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Manhole Linings

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Manhole Linings

Chemical Resistant Linings

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Total Specialist Maintenance Ltd (TSM) is a leading specialist contractor Driven to exceed expectation!

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Manhole Linings

Total Specialist Maintenance (TSM) is a specialised contractor dedicated to manhole lining solutions, offering refurbishment and preventative enhancement services for both existing and newly constructed concrete and brickwork manhole and chamber structures. We provide our manhole lining services nationally across a wide range of market sectors.

At TSM, we implement various chemical-resistant lining systems, including hybrid silicate lining systems and sulfate-resistant cementitious render systems. These solutions create a seamless, chemical-resistant waterproof coating, effectively protecting brick and concrete manholes, wet wells, and pumping chambers from degradation.

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Manholes are classified as confined spaces and can be particularly vulnerable to neglect over time, as well as severe chemical attacks, especially from hydrogen sulfide gas prevalent in the water and petrochemical industries. Other sectors, such as the dairy industry, face challenges from lactic acid buildup, while manufacturers of alcoholic beverages and soft drinks contend with high sugar and citric acid content that can degrade manhole structures. Additionally, the cleaning processes in various manufacturing industries often involve the use of acidic and alkaline solutions, which can further compromise the integrity of manholes as they flow through effluent drainage systems.

By addressing these issues with our advanced lining solutions, TSM ensures that manhole structures are adequately protected, enhancing their durability and functionality while preventing costly damages and environmental impacts.

Problems that lead to manhole lining

Low flow rates

– These can lead to large amounts of gas being formed.

Stagnant water

– can be the catalyst for chemical reactions between water and oxygen.

Hydrogen sulphide gas (H2S)

– Problems can arise from odour and corrosion

Acid and Alkaline chemical attack

– Problems occur due to the degradation of the substrate.

Manholes that have suffered from years of neglect and chemical attacks can be completely refurbished with a high-quality lining at a fraction of the cost, avoiding the inconvenience of replacing the whole manhole chamber.

All of our Operatives are familiar with the risks of confined spaces in contact with wastewater and are breathing apparatus (BA) trained with the appropriate safety practices providing a safe manhole lining refurbishment service.

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What to expect from manhole lining

On completion, the manhole lining will be:

  • Leak tight from manhole water infiltration

  • Chemically resistant to degradation

  • Smooth to avoid trapping debris that causes recurring blockages within the system.

What we excel in

  • Hydrogen sulphide gas (H2S) resistant manhole liners

  • Coatings resistant to a range of trade effluent

  • Structural rebuilds of defective manholes and lining systems

  • Leakage resistant & water infiltration solutions

  • Environmentally-friendly solutions

Sectors

Benefits

Directly Employed Workforce

Highly Skilled and Experienced Operatives

Certified Training

Accreditations

Accreditations: CHAS
Accreditations: SMAS Safety Management Advisory Services
Accreditations: Safe Contractor
Accreditations: Constructionline
Accreditations: Builders Profile

Frequently
Ask Questions

Technical Questions About
Manhole Lining

Frequently asked questions about Total Specialist Maintenance Manhole lining for domestic, highways, water industry and food and drink industry technical queries regarding Manhole lining

For any additional information that is not listed please contact our technical team

Structural rehabilitation & protective coatings provide a cost effective, permanent seal against corrosion, infiltration and exfiltration – in less time than it would take to replace your structures

Silicate hybrid system

Often specified for manhole rehab projects, the system is also terrific for lining newly installed structures when high head pressure or high H2S is anticipated. The system’s primary technology is a high-build, silicate hybrid system. The system is often used where existing structures have been subjected to H2S gas attack and the cement compound has been eroded leading to the requirement for a full structural refurbishment using R4 concrete repair mortars.

Older manholes were made from engineering and vitrified brick that have excellent resistance to chemicals and in particular sulphuric acid, formed from the H2S gas generated by microbiological activity in sewage. These bricks were excellent when first used in the construction of manholes. Unfortunately, the cement mortar mix used to bond the bricks together has poor resistance to H2S and chemical attacks, the mortar joints are attacked by the chemicals and any H2S gas generated and the mortar can be significantly reduced its strength and consequently affect the bonding of the bricks and the structural integrity of the manhole.

Similarly, chemical and H2S attacks on unprotected concrete manholes react in the same way, attacking the cement in the concrete and reducing its strength, dissolving the bond between the aggregate, sand and cement mix resulting in eroding the surface and exposing rebar in some extreme cases.

The symptoms of this type of damage to manholes are displayed as infiltration issues (through brick joints, concrete ring joints, penetrations) causing overcharging of the downstream treatment plants, exfiltration leading to pollution and environmental issues, structural failure, damage or complete destruction to the concrete benching and pipe connections, wash out of backfill and surrounding ground subsidence.

Our silicate lining system performs well on both concrete and brick manholes

Our silicate lining System is equally well suited to the protective lining of new structures and the rehabilitation of older structures.

Because our silicate lining system is moisture tolerant, the manhole can be returned to service immediately after the product is cured. For exact cure times refer to our technical data sheet for our silicate lining system

Our silicate lining system can be used for the rings. It is designed to provide a seal at the grade-adjustment ring sections of manholes and the catch pits

Total specialist maintenance manhole lining system also involves structural repair where required which involves the removal of defective concrete the substrate is then mechanically prepared using grit blasting techniques and then the manhole is rebuilt using an R4 concrete repair mortar.

Simply coat the walls around the steps. It is recommended that the steps be covered during the coating process to keep them clean and free of our system