Manhole covers have been seen powerfully flying up into the air across the world. A phenomenon that we are trying to stop taking off. Manhole rehabilitation is an increasingly sought after service, which needs highly trained staff like ourselves to work in confined spaces.
This video shows how powerful manhole explosions can be. Both were down to gases building up inside the sewers.
Man in China seriously injured by exploding Sewerage Gas
How do gases build up in sewers and manholes
Hydrogen Sulphide (H2S) can build up in sewers if water becomes stagnant. H2S or sewer gas, is a highly flammable toxic gas that has the pungent smell of rotten eggs. At high concentrate levels the gas becomes odourless and is a major safety hazard in wastewater plants and sewers. Stagnant water is the main catalyst of chemical reactions causing gases to be formed. Once these gases are formed specialist trained workers are needed to rectify the problem.
High powered underground cables
Over time cables become worn and torn through corrosion, ageing or even rat bites. Underground cables often supply business and transport systems requiring high amounts of energy. Overload of these wires can lead to them heating up with the mix of wear and tear. Once again gases can be released but more problematic is the fact that sparks can be created resulting in powerful explosions.
Manhole rehabilitation instead of replacement
Manhole rehabilitation can prevent serious problems before they occur. Simply clearing the manhole of blockages can get rid of sewage temporarily but will not combat the problem in the future.
Our manhole liners will provide a smooth relining of the manhole subsequently stopping debris from building up in the future. The lining also provides manhole rehabilitation which is chemical resistant and leak tight to water infiltration.