MANHOLE CASTING REFERENCE GUIDE
MANHOLE CASTINGREFERENCE ........................................ ........2Load ........................................ .....................3Key Dimensions of Round Frame and Cover ................3Key Dimensions of Inlet Frame and Grate ....................4Frame Designs ........................................ ......................5Grate Designs ........................................ .......................6Curb Inlets or Combination Inlets .................................7Watert ight Frames and Covers .....................................8Ai rport Castings ........................................ .....................8Manhole Features ........................................ .............9-10NATIONAL PRECAST CONCRETE ASSOCIATIONWith nearly 1,000 member companies, NPCA serves as the voice of the precast concrete industry in the United States and Canada.
Vane Grate The vane grates allows better hydraulic efficiency. Vane Grate with Cross Bars Vane grates, which have better hydraulic efficiency, are angled toward the flow of water. The vane grate offers longitude bars that are friendlier toward bicycles. Diagonal Grate The designer must be aware of the ADA requirements before using this grate.
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