Manhole rehab specialists, cementitious, geopolymer, and epoxy linings to extend asset life and stop I&I.

    Find a Manhole Rehabilitation Provider

    Matched providers: 17

    Top countries: United Kingdom

    Category focus: Infrastructure, Networks & Equipment

    Manhole Rehabilitation Methods: Structural Lining, Chemical Grouting, and Frame Replacement

    Manhole rehabilitation addresses structural deterioration (cracking, spalling concrete, corroded brickwork), infiltration of groundwater through joints and walls, and exfiltration of sewage to groundwater. Deterioration mechanisms include: microbially induced corrosion (MIC) where H2S gas generated in anoxic sewers reacts with surface moisture and oxidises to sulphuric acid (pH below 2 at crown), dissolving calcium silicate hydrate in concrete at rates of 1 to 10 mm per year in aggressive systems; hydrostatic groundwater pressure causing joint opening and cracking; and freeze-thaw cycling in cold climates causing spalling. Manholes with concrete crowns at or below the sewer water table are at highest MIC risk.

    Rehabilitation methods by deterioration type: structural repair by spray-applied cementitious liner (minimum 10 mm, alkalinity-resistant, epoxy-modified mortar achieving pH 13 to resist ongoing MIC) for MIC-damaged concrete; polyurea or polyurethane spray lining (1 to 5 mm, 100 percent solids) for watertight membrane against infiltration; chemical grouting (polyurethane grout, expanded in situ at cracks and joints) to stop active infiltration before structural lining; and full fibre-reinforced plastic (FRP) liner insertion for severely deteriorated manholes requiring structural replacement without excavation. Frame and cover replacement addresses surface level adjustment (raising by frame extension rings) and load-bearing capacity (upgrade to D400 or E600 class covers per EN 124).

    Post-rehabilitation testing: vacuum test (EN 1610 acceptance test, apply -0.1 bar vacuum for 5 minutes, pressure rise below 0.025 bar indicates acceptable leak tightness) for new or rehabilitated manholes. CCTV inspection inside the manhole after rehabilitation verifies lining coverage, joint treatment, and absence of voids. Cost comparison: spray cementitious lining of 1.8 m diameter manhole 3 m deep: $800 to $2,000; polyurea lining: $1,200 to $3,000; full FRP liner: $3,000 to $8,000; open excavation and replacement: $10,000 to $30,000. Trenchless rehabilitation is preferred in trafficked roads where excavation cost and traffic management cost would multiply total project cost by 3 to 5 times.

    Frequently Asked Questions

    What causes manholes to deteriorate?

    Three primary deterioration mechanisms affect manholes. First, microbially induced corrosion (MIC): anaerobic bacteria in sewers produce hydrogen sulphide (H2S) gas, which oxidises to sulphuric acid at the damp crown and walls above the waterline by Thiobacillus bacteria, attacking concrete (pH below 2 at the surface). Concrete loss rates of 1 to 10 mm per year occur in severe cases. Second, groundwater infiltration: hydraulic pressure forces water through cracked joints and walls, which erodes mortar joints (particularly in brick manholes) and washes fine particles into the sewer (I&I - infiltration and inflow). Third, traffic loading: heavy vehicle loading causes settlement of manhole frames, cracking of cone sections, and joint displacement, exacerbated by differential settlement in fill material around the manhole.

    What is the difference between grouting and lining a manhole?

    Grouting addresses active water infiltration: polyurethane or polyacrylate grout is injected under pressure through drilled holes into cracks, joints, and the surrounding soil annulus. The grout expands on contact with water, filling voids and forming a watertight plug. Grouting is a pre-treatment step to stop active water ingress before applying a structural liner; grouting a still-wet surface is practical, whereas lining requires a relatively dry surface. Lining applies a structural layer to the interior of the manhole to restore structural integrity, smooth the surface, and provide a corrosion-resistant barrier. Cementitious liners (spray-applied, 10 to 25 mm) resist ongoing H2S attack by high alkalinity. Polyurea liners (1 to 5 mm spray) are impermeable membranes used primarily for watertightness rather than structural repair. The two are often used together: grout first, then line.

    How long does manhole rehabilitation last?

    Service life of rehabilitated manholes depends on the method and ongoing exposure. Spray cementitious mortar lining in a moderately corrosive sewer (H2S below 200 ppm): 20 to 30 years. High-build epoxy lining (3 to 5 mm): 15 to 25 years in moderate corrosion. Polyurea spray lining (flexible, crack-bridging): 25 to 40 years if UV-protected (polyurea degrades under UV if not topcoated with polyurethane UV coat, relevant for manholes with open covers). Full FRP liner (factory-manufactured, installed as one-piece or assembled ring section): 50-plus years. Open-cut replacement with precast concrete manhole: 50 to 80 years. Longevity is heavily dependent on the ongoing corrosion environment; any rehabilitation in a high-H2S system (above 500 ppm H2S in sewer atmosphere) will fail more rapidly without ongoing gas control at source (ventilation, dosing of nitrate or iron salts to suppress H2S generation).

    How are manholes inspected before rehabilitation?

    Pre-rehabilitation condition assessment uses: (1) Visual inspection by entry (where safe) or CCTV camera mounted on a mast lowered into the manhole - identifies cracking, spalling, joint defects, active infiltration points, and MIC damage zone extent; (2) Hammer-sounding of concrete to identify delamination and hollow sections (hollow sound indicates debonded material at risk of fall); (3) Concrete carbonation test (phenolphthalein indicator spray - uncarbonated concrete pH above 10 stays pink, carbonated zone pH below 8 stays colourless); (4) H2S gas measurement (4-gas meter before entry for health and safety, and continuous monitoring during inspection; H2S above 10 ppm requires SCBA or forced ventilation); (5) Dimensional survey for frame level, cone geometry, and liner thickness estimation. Inspection results are used to specify the appropriate rehabilitation method and material quantities.

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    Manhole Rehabilitation Companies

    Manhole rehab specialists, cementitious, geopolymer, and epoxy linings to extend asset life and stop I&I.

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    Networks - Sewerage5
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    Showing 1-17 of 17

    17 results from 17 matched providers

    Headlight AI Limited logo

    Headlight AI Limited

    United Kingdom

    Headlight AI is a UK based technology company developing sensing, mapping, and inspection solutions for extreme environments. The company works primarily with Utility companies and contractors to provide condition assessment and geo-location data in subterranean locations, especially for large diameter assets (such as sewers, culverts, and tunnels with diameters >900mm), with a focus on autonomous or semi-autonomous systems that avoid the need for person-entry (in particular NC3 or NC4 confined space entry), improving workers’ health and safety. The company supplies its award winning product, Telesto, to utility companies and contractors in order for them to collect multi-sensor data, including LiDAR, on either robotic or floating platforms. The data is then processed to account for the motion of the system and to produce 3D point cloud and multi-image data for further analysis. Users can access the information via the web-based Telesto application, which provides condition assessment dashboards and statistics relevant to the asset, achieved using novel artificial intelligence (AI) models. The company currently has several other products and features in development to further assist with underground inspections and surveys, and provide new ways to navigate and locate in GPS-denied and extreme environments.

    Smart Water
    Asset Maintenance & Rehabilitation
    Hydro International logo

    Hydro International

    United Kingdom

    Hydro International, a CRH company,  provides advanced products, services and expertise to help municipal, industrial and construction customers to improve their water management processes, increase operational performance and reduce environmental impact. Hydro International can help water companies meet their AMP and environmental obligations, including the reduction of sewer overflows and the Water Industry National Environment Programme (WINEP). Hydro International provides total solutions for Inlet Works, Combined Sewer Overflows (CSOs), Stormwater Management, Flood Warning and Prevention, and Water Resource management, from design to supply and installation through to ongoing preventative maintenance, servicing and emergency repair.  These solutions include: Hydrometric data collection, monitoring analysis and reporting for river level, reservoir, network and weather. Continuous water quality monitoring for compliance with Section 82 of the Environment Act. Water resource analysis and consultancy. Stormwater management solutions, including options for Sustainable Drainage Systems. (SuDS) and Smart Maintenance. CSO event duration monitoring. CSO and storm tank treatment and screening. Passive flow controls for flood prevention schemes, SuDS, CSOs and WwTWs. Inlet works screening and grit removal solutions. Sludge screening. Dropping sewage or water safely from height. Hire, repair and maintenance of inlet works screens and screenings handling equipment

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Technocover Ltd logo

    Technocover Ltd

    United Kingdom

    Technocover is an approved ISO 14001:2004 Environmental and ISO 9001:2008 Quality Accredited Company, dedicated to the Design, Manufacture, Installation and Maintenance of Physical Security Access Solutions for protection to all industrial sectors. Our extensive in-house design and manufacturing facilities are home to well established research and development unit and comprehensive testing facility. Our commercial offices incorporate our design team who utilise the latest computer aided design technology and work alongside our dedicated planning section who oversee everything from surveying, scheduling and contract reviews, to the management of framework agreements. We have been designing and manufacturing innovative steel products since 1993. In that time, through organic growth, planned expansion and acquisition, we have gained a reputation as the UK’s leading supplier of Physical Steel Security Access Products. We have a range of aperture security solutions for virtually every application, establishments in the UK and overseas have sought our expertise in providing security products for asset protection. We operate a Total Service Philosophy and can handle complete projects from site survey to final installation, whether for new or refurbishing projects, the adaptability of our galvanised steel access products means the most complex design criteria can be met. Our range of high quality access products offer custom built operational and security solutions to prevent unauthorised persons gaining access, securing key assets against all levels of trespass, malicious vandalism, theft, extortion, contamination or terrorism. Many of our access system products have been tested and approved by the Loss Prevention Certification Board (LPCB)  to LPS 1175 issue 5 or above, Security Rating Levels 2, 3, 4 or 5. Frameworks We hold both exclusive and shared framework agreements with most of the major UK water companies. Framework Security items include: LPCB Level 2 Universal Gas Cylinder Clamps LPCB Level 3 Mesh Cage Systems LPCB Level 3 Flush Access Covers LPCB Level 4 Upstand Access Covers LPCB Level 4 Padlockable Access Doors LPCB Level 4 Key Entry Doors LPCB Level 4 Enclosures/Kiosks/Cabinets LPCB Level 4 Walk-In Modular Buildings LPCB Level 4 Window Bar Sets LPCB Level 5 Louvres

    Security Solutions
    Asset Maintenance & Rehabilitation
    SUEZ Advanced Solutions UK Ltd logo

    SUEZ Advanced Solutions UK Ltd

    United Kingdom

    Unique integrated water solutions and unrivalled expertise. Suez Advanced Solutions UK deliver innovative methods of water and wastewater management throughout the UK. Working with a wide range of customers in the industrial and utility sectors, SUEZ Advanced Solutions UK are focussed on tailored and integrated process solutions for measurable results. Suez Advanced Solutions UK’s suite of environmental technologies and services deliver optimised methods of water network management for the water sector. Utilising a wealth and depth of experience in water and sewerage networks, a wide range of pioneering and innovative process solutions are now successfully providing commercial benefits to water companies, and improving service quality for the end user. Our industrial water specialists deliver bespoke solutions based on the specific needs and process requirements of the customer, to provide reduced costs, energy and water consumption. Committed to continuous development through technical innovation, Suez Advanced Solutions UK transfer knowledge and expertise from a diverse range of industrial sectors, offering a comprehensive understanding of processes and relevant environmental and industry legislations.

    Asset Maintenance & Rehabilitation
    Asset Management
    AJ Engineering & Construction Services Ltd logo

    AJ Engineering & Construction Services Ltd

    United Kingdom

    AJ Engineering & Construction Services Ltd provide a wide spectrum of engineering services ranging from steel fabrication and CNC machining to cladding and civil engineering, with our highly experienced team we provide on-time, on-budget quality solutions. From our bases in Forres and Fort William, and a team accustomed to travel we can meet our client’s needs wherever required. Having worked on various water and wastewater treatment projects for the past 25 years we have developed a great working relationship with water companies across the UK. Our in-house capabilities allow us to offer a turnkey service to our clients from reactive maintenance and manufacturing to planned infrastructure and non-infrastructure projects. Many of the projects we undertake in the water sector are within water treatment and wastewater treatment plants where cleanliness is paramount, all our water sector site teams hold certification and Water Hygiene cards. Our range of services collated into one means that we can take on multiple discipline contracts and deliver them as one which provides our clients with a number of advantages. It removes the need to have multiple contractors on site at once. Benefits in cost savings passed down on procuring large amounts of steel for a side wide project. Little risk of dimensional discrepancies between contractors We work alongside framework delivery partners throughout the UK providing the services below; Steel portal frame buildings (design, fabrication, erection & cladding) Design, manufacture and installation of pipe bridges Design, manufacture and installation of site wide access metalwork (walkways, access stairs, ladders etc) Design, manufacture and installation of modular water buildings transportable by road. Design of various process tanks, pipework and pumps. Fabrication of tanks and pipework (stainless and carbon) Mechanical Installation Modular Treatment Buildings and Mechanical Fit-out SR2 rated steel enclosures (quicker than GRP Kiosks) We appreciate how important quality and cleanliness is in the water sector and we are proud that we have completely segregated facilities for stainless steel and carbon steel. In addition to this we are also approved under the regulations 31(4)(A) of the water supply regulations 2016 to supply stainless steel and pipework fabrications to the drinking water sector.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Cadman Cranes Ltd logo

    Cadman Cranes Ltd

    United Kingdom

    Cadman Cranes is a leading provider of lifting solutions in the UK with over 50 years’ experience and a reputation for quality, reliability and safety. At the very forefront of sustainability within the industry, Cadman Cranes offer responsible and collaborative turn-key solutions across all industries. From depots in Colchester and Brentwood, Cadman is ideally positioned to cover the East of England and beyond, living and breathing its mission to provide safe lifting solutions to industry and communities in a collaborate, considerate and sustainable way. Cadman has always placed great importance on delivering so much more than just crane hire. Its values are focussed on the success of its clients, its people and its community, and it takes great pride in going the extra mile on every job, no matter how big or small. Cadman Cranes add value to your hard work and offer a full-service lifting solution that goes far beyond just crane hire. It doesn’t just look for customers, it looks for partnerships based on trust, quality and safety. Services include: Contract lift services: Our complete package service is ideal for those who require a fully managed lifting solution, removing your risk and liability, and ensuring that we deal with all of the ‘heavy lifting’. Crane hire services: Cadman Cranes is the leading crane rental company in the East of England, providing crane hire across London, Essex, East Anglia, and all over the UK. With cranes available 24/7, 365 days a year, we are well positioned to keep your operations moving. Tank clearance, dredging, and grab solutions: Cadman Cranes offers innovative tank clearance solutions with our custom-designed grab attachment. The remote-controlled grab, mounted to the hooks of our mobile cranes, can reach up to 60 meters and handle a variety of materials, including sewage waste, sludge, grit, mud, and sand. This service is ideal for wastewater treatment plants, sewage facilities, digester tanks, aeration tanks, ports, and any industrial sites that require regular tank cleaning, maintenance, or dredging. Specialist lifting equipment for utility installation projects: Utilising our range of specialist lifting equipment, we have assisted on some of the most complex utility installation projects throughout the East of England, solving problems currently unimaginable by other mobile crane hire companies. Our innovative Compact Crawler Cranes, in combination with our remote-controlled telescopic hydraulic grab, have proved invaluable in providing the highest level of service and crane hire to the utilities sector. If you would like to work with Cadman Cranes or are looking to add a safe and considerate crane hire solution to your list of approved suppliers, Cadman would love to hear from you.

    Asset Maintenance & Rehabilitation
    Hayes GFS Ltd logo

    Hayes GFS Ltd

    United Kingdom

    Hayes GFS Ltd are recognised throughout the water industry as experts in the supply, installation and refurbishment of glass-fused-to-steel tanks, epoxy coated tanks and stainless steel tanks, from anaerobic digesters to potable water storage solutions to Nerada tanks. Our experience as framework suppliers to many UK water companies and having worked on projects throughout the Europe, America and the Middle East, has given us an unprecedented insight into the needs and demands of a variety of distinguished clients. Services include: The supply and installation of Permastore glass-fused-to-steel tanks and silos, fusion bonded epoxy, stainless steel tanks and GRP roofs. On-site tank surveys and condition reports. Emergency repairs. Refurbishment and replacement of existing tanks and roofs. Design, manufacture, supply and retrospective fitting of all tank related ancillaries, including access steelwork, decant pipework, tank Insulation and cladding.

    Project Planning & Surveying
    Asset Maintenance & Rehabilitation
    AVK UK Ltd logo

    AVK UK Ltd

    United Kingdom

    AVK UK is part of the globally renowned AVK Group who are based in over 100+ countries and has over 4,500+ employees worldwide. The AVK Group is privately owned by the founder Niels Aage Kjaer, and is named after his father Aage Valdemar Kjaer. As part of the AVK Group, we pride ourselves in being one of the leading valve manufacturers for the water, sewage, firefighting, and gas industries. Our product program comprises a large range of valves, hydrants, pipe fittings and accessories, each complying with the highest standards of safety and durability. Our focus is on the products designed and manufactured to the British Standards, however, the AVK Group today offers products in accordance with the most national and international standards. Our product portfolio also includes AVK Smart Water Management valves and sensors for real-time network information and status. We also offer Pressure Management solutions such as air valves, PRVs, and control valves, AVK Assist which enables GPS product location and, the market leading Donkin PUR range of gas valves. Our UK sales offices and manufacturing sites respond quickly to the needs of our customers and for fittings required on an express or emergency service we have a dedicated same day 24/7 helpline – 0800 202 8228. In addition, we cooperate with local and national distributor partners to offer our customers AVK products as part of multi-product packages. AVK UK is the sales division and has offices in Staveley, near Chesterfield, also known as the home of Bryan Donkin gas valves, and Northampton. AVK in the UK comprises of 7 companies and has over 500 employees. Find out more here: https://www.avkuk.co.uk/en-gb/solutions-and-information/about/avk-in-the-uk/avk-uk

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    Environmental Techniques Ltd logo

    Environmental Techniques Ltd

    United Kingdom

    Environmental Techniques was established in 1992 to provide trenchless drainage inspection, cleaning and rehabilitation throughout the United Kingdom and Ireland, with offices in Northern Ireland, Scotland and the Isle of Man. Our fleet of inspection vehicles provide surveying services for wastewater network assets including CCTV surveys, sonar surveys, manhole mondition and dimensional surveys, dye tests and impermeable area surveys. Our jetting rigs provide cleaning, unblocking and degreasing of sewers and culverts. We also provide services for pipeline rehabilitation including CIPP lining, localised patch repairs and GRP lining. In 2017 Environmental Techniques became part of the Aegion Corporation which recently in 2024 rebranded as Azuria Water Solutions. As part of Azuria Water Solutions, Environmental Techniques have further developed their technical capabilities through the use of carbon fibre reinforced polymers and drone survey technology. Environmental Techniques continue to push the boundaries of CCTV surveys and investigation through the use of drone and LiDAR technology. Environmental Techniques work closely with clients to understand the needs in advance of carrying any work out. With close liaison and good communication, Environmental Techniques are able to provide savings and benefits to clients on a regular basis. Specialising in: Sewer cleaning & desilting CCTV surveys Flow monitoring & IAS surveys CIPP lining Robotic cutting CFRP Manhole surveys Man entry surveys Patch repairs Manhole rehabilitation Man entry pipe & culvert rehabilitation

    Mapping & Modelling
    Asset Maintenance & Rehabilitation
    Eliquo Hydrok Ltd logo

    Eliquo Hydrok Ltd

    United Kingdom

    ELIQUO HYDROK works with all major UK and Ireland water companies, providing practical water engineering solutions. As a specialist engineering firm with head office in Indian Queens, ELIQUO HYDROK operates at the forefront of innovative and sustainable water treatment technologies. We support the entire UK water sector, supplying every water company. Part of ELIQUO WATER GROUP, the extensive portfolio includes solutions for wastewater management, wastewater treatment, clean water treatment and surface water management; Mecana PCMF, aeration technologies, CSO screens, flow controls, storm tank flushing and Raw Water Intake Screens. Plus, a sludge treatment portfolio that helps reduce costs, improve efficiency, and meet environmental compliance requirements – through systems like ELOVAC® for vacuum degassing, and other integrated technologies in biogas, digestion, dewatering and drying. With established teams in Cornwall, Wolverhampton and Wombwell, ELIQUO HYDROK are well-equipped to support operations – from start to finish; with design, manufacture, management and install capabilities – across the UK and Ireland. This wealth of in-house expertise is backed by a forward-thinking mindset to help customers achieve their long-term goals sustainably; to deliver results in AMP 8 and beyond.

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    Steve Vick International Ltd logo

    Steve Vick International Ltd

    United Kingdom

    Steve Vick International (SVI) is dedicated to delivering cost-saving solutions for damaged, redundant or outdated underground pipework. Since its foundation in 1981, SVI has been at the forefront in developing products and techniques for the repair, renovation and decommissioning of pipes. Predominantly our work has been in the gas industry but increasingly we are undertaking projects in the water and nuclear sectors. We are the UK’s leading producer of Pipe Coil Trailers and offer a range of Pipe Handling equipment such as Handlers, Crackers and Cutters. Some of our latest innovations include the PE Pipe Cutter, the Pipe Feeder for Pre-Insulated coiled pipe, PE Live Head for Live Mains Insertion, the Perpetual Pipe Pusher, FBOS (Foambag Operation on Stubs) and SMARTester. WATER: For over 20 years water utilities and their contractors in the UK and overseas have used our pipe handling equipment to improve their efficiency and safety. Today our products include Pipe Handlers, Pipe Coil Trailers and Pipe Cutters as well as our patented DRAINBLOCK™ and RATBLOCK™ sealing systems. GAS: In the UK we are major suppliers to all the gas distribution networks. Many of the techniques we have pioneered have become the preferred methods of working in the industry and our resin foam sealant products and associated equipment are key to many of the cost-saving renovation processes used. NUCLEAR: SVI offer solutions to the problems associated with decommissioning and sealing disused pipework, ducts, sleeves and ventilation shafts. Our technology can also be designed for the mass filling of large and complex voids and is a lightweight alternative to cement grout. We have worked at Hinkley, Sellafield, Harwell, Chapelcross and Hunterston. CONTRACT SERVICES: A rapidly expanding part of our business is our Contract Service department who are well known for their work in the field of renewing and repairing underground gas pipes, for the UK Gas Distribution Networks. However, they are becoming increasingly involved in projects being undertaken by water utilities, electricity providers, rail networks, civil engineers, construction companies and local councils. This reflects the range of skills and expertise available to solve on-site problems associated with pipe repair, renovation, and diversion. Located strategically around the UK the highly skilled team can provide a fast response, emergency repairs and a rapid call out service which is offered 24 hours a day, 7 days a week. HIRE: We offer specialist plant and equipment for the Utilities Industries. Products available for hire include our Pipe Handlers, Perpetual Pipe Pusher, Pipe Coil Trailers, Rapid Rotary Cutters, Rapid Window Cutters, MACAW Pipe Crackers, CRACKERJACK and Mini Purge. All our hire equipment comes with onsite support from our highly experienced engineers and our products are fully maintained and serviced at our depots. All equipment is also available to purchase. SMARTester: SMARTester is the wireless pressure test system, that ensures absolute traceability and best practice. The system combines: SMARTester pressure sensor, an intuitive App and a Dashboard database of test evidence. Together the 3 components work to give you confidence that your tests are highly accurate, fully compliant and that evidence is traceable.

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    Concrete Repairs Ltd logo

    Concrete Repairs Ltd

    United Kingdom

    Concrete Repairs Limited (CRL) is a specialist asset maintenance contractor who is here to help you with the inspection, repair & refurbishment of your concrete water assets. CRL provide comprehensive repair and refurbishment services tailored to the needs of the water and wastewater sector throughout the UK. These include the inspection, repair, refurbishment and upgrading of service reservoirs, contact tanks, water towers & wastewater treatment plants. With over 65 years of experience, CRL understands the importance of maintaining water quality and supply to customers. Therefore, when planning repairs, we prioritise effective programming of the work and optimal utilization of the assets being repaired. Our choice of repair methodologies and materials always reflects this commitment. At CRL, we pride ourselves on being a reliable partner to the water companies. We collaborate closely with them to identify problems early, quantify the necessary repairs, and establish a timeline for refurbishment. Throughout this process, we focus on ensuring the longevity and optimal performance of the assets. CRL provide proven and successful cost-effective repair and refurbishment options which meet our clients’ objectives of upgrading and increasing the life of their structures. CRL is capable of undertaking individual projects of up to £20M, either under competitive tender, or through Partnering/Framework arrangements. Our broad experience across various sectors ensures we deliver efficient, robust, and technically advanced services.

    Asset Maintenance & Rehabilitation
    Sewer Inspections
    R2M Limited logo

    R2M Limited

    United Kingdom

    At R2M, we are driven by a passion for creating innovative solutions that help build a smarter, more resilient water industry. Our mission is to deliver effective, high-quality products and services to UK water utilities and contractors, continually striving to enhance the nation's water supply for future generations. Founded in 2003 as a supplier of pipes and fittings, R2M quickly earned a reputation for reliability through our extensive product range and robust stock levels—ensuring our customers always had what they needed, when they needed it. Over the years, we have evolved from a trusted supplier into a comprehensive manufacturer and installer too. Today, we offer end-to-end solutions—all under one roof—streamlining the process for our customers and providing exceptional value at every stage. We are proud to be used trusted by all water utilities and contractors across the UK. Since 2019, R2M has proudly been a member of the Hawle Austria Group—a global network of like-minded, quality-focused companies including the likes of Hawle Austria, Erhard, Nova Siria, and Özkan. This partnership gives us exclusive access to a wide portfolio of innovative and proven products from across the group, allowing us to offer tailored solutions that meet the evolving needs of our customers. Being a part of this established and experienced group strengthens our capabilities, expands our product range, and ensures we stay at the forefront of the industry—so our customers always benefit from world-class technologies backed by local expertise. Are you ready to discover how our solutions can support your next project? Get in touch with us today on 01282 778 030.

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    Total Automation & Power logo

    Total Automation & Power

    United Kingdom

    Total Automation & Power (TAP) is a formal joint venture between Cougar Automation Ltd and Technical Control Systems Ltd. Formed in 2005, it has delivered hundreds of projects worth tens of millions of pounds. Current water and wastewater frameworks include Severn Trent, Thames, Welsh & Yorkshire Water. Working with TAP is just like working with a single company. Every project has a dedicated project manager who coordinates all the work and gives you a single point of contact. You place a single order for all of your electrical and control system design, supply and installation so you can concentrate on delivering your project without having to worry about placing and managing separate orders for MCCs, a control system and electrical installation. Unlike separate orders, both companies stand behind the whole scope and unlike a contract/sub-contract arrangement we don’t mark up each other’s price. Projects are easy to manage, secure and competitively priced. Supporting clients from initial concept design stage through to on-site commissioning, TAP collaborates with clients at every stage to evaluate designs to optimise TOTEX outcomes. When you choose TAP as your partner you get an unrivalled combination of expertise: Control System, SCADA & PLC expertise from Cougar Automation in six regional offices throughout the UK. MCC, low voltage assembly and panel expertise from Technical Control Systems’ manufacturing facility in Leeds.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Siltbuster Group logo

    Siltbuster Group

    United Kingdom

    Established for over 20 years, the Siltbuster Limited provides rapidly deployable, “modular off the shelf” water treatment solutions to the construction, industrial and municipal markets, with a client base ranging from the world’s most recognisable multi-national corporations to small enterprises. Siltbuster provides a wide range of water and wastewater treatment equipment for the industrial and municipal markets, including: Packaged lamella dissolved air flotation (DAF) units. Lamella clarifiers. Packaged biological treatment systems. Oil/water separators. Pipe flocculators. Reaction tanks. Containerised dosing systems. In the UK, Siltbuster has pioneered the concept of offering this plant through our extensive hire fleet. Approximately 20 major contracts and circa 50 smaller projects are undertaken each year for a diverse range of clients, many of which are some of the UK’s best-known companies. In addition to the industrial/municipal sector, Siltbuster has undertaken a number of mine water treatment projects in many countries, for example, the UK, Ireland, Greece, France, USA, Canada, Australia and Slovakia. The Siltbuster team pride themselves in their ability to react rapidly and in compliance with the project constraints, delivering mobile or permanent solutions tailored to meet your individual needs.

    Treatment Process Technologies
    Asset Maintenance & Rehabilitation
    Stonbury logo

    Stonbury

    United Kingdom

    Stonbury is an agile, direct delivery specialist contractor to both the water industry and wider water environment, with an emphasis on delivering innovative, low carbon and high-quality reliable solutions. Currently holding over 30 Frameworks, we work with most of the UK’s water companies and the EA – either directly or through their major supply chains – to deliver high value, low carbon solutions across their asset estates. This includes works on potable water, wastewater treatment centres and nature-based ‘green’ and ‘grey’ solutions that deliver smart, low carbon environmental engineering. In recognition of the intensified global focus on the effects of carbon emissions and their impact on the climate and biodiversity we have reassessed our Purpose, Vision and Strategic Goals, putting sustainability at the heart of our culture and everything we do.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Anglian Water’s @one Alliance logo

    Anglian Water’s @one Alliance

    United Kingdom

    Anglian Water's Integrated Main Works Delivery Programme Anglian Water’s @one Alliance is an integral part of the Anglian Water ecosystem, delivering complex projects across the Water and Water Recycling network. Comprising 8 industry-leading organisations, each contributing specialised expertise, @one efficiently manages over 40% of Anglian Water’s capital delivery programme. Our partners are Anglian Water Asset Delivery, Balfour Beatty, Barhale, Binnies, Mott MacDonald Bentley (MMB), Sweco, Skanska and MWH Treatment. Employees in the @one Alliance are employed across all our partner companies and work together to deliver complex programmes of work. Following the successful delivery of £1.2bn during AMP7, the @one Alliance is now set to deliver approximately £3bn of vital work as part of Anglian Water’s £11bn AMP8 business plan, covering around 750 projects over the next five years. Since our establishment in 2005, @one has grown to a team of over 1,600 employees. And with plans to welcome an additional 300-500 new team members over the next 12-18 months, the Alliance is set to expand even further. If this interests you, then take a look at our jobs page to see the options available to you!

    Networks - Water Supply
    Asset Maintenance & Rehabilitation

    Manhole Rehabilitation Methods: Structural Lining, Chemical Grouting, and Frame Replacement

    Manhole rehabilitation addresses structural deterioration (cracking, spalling concrete, corroded brickwork), infiltration of groundwater through joints and walls, and exfiltration of sewage to groundwater. Deterioration mechanisms include: microbially induced corrosion (MIC) where H2S gas generated in anoxic sewers reacts with surface moisture and oxidises to sulphuric acid (pH below 2 at crown), dissolving calcium silicate hydrate in concrete at rates of 1 to 10 mm per year in aggressive systems; hydrostatic groundwater pressure causing joint opening and cracking; and freeze-thaw cycling in cold climates causing spalling. Manholes with concrete crowns at or below the sewer water table are at highest MIC risk.

    Rehabilitation methods by deterioration type: structural repair by spray-applied cementitious liner (minimum 10 mm, alkalinity-resistant, epoxy-modified mortar achieving pH 13 to resist ongoing MIC) for MIC-damaged concrete; polyurea or polyurethane spray lining (1 to 5 mm, 100 percent solids) for watertight membrane against infiltration; chemical grouting (polyurethane grout, expanded in situ at cracks and joints) to stop active infiltration before structural lining; and full fibre-reinforced plastic (FRP) liner insertion for severely deteriorated manholes requiring structural replacement without excavation. Frame and cover replacement addresses surface level adjustment (raising by frame extension rings) and load-bearing capacity (upgrade to D400 or E600 class covers per EN 124).

    Post-rehabilitation testing: vacuum test (EN 1610 acceptance test, apply -0.1 bar vacuum for 5 minutes, pressure rise below 0.025 bar indicates acceptable leak tightness) for new or rehabilitated manholes. CCTV inspection inside the manhole after rehabilitation verifies lining coverage, joint treatment, and absence of voids. Cost comparison: spray cementitious lining of 1.8 m diameter manhole 3 m deep: $800 to $2,000; polyurea lining: $1,200 to $3,000; full FRP liner: $3,000 to $8,000; open excavation and replacement: $10,000 to $30,000. Trenchless rehabilitation is preferred in trafficked roads where excavation cost and traffic management cost would multiply total project cost by 3 to 5 times.

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    Frequently Asked Questions

    What causes manholes to deteriorate?

    Three primary deterioration mechanisms affect manholes. First, microbially induced corrosion (MIC): anaerobic bacteria in sewers produce hydrogen sulphide (H2S) gas, which oxidises to sulphuric acid at the damp crown and walls above the waterline by Thiobacillus bacteria, attacking concrete (pH below 2 at the surface). Concrete loss rates of 1 to 10 mm per year occur in severe cases. Second, groundwater infiltration: hydraulic pressure forces water through cracked joints and walls, which erodes mortar joints (particularly in brick manholes) and washes fine particles into the sewer (I&I - infiltration and inflow). Third, traffic loading: heavy vehicle loading causes settlement of manhole frames, cracking of cone sections, and joint displacement, exacerbated by differential settlement in fill material around the manhole.

    What is the difference between grouting and lining a manhole?

    Grouting addresses active water infiltration: polyurethane or polyacrylate grout is injected under pressure through drilled holes into cracks, joints, and the surrounding soil annulus. The grout expands on contact with water, filling voids and forming a watertight plug. Grouting is a pre-treatment step to stop active water ingress before applying a structural liner; grouting a still-wet surface is practical, whereas lining requires a relatively dry surface. Lining applies a structural layer to the interior of the manhole to restore structural integrity, smooth the surface, and provide a corrosion-resistant barrier. Cementitious liners (spray-applied, 10 to 25 mm) resist ongoing H2S attack by high alkalinity. Polyurea liners (1 to 5 mm spray) are impermeable membranes used primarily for watertightness rather than structural repair. The two are often used together: grout first, then line.

    How long does manhole rehabilitation last?

    Service life of rehabilitated manholes depends on the method and ongoing exposure. Spray cementitious mortar lining in a moderately corrosive sewer (H2S below 200 ppm): 20 to 30 years. High-build epoxy lining (3 to 5 mm): 15 to 25 years in moderate corrosion. Polyurea spray lining (flexible, crack-bridging): 25 to 40 years if UV-protected (polyurea degrades under UV if not topcoated with polyurethane UV coat, relevant for manholes with open covers). Full FRP liner (factory-manufactured, installed as one-piece or assembled ring section): 50-plus years. Open-cut replacement with precast concrete manhole: 50 to 80 years. Longevity is heavily dependent on the ongoing corrosion environment; any rehabilitation in a high-H2S system (above 500 ppm H2S in sewer atmosphere) will fail more rapidly without ongoing gas control at source (ventilation, dosing of nitrate or iron salts to suppress H2S generation).

    How are manholes inspected before rehabilitation?

    Pre-rehabilitation condition assessment uses: (1) Visual inspection by entry (where safe) or CCTV camera mounted on a mast lowered into the manhole - identifies cracking, spalling, joint defects, active infiltration points, and MIC damage zone extent; (2) Hammer-sounding of concrete to identify delamination and hollow sections (hollow sound indicates debonded material at risk of fall); (3) Concrete carbonation test (phenolphthalein indicator spray - uncarbonated concrete pH above 10 stays pink, carbonated zone pH below 8 stays colourless); (4) H2S gas measurement (4-gas meter before entry for health and safety, and continuous monitoring during inspection; H2S above 10 ppm requires SCBA or forced ventilation); (5) Dimensional survey for frame level, cone geometry, and liner thickness estimation. Inspection results are used to specify the appropriate rehabilitation method and material quantities.

    Case Study·Urban sewerage infrastructure
    Challenge

    A UK sewerage undertaker in the North West of England identified 240 manholes on a main interceptor sewer route as having severe microbially induced corrosion, with concrete loss rates of 5 to 8 mm per year at the crown. Seven manholes had collapsed crown sections, and the route passed under a major arterial road. Open excavation and replacement would have caused estimated 14 million GBP in traffic disruption costs over 3 years.

    Approach

    Classified manholes into three condition bands by CCTV inspection and hammer-sounding. Band A (18 manholes, collapsed crown): emergency polyurea spray lining plus GRP structural ring insert. Band B (82 manholes, severe MIC but structurally sound): spray-applied sulphate-resistant cementitious mortar (15 mm, pH 13) with polyurethane grout at active infiltration joints. Band C (140 manholes, moderate MIC): spray-applied cementitious mortar (10 mm) only. All works completed using confined space teams without road closure, using CCTV verification of lining coverage post-completion.

    Outcome

    All 240 manholes rehabilitated within 18 months at a programme cost of 3.8 million GBP versus 18 million GBP estimated for open excavation and replacement. Post-rehabilitation CCTV showed lining coverage above 98 percent on all Band A and B manholes. Vacuum testing of all rehabilitated manholes confirmed EN 1610 acceptance criteria. Post-rehabilitation Legionella sampling of the groundwater monitoring boreholes adjacent to the sewer route showed no groundwater contamination from sewer exfiltration.

    Questions to Ask Shortlisted Providers

    1. 1

      What pre-rehabilitation inspection scope do you propose, and will each manhole receive individual condition grading before you specify the rehabilitation method?

      Batch-specifying the same rehabilitation method for all manholes in a programme without individual condition grading results in under-treating severely deteriorated manholes (liner fails early) and over-treating lightly damaged manholes (wasted spend). A condition-graded programme with at least three bands (emergency structural, standard structural, and cosmetic) delivers better value. Inspect before specifying: any contractor proposing a rehabilitation method before completing inspection is not following good practice.

    2. 2

      What is the design life of the rehabilitation method for our specific sewer corrosion environment, and what is your evidence for this from installed references?

      Service life claims for spray cementitious liners (20 to 30 years) in moderate H2S environments may reduce to 8 to 12 years in severe environments (above 500 ppm H2S). Ask for references of installations in similar H2S concentrations and evidence of performance after 10-plus years. A contractor who cannot provide references from comparable environments is relying on material data sheet claims that may not reflect real-world performance.

    3. 3

      What is the H2S concentration in our manholes during working hours, and what confined space safety plan do you have for your operatives?

      Under the Confined Spaces Regulations 1997 and HSE guidance, H2S above 1 ppm requires enhanced monitoring; above 10 ppm requires SCBA or forced ventilation; above 20 ppm requires immediate evacuation. Manhole rehabilitation in a high-H2S sewer atmosphere without an appropriate confined space safety plan is a serious HSE offence. Ask for the gas monitoring protocol, PPE specification, and emergency rescue plan for your specific sewer before accepting the contractor's proposal.

    4. 4

      What post-rehabilitation testing regime is included in the scope, and will vacuum testing be performed on every manhole?

      Post-rehabilitation vacuum testing to EN 1610 (pressure decay rate below 0.025 bar per 5 minutes) is the standard acceptance test for rehabilitated manholes where watertightness is the objective. Without post-rehabilitation testing, there is no evidence that active infiltration has been sealed. Some contractors offer visual inspection as a substitute for vacuum testing; this is not adequate for manholes in high groundwater areas where infiltration is a primary driver of the programme.

    5. 5

      How will sludge, debris, and lining material displaced during rehabilitation be captured and disposed of, and what is the waste classification for the spent material?

      Manhole rehabilitation generates waste including removed concrete spall, cleaning debris, and spray material overspray. In manholes on sewers carrying industrial effluent or from combined sewers, this material may contain elevated metals, hydrocarbons, or biological contamination requiring waste characterisation before disposal. A contractor who disposes of manhole rehabilitation waste to standard skip without characterisation may be committing an illegal disposal offence under the Environmental Protection Act 1990.

    What Drives Cost in This Category

    Manhole diameter, depth, and condition band

    Spray cementitious lining of a standard 1.2 m diameter manhole 3 m deep (moderate MIC, Band B): 1,200 to 2,500 GBP per manhole. A 1.8 m diameter deep (6 m) manhole with severe MIC requiring polyurea plus structural GRP ring: 5,000 to 12,000 GBP per manhole. Full open excavation and replacement: 15,000 to 40,000 GBP per manhole depending on depth and road condition. For a 100-manhole programme, the rehabilitation versus replacement cost difference is typically 800,000 to 3,000,000 GBP, justifying significant investment in inspection and rehabilitation planning.

    Traffic management and access constraints

    Manhole rehabilitation without road closure (using CCTV inspection, compact spray equipment, and no major excavation) avoids the largest cost variable on trafficked routes. Lane rental charges under the Traffic Management Act 2004 Section 74 run 2,500 GBP per day beyond the permitted period on principal roads. Emergency access manholes in high-traffic areas may require night-shift working (30 to 50 percent uplift on labour rates) to meet highway authority permit conditions.

    Confined space and H2S management

    In high-H2S sewer environments (above 50 ppm), rehabilitation requires three-person confined space teams with SCBA (one operative working, one standby at surface, one emergency response). This reduces production to 3 to 5 manholes per day versus 6 to 10 manholes per day in low-H2S environments, increasing labour cost by 30 to 60 percent per manhole. H2S gas scrubbing of the manhole atmosphere before entry (using forced ventilation with activated carbon scrubbers) adds 200 to 500 GBP per manhole in equipment cost.

    Post-rehabilitation testing and verification

    Vacuum testing to EN 1610 costs 150 to 350 GBP per manhole. CCTV verification of lining coverage costs 100 to 250 GBP per manhole. For a 100-manhole programme, post-rehabilitation verification adds 25,000 to 60,000 GBP to programme cost. The consequence of omitting verification (liner failure, sewer exfiltration to groundwater, road subsidence) on a principal road can cost 100,000 to 500,000 GBP per event in emergency repair, traffic management, and liability claims.

    Key Regulations & Standards

    Confined Spaces Regulations 1997 -- Entry into Manholes and Sewers

    Manholes and sewers are defined confined spaces under the Confined Spaces Regulations 1997. Entry requires: risk assessment identifying hazards (H2S, methane, oxygen deficiency, engulfment), written safe system of work, trained and competent confined space operatives, gas monitoring before and during entry (4-gas meter: O2, H2S, CH4, CO), standby man at surface, and rescue plan. H2S above 1 ppm triggers enhanced monitoring; above 10 ppm requires SCBA or forced fresh air ventilation. Non-compliance is a serious health and safety offence.

    EN 1610:2015 -- Construction and Testing of Drains and Sewers

    BS EN 1610:2015 is the European standard for construction and testing of drain and sewer systems including manholes. Section 14 specifies acceptance testing for manholes: air test at -0.1 bar gauge pressure, 5-minute hold, pressure rise must not exceed 0.025 bar (indicating leak). EN 1610 is referenced in UK sewerage undertaker asset adoption standards and in CDM 2015 project documentation as the test standard for post-rehabilitation acceptance of manhole watertightness.

    Environmental Protection Act 1990 -- Duty of Care for Manhole Rehabilitation Waste

    Waste produced during manhole rehabilitation (concrete spall, cleaning debris, spray material waste) is subject to the waste duty of care under Environmental Protection Act 1990 Section 34. Contractors must: classify waste correctly (non-hazardous or hazardous depending on sewer type and contamination), use licensed waste carriers for transport, and dispose of waste at licensed sites. Transfer notes must be retained for 2 years. Incorrect waste classification and disposal to an unlicensed site is an offence punishable by unlimited fines.

    Water Industry Act 1991 -- Sewerage Undertaker Duties and Asset Standards

    Water Industry Act 1991 Section 94 requires sewerage undertakers to maintain an effective system of public sewers and to have the sewers cleaned and emptied. Collapsed or severely deteriorated manholes that cause surcharging, customer flooding, or groundwater contamination represent a breach of the Section 94 duty. Ofwat's reporting requirements include sewer flooding incidents attributed to sewer and manhole condition, incentivising proactive rehabilitation programmes to avoid ODI penalties and Section 18 enforcement action.

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