How Much Do Manhole Covers Weigh?

February 14, 2024

Across cities, manhole covers act as the entry points to a hidden world, upholding and protecting the complex web of underground utilities that power our modern-day societies. These sturdy, yet unpretentious, structures are an embodiment of the durability and strength demanded by the bustling urban landscape they inhabit. Their weight is a tangible reminder of the unyielding support they provide, serving as sentinels that silently guard the intricate labyrinth of subterranean services.

The answer to how much do manhole covers weigh isn’t quite as simple as it may seem at first glance. Various factors contribute to the weight of these crucial fixtures, which range from 90 to 150 pounds for standard cast iron manhole covers to hundreds or even thousands of pounds for larger-diameter covers. Generally, a larger-diameter cover will be more costly to make than a smaller one due to the additional material required.

In addition to the added cost, a larger-diameter manhole cover will be more susceptible to damage from traffic and other environmental factors. Thieves have also been known to steal manhole covers, primarily for the scrap metal they contain, leading to dangerous open manholes in some cases.

While lighter materials could be used to reduce the weight of these vital fixtures, cast iron is often preferred for its strength and longevity. Ductile iron (also known as cast iron) is an ideal material for manhole covers because it can withstand high levels of pressure without cracking or deteriorating over time.

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