PVC Manhole Covers - Fiberglass Manhole Chamber - Composite Access Covers - Composite Access Gratings

PVC, or polypropylene manhole covers are the cheapest and lightest manhole covers we stock. They are commonly used for light traffic applications, such as gardens and walkways. They can't, however, be used in heavy traffic applications due to their load rating.

Purpose of Manhole

The main purpose of a manhole is:

1. To perform inspection, cleaning, and removal of any obstruction present in the sewage line.
2. The joining of sewers, the change of direction or the alignment of sewers can be performed with the help of manhole.
3. These have a perforated cover which helps the foul gases to escape. Hence it is a good means of ventilation for the underground sewage system.
4. Manholes help to lay the sewer line in the conventional lengths.

Manhole Cover Materials

Two major materials used for the construction of manhole cover are cast iron and concrete. These two materials are also used in combination with the construction of manholes. Both the materials are durable, heavy and inexpensive. With technology, manhole covers are made from fiberglass, plastic, and composite.

Cast Iron Manhole Cover is cast out of gray cast iron. As ductile cast iron is higher in strength, it is used for manholes that are supposed to take heavy loads ( Airport areas). The gray cast iron used for manhole cover manufacture is a combination of carbon and silicon. The carbon gives strength and durability to the element. The addition of manganese to the molten iron gives ductile cast iron.