How to measure a manhole cover-Keep away from Danger!

Look at the cracks on the manhole cover.

What do you see?

What I see is more than a cracked manhole cover. It is the source of tragedies.

There's no doubt that this manhole cover is not able to bear the same load as it was. Also, the crack might develop into a hole, resulting in accidents like trips, falls, death and damages to car tires and rims.

To avoid the accident to people, bicyclists and motorcyclists, the broken manhole covers should be replaced in time.

To replacing the manhole cover, an important step is to correctly measure a manhole cover.

How to measure the size of a manhole cover?

The cross-section of a manhole cover sitting on a manhole.

It is often thought that the size of a manhole cover should be measured by its external dimensions (D). Actually, it's WRONG!

The right thing to do is to measure "O", the clear opening size of the manhole. "O" is the most important parameter we need to get.

To get the most accurate measurement, measure directly across the middle making sure to measure the widest points possible. Swaying the tape and measure back and forth helps to find the widest points.

What to do with a square manhole?

Remember, it is the clear opening size that matters. Just measure the width and length of the clear opening.

BUT! If you're going to replace the manhole cover with an inspection chamber underneath, you have to measure the size of the chamber.

Taking a photo for your measurement result is not necessary but the photograph might help when you communicate with the manhole cover seller.

In some cases, even when measured correctly, it can be difficult to find the perfect cover to suit your needs. This is why many manhole sellers offer a bespoke fabrication service. Whatever the problem, Jinmeng will answer any questions you may have and find the solution for you.