Traffic Tops for Packaged Metering Manholes

For installations where a Packaged Metering Manhole will be subjected to vehicle traffic (AASHTO H-20/HS-20) , formed reducers are necessary to transfer the load to the manhole walls.

Laminated to the top of the manhole barrel, the reducer provides a bench on to which standard grade rings / frame / cover stack is installed. Grade rings are usually concrete and the frame / cover system cast iron. However, for corrosive applications, composite grade rings (Ladtech) and frames / covers (GMI) can be used.

typical manhole grade ring frame and stack assembly

Extending up from the reducer is a 4-inch lip that helps to prevent inflow into the manhole in the event that the cover stack is not completely sealed.

Access

Openchannelflow offers a concentric 31 3/4-inch opening reducer for its 48, 60, 72, and 96-inch diameter manholes. The opening provides twice as much area for an operator to access the manhole than a traditional 22 1/2-inch reducer.

Openchannefllow also offers:

38-inch concentric
22 1/2-inch eccentric
36-inch eccentric reducers

to help customize the manhole to your particular application needs.

h-20 vehicle traffic reducer on an Openchannelflow fiberglass Packaged Metering Manhole

Vehicle (H-20) reducers are available for 48, 60, 72, and 96-inch diameter manholes. Retrofit reducer kits are also available for installations where regrading of a site calls for a new top (either by damage or use change).

Image: Hamilton Kent

Required

For installations where a Packaged Metering Manhole will be subjected to vehicle traffic (AASHTO H-20/HS-20) , formed reducers are necessary to transfer the load to the manhole walls.

Extending up from the reducer is a 4-inch lip that helps to prevent inflow into the manhole in the event that the cover stack is not completely sealed.

Access

Openchannefllow also offers:

38-inch concentric
22 1/2-inch eccentric
36-inch eccentric reducers

to help customize the manhole to your particular application needs. Vehicle (H-20) reducers are available for 48, 60, 72, and 96-inch diameter manholes. Retrofit reducer kits are also available for installations where regrading of a site calls for a new top (either by damage or use change).

Image: Hamilton Kent

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.