A brief guide to manhole covers

Manhole covers are seen everywhere, you name it; there will be a manhole cover in it or around it.

While they are commonly used and seen widely, nobody really pays them much attention. However, when it comes to choosing a suitable manhole cover, most of us are left in the dark, literally, so here’s a few tips to help you learn more about them:

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What is a manhole cover?

Whilst this is fairly obvious, basically a manhole cover is a removable plate forming a lid over an opening or hole. The covers help to prevent anyone falling, as well as keeping unauthorized people out of important pipelines and drainage.

What size do I need?

This is where it can get a little confusing, as manhole covers are made and registered by the ‘clear size opening’ which means the size of the hole the cover is needed for and not the actual diameter of the manhole cover.

An example would be a manhole cover states it is 600 by 450mm it will probably be closer to an overall measurement of 650 by 550mm but will be designed to fit a hole with the size of 600 by 450mm, therefore, the size will be registered as the size of the hole. For your drainage needs, contact a Groundwork companies Bristol. Find a site like Chew Valley for your Groundwork companies Bristol requirements.

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Sourcing the correct size is highly important, not big enough and manhole covers are likely to fail. Having a cover that’s too large cover can be ok, but only if the cover has no reinforcing on the underside. It is always best practice to source the correct size cover.

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