Q.Why are manhole covers round?
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Answer:
The EPDM sealing gaskets are used in every set of CO900mm gas station manhole cover and frame to ensure the UST(underground storage tank) have complete leakageproof.
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the biggest reason that manhole covers are round is that round covers can’t fall through a circular opening. “For all manholes, there is a ‘lip’ around the rim of the hole, holding up the cover, which means that the underlying hole is smaller than the cover,” Scheckel writes. “A round manhole cover can’t fall through its circular opening, because no matter how you position it, the cover is wider than the hole. But a square, rectangular, or oval manhole cover could fall in if it was inserted diagonally into the hole,” which would be bad news for unobservant pedestria
ns and drivers alike.
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