Manholes and handholes have the function of granting access to a confined space. The only difference between manholes and handholes is the size of the opening: an adult fits through a manhole, whereas only a hand or an arm fits through a handhole. Manholes and handholes are composite items which consist of a manhole ring, a manhole cover, a rubber gasket, bolts and possibly a coaming welded to the manhole ring (depending on the type). Are you wondering about the various materials, shapes and models? Keep on reading if you want to discover more.
More informationA manhole can also be referred to as tank opening or inspection opening. Some customers use the term manhole cover, although we see it as part of a complete manhole.
Manholes and handholes come in many shapes and sizes:
The oval manholes are often used. They come in the following types:
The stainless-steel and aluminium manholes are fitted with stainless-steel bolts as standard.
Steel manholes are standard delivered without bolts. Galvanised or stainless-steel bolts can be ordered separately.
Aluminium manhole rings are supplied with stainless-steel thread inserts as standard.
The quality of the materials used is as follows:
The pictures below give an impression of the working of manholes with one central bolt:
Some components are also available separately.
See the article group ‘Rubber seals’ for the rubber gaskets used for manholes.
Would you like more information? Then contact us. We will be happy to help.