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2. List of pipeline accidents in the United States (1900–1949)

   en.wikipedia.org/wiki/List_of_pipeline_accidents...

   This caused a string of sewer explosions, causing manhole covers to fly 10 feet (3.0 m) into the air. [ 62 ] March 18 – The 20 inch diameter " Little Big Inch " natural gas transmission pipeline near Petersburg, Indiana exploded and burned, throwing pieces of the pipe as far as 300 feet (91 m) away from the blast point. 3 homes were destroyed ...

3. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

4. Sanitary sewer - Wikipedia

   en.wikipedia.org/wiki/Sanitary_sewer

   The larger line enters from the right and changes direction within the manhole to exit from the top of the photo. A smaller line enters from the bottom of the photo under the access steps. The concrete floor of the manhole has channels to minimize accumulation of solids. Interior of a large sanitary sewer viewed from an access manhole chamber.

5. Sacramento’s history is underfoot. Take note of these manhole ...

   www.aol.com/sacramento-history-underfoot-note...

   The manhole cover business has turned over the years, from the sort of ornate covers that a business like Berry’s Foundry might have crafted to drabber covers that dot Sacramento’s streets today.

6. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   A sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...

7. Louisville sewer explosions - Wikipedia

   en.wikipedia.org/wiki/Louisville_sewer_explosions

   [2] [7] [14] Manhole covers shot up into the sky and came crashing down with great destructive force. [ 14 ] [ 15 ] [ 16 ] One manhole cover crashed completely through the ceiling and floor of a third-floor apartment on Second Street, and another narrowly missed a child when it landed in a house at the corner of 9th and Hill streets. [ 15 ]