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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.
A manhole cover for a sanitary sewer access point. View looking down into an open manhole showing two converging sanitary sewer lines. 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.
Typical manhole barrel thickness is 3 ⁄ 8 – 1 ⁄ 2 inch (10–13 mm) thick. Thickness is assumed to be solid barrels only (not including any exterior ribbing). For manhole barrels with ribbing laminated to the exterior of the barrel, the barrel thickness is allowed to be thinner than otherwise would be allowed under ASTM D 3753.
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 ...
A travel expert revealed the science of why food and drinks taste different on a plane — and what he chooses to order once the beverage cart comes around.
Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...
Dr. Thomas O’Brien and his wife Ruth Reardon O’Brien, the parents of late night comedian Conan O’Brien, have died three days apart. Thomas was 95 and Ruth was 92. The couple were married 66 ...
Ariana Grande, the pop music and "Wicked" star, is speaking out about comments surrounding her body, calling the comments "horrible."
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