The key lock is integrally cast-in during the production process providing a secure seal for storm water and sanitary collection systems. Download Literature. A flexible pipe-to-structure connector shall be employed in the connection of the sanitary sewer pipe to precast structures. The connector shall be the sole element relied on to assure a flexible, watertight seal of the pipe to the precast structure. The connector shall consist of a rubber gasket and an external take-up clamp.
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Except as noted in Section Distances up to feet may be approved in cases where adequate modern cleaning equipment for such spacing is provided. Greater spacing may be permitted in larger sewers and in those carrying a settled effluent. Lampholes may be used only for special conditions and shall not be substituted for manholes nor installed at the end of laterals greater than feet in length. A pipe shall be provided for a sewer entering a manhole where its invert elevation is more than 24 inches above the manhole invert.
If an inside drop pipe is used, the manhole diameter shall be large enough to provide a minimum clearance of 48 inches between the pipe and the opposite side of the manhole.
Inside drip pipes shall be anchored to the manhole wall with corrosion-proof fasteners and bands. For sewers 36 inches in diameter or greater, the requirements for a drop pipe do not apply if the spring line of the incoming pipe is at or below the spring line of the main sewer. Where the difference in elevation between the incoming sewer invert and the manhole invert is less than 24 inches, the manhole invert should be filleted to prevent solids deposition.
For sewers larger than 36 inches in diameter, the manhole diameter at the invert shall be sufficiently large to accommodate the incoming pipes; and the riser barrel diameter shall be a minimum of 48 inches.
The flow channel through manholes should be made to conform in shape and slope to that of the sewers. A bench shall be provided which should have a minimum slope of 2 inches per foot.
Watertight manhole covers shall be used wherever the manhole tops may be flooded by surface runoff or high water or are below cover. Pickholes shall not be larger than 1 inch in diameter or shall be of the concealed type. Construction lifting holes on manhole rings shall be plugged from the outside and the exterior and joints of the manhole elements shall be waterproofed. Precast inlet and outlet connections fitted with "0" rings or other equally watertight connections shall be provided.
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