole stand out. This style of manhole wouldn’t be very effective in high traffic areas, of course, as it would wreak havoc on cars and could cause pedestrians to trip. Because of this, it’s best to use the dome top style when the manhole is in an area that doesn’t get any traffic.

Highway Traffic Loading

With this manhole cover, you can rest assured that it can withstand virtually any kind of pressure it may normally face. This cover was designed to withstand repeated pressure from passing cars while maintaining its strength and integrity. This kind of strength and resilience is only possible thanks to its adherence to the American Association of State Highway Transportation Officials (AASHTO) H-20 axle loading specification.

You can use this type of cover in a variety of areas that would experience high vehicle traffic. This includes roads, highways and parking lots. Even roads that wouldn’t normally experience traffic from heavy trucks should still opt for this style given its strength and resilience. For extra convenience, this style also includes a pull-up ladder assist, provided the manhole itself is deeper than four feet.

Aluminum Hatch

Given the sheer strength of highway traffic loading covers, it may be overkill to use this type of manhole cover in areas that only receive pedestrian traffic. Instead, you may want to consider the aluminum hatch style. It lies flat on top of the manhole, so no one will trip over it. Additionally, you can use this type of manhole cover if you’re trying to keep the manhole entrance low profile. Aluminum hatch designs can be customized quite a bit with several options. You don’t even have to opt for aluminum construction, as steel is another material available. You can also choose whether your hatch is watertight. Additionally, lock configurations, custom engraving and spring assists are available as well.

Find Manholes at Tracom

When you’re deciding between the types of manhole covers, you’ll have to choose among three primary options. No matter which direction you’re leaning in, however, Tracom has got you covered. Not only will you be able to get state-of-the-art manhole covers, but we also offer full packaged metering manhole solutions. Contact us today to learn more.

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