Look what’s hard at work under the Mancunian Way - our robot friend Cisbot

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Look what’s hard at work under the Mancunian Way.
A robot working unseen, underground, to check and seal joints in an old gas main that runs under one of Manchester’s busiest roads.
Cadent, which manages the North West’s 21,000-mile gas distribution network, has deployed Cast Iron Sealing Bot – or Cisbot, for short – under the city’s streets for the first time.

Motorists and pedestrians are just metres above as it works inside mains that stay ‘live’ – so gas continues to flow safely around the robot and there is no interruption to supply.
And another major bonus: it’s operated remotely by engineers working from a special vehicle to the side of the carriageway – so there is minimal disruption to road users.
Measuring 12 inches by 35 inches, the robot sends live images back to the team in that control vehicle, as it checks every joint and applies a special sealant.
This technology was first used in New York and Boston, and later in London (by Cadent) and Edinburgh. Cadent is also using it in Norwich.
Cadent arranged two North West trials late last year, in Oldham and Salford. Impressed with the results, it has now deployed Cisbot under central Manchester.
In recent weeks, the robot has sealed 62 joints in a 240-metre section of gas main under Higher Cambridge Street and 40 joints on a 145-metre section under Loxford Street.
Cadent has identified dozens of similar jobs, in total around 4km of mains, for Cisbot to work on this year in Manchester. This includes the Mancunian Way and other city centre streets.
Mark Berry, Head of Customer Operations, Cadent, said: “This is amazing technology, allowing us to extend the life of our older gas mains, without disrupting our customers or road users.
“Over time, the joints in these ageing mains naturally start to degrade. If they ever developed a leak and we had to repair them, that would mean digging down and possibly being in situ for weeks at a time. For a road like the Mancunian Way, that would be hugely disruptive.
“Cisbot checks all of these joints, one by one. It drills holes into them and injects a special sealant. This can extend the life of the main for many decades. Everyday life and travel carries on as normal above it and the gas network stays safe and sound, as it must be.”
Developed by US company ULC Robotics, whose specialist engineers are carrying out this work in the North West, Cisbot is also being used by Cadent in London and Norwich.

How Cisbot works

The robot enters and exits the gas main each day through a sealed launch tube. There is no risk of a fire or explosion, as the pipes have no oxygen inside them. Using three wheels, Cisbot is able to rotate 360 degrees around the main, drilling into the joints and applying the sealant.
In New York City, the robot was reported to have found a number of foreign objects inside the gas mains, including a baseball and stiletto shoes. It found a 1939 edition newspaper under Boston.

Why gas is so important to Manchester

Gas remains a vital part of Manchester’s energy landscape. More than 80 per cent of the city’s households are heated by gas, as well as schools, hospitals and other buildings. Many heat-intensive industrial processes depend on gas and it is also the fuel of choice for many HGV fleets.
Cadent is working with Greater Manchester Combined Authority and many other local stakeholders to help bring greener energy to the region. For example, HyNet North West is on-track to distribute zero-carbon hydrogen to North West homes and to industry by the mid 2020s.

Cadent in the North West

Cadent manages the 21,000 miles of gas mains that run under North West England.

These carry gas safely to 2.7 million properties – from homes and hospitals, to schools, workplaces, industrial sites and HGV fuelling stations. That amount of pipes, if placed end to end, would run from Manchester to Sydney, Australia, and back again.
Working from 14 depots from Kendal to Crewe, including bases in Rochdale, Hollinwood and Bolton, Cadent also provides the North West’s 24/7, 365-day gas emergency service.


Cadent is the UK’s largest gas distribution network with a 200-year legacy.  We are in a unique position to build on strong foundations whilst encouraging the curiosity to think differently and the courage to embrace change.  Day to day we continue to operate, maintain and innovate the UK’s largest gas network, transporting gas safely and protecting people in an emergency.   Our skilled engineers and specialists remain committed to the communities we serve, working day and night to ensure gas reaches 11 million homes from Cumbria to North London and the Welsh Borders to East Anglia, to keep your energy flowing. 

Future of Gas: Here at Cadent we support the Government’s plans to reach Net Zero by 2050. That means we’re backing the introduction of hydrogen as a low carbon alternative to natural gas for the future. We know people love the controllability of gas and, with our network already in place, it makes sense to switch to the lower carbon alternative offered by hydrogen, which we believe can keep homes and businesses warm for generations to come.

Cadent manages the national gas emergency service free phone line on behalf of the gas industry - 0800 111 999*

Cadent Gas Ltd is owned by a consortium of global investors.

*All calls are recorded and may be monitored.

Media contacts

Kevin Hegarty


07970 694897