Leaking Water Tank Reline London

Leaking Water Tank Reline at a School in London

Project Brief

A private school in London contacted Titan Water regarding a leaking GRP sectional cold water storage tank located outdoors on site. The tank, positioned on elevated ground within a wooded area, serves the school’s facilities and plays a critical role in maintaining reliable water supply.

The asset comprised a split compartment tank, with each compartment measuring approximately 8m x 2m x 2m. Multiple external leaks had developed, and internal inspection identified deteriorating seals and jointing materials. Given the age of the tank and the extent of the leaks, there was a clear risk of further structural deterioration, potential water quality concerns, and ongoing water loss. A full replacement would have been costly and logistically challenging due to the tank’s location.

A long term, WRAS compliant relining solution was identified as the most cost effective and practical option to restore integrity and extend the service life of the tank.

Solution

To deliver a watertight and compliant result while maintaining supply to the school, we implemented a carefully phased relining project:

Phased Working to Maintain Supply: The tank was split into two compartments. Each section was relined sequentially, allowing one side to remain operational at all times, ensuring uninterrupted water service to the school.

Surface Preparation: All accessible bolts were checked and tightened, and existing mastic joints were assessed and repaired where required. Internal surfaces were mechanically abraded to achieve a surface profile of approximately 75 microns, ensuring optimal adhesion of the new coating system.

Environmental Controls: Due to the tank’s outdoor location, environmental conditions were carefully monitored. Dehumidification and heating equipment were deployed where required to achieve correct curing conditions.

WRAS Approved Polyurethane Application: A solvent free, WRAS approved polyurethane coating was applied in three stages: Stripe coat to all joints, bolts and critical detailing areas, followed by two full roller applied coats to achieve a minimum 700 micron coating thickness across all internal surface. Joints and high risk areas received increased protection up to 1,000 microns.

Recommissioning and Disinfection: Upon completion, each compartment was refilled and disinfected in accordance with PD855468:2015 before being returned to service. A full completion report and disinfection certification were issued to the client.

Key Benefits Delivered

Full restoration of tank integrity: All external leaks were eliminated, and deteriorating internal seals were encapsulated within a seamless, flexible membrane.

10-year guarantee: The WRAS approved polyurethane coating provides long term corrosion resistance and flexibility to accommodate structural movement.

Maintained operational continuity: By relining one compartment at a time, the school experienced no interruption to its water supply.

Cost effective alternative to replacement: Relining avoided the significant cost and disruption associated with full tank replacement, particularly given the tank’s external hillside location.

Improved compliance and future maintenance: The seamless internal finish enhances hygiene standards and simplifies future inspection and cleaning procedures.

Scroll down to view the gallery and see the reline process from start to finish.

Facing issues with leaking tanks in hard-to-reach areas? Learn more about our water tank relining services page and see how we can help extend the life of your assets.

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