Pipefreezing Services
for the Water & Waste Water Sector
Specialist pipeline isolation for water companies, framework contractors, and infrastructure teams
Water and waste water infrastructure operates continuously. Treatment works, pumping stations, and distribution networks run around the clock to meet regulatory commitments and maintain supply. When maintenance or repairs are needed, a full system drain down is rarely viable. The cost, disruption, and regulatory implications of interrupting supply make it a last resort.
APS works alongside water utilities and their framework contractors to carry out pipeline isolation, intervention, and modification work on live systems. Our non-intrusive pipefreezing methods allow pressurised pipework to be isolated, repaired, or extended without interrupting supply or triggering costly shutdowns.
Common Challenges
in Water and Waste Water Infrastructure
Water and waste water infrastructure presents a specific set of constraints that standard maintenance approaches cannot always accommodate:
Planned shutdowns are rarely viable:
Shutdowns on distribution and treatment systems require advance coordination with network operators, regulatory notification, and downstream mitigation. In many cases they cannot be accommodated within project timescales at all. Pipefreezing removes that constraint by creating a reliable temporary isolation point within the live pipe itself, with no upstream shutdown required.
Ageing infrastructure with no working isolation points:
Much of the UK’s water network lacks workable isolation points between the intervention location and a service reservoir or trunk main. Existing valves are frequently seized, degraded, or absent altogether. APS regularly works in exactly these conditions, providing an isolation solution where no conventional alternative exists.
Water quality compliance:
Potable water systems demand methods that are demonstrably safe for water quality at every stage. Our techniques are selected and applied with this requirement front and centre.
Confined space working:
Pumping stations and valve chambers frequently involve restricted access, limited headroom, and confined space protocols. Our engineers are experienced in both and work within the safety and environmental requirements of water sector sites as standard.
Our Solutions
Pipe Freezing
By applying liquid nitrogen to the exterior of the pipe, we draw heat from the product within until it forms a solid internal ice plug; a reliable isolation point capable of withstanding significant differential pressure.
- Isolate, repair, or extend pipework without draining the system
- Effective where isolation valves are unreliable or absent
- No damage to the pipe and no bulk fluid transfer required
- Proven across water mains, sewer rising mains, and treatment works process pipework
Hot Tapping
Hot tapping allows new connections to be made to pressurised, flowing pipework without interrupting supply.
- Create new branch connections, meter insertions, or additional isolation valves live
- No requirement to shut down the main or arrange temporary supply
- Practical and commercially sound on trunk mains and distribution pipework where planned interruptions require significant coordination
Line Stopping
Where a section of network needs to be taken out of service for modification or diversion, line stopping safely stops flow within a pressurised main without shutting down the broader system.
- Take sections offline for modification or diversion without a wider shutdown
- Well suited to AMP-funded infrastructure programmes
- Gives construction teams a dry section to work on while the rest of the network continues to operate
Pipeline Services
APS also provides broader pipework support across water and waste water sites.
- Valve and pump set replacement
- Pipework alterations and reactive maintenance
- Full health, safety, and environmental compliance throughout
- Complete documentation on every job
Testimonials
Here are some of the nice things our clients say about our services.
Where We Work
APS operates across the full range of water and waste water environments. We have an established track record of working within framework contracting structures and understand the programme pressures, documentation requirements, and communication protocols that utilities and Tier 1 contractors expect.
Treatment Works
Valve replacements and pipework modifications carried out without disrupting the treatment process or water quality compliance.
Pumping Stations
Work on pressurised suction and delivery pipework without taking the station out of service, including confined space environments.
Distribution and Trunk Mains
Sections isolated for repair or valve insertion while supply continues flowing downstream.
Sewage Networks
Rising mains, storm overflows, and treatment inlet pipework maintained to the environmental standards those systems demand.
Why Healthcare Facilities Trust Allied Pipefreezing?
We understand the critical nature of healthcare infrastructure. That’s why APS offers:
Continuous Operations
We work around you. Live maintenance techniques mean patient care doesn’t pause.
Sterile, Non-Invasive Workflows
Our process protects sterile zones, operating rooms, and labs.
Nationwide Coverage
With teams across the UK, we respond quickly—day or night.
Certified and Experienced Technicians
Our engineers are fully accredited and experienced in medical settings.
Water and Energy Conscious Methods
We help facilities hit sustainability goals while maintaining system integrity.
Comprehensive Documentation
You’ll receive full reports for compliance, audits, and maintenance history.
Why Water Sector Clients
Work With APS
Water infrastructure carries a level of regulatory scrutiny that leaves little room for error. Supply continuity, water quality, and environmental performance are non-negotiable — and contractors working in this sector are held to the same standards as the utilities themselves.
No offline requirement:
Our techniques are built for live, pressurised systems. Supply commitments stay intact and regulatory obligations are protected.
Sector accreditations:
We carry the accreditations the water sector requires and work to framework programme timescales.
Audit-ready documentation:
Method statements, risk assessments, and completion records provided on every job for your compliance and handover files.
Nationwide coverage:
Direct experience across water, waste water, and process environments, supporting both planned maintenance programmes and reactive call-outs across the UK.
Contact Allied Pipefreezing Today
To discuss how our specialist pipeline services can support your water or waste water project, get in touch with the APS team.
Frequently Asked Questions
Can pipe freezing be used on live water mains without interrupting supply?
Yes. Pipe freezing allows a section of pipeline to be isolated while the wider network remains operational. This helps avoid costly shutdowns and minimises disruption to customers and critical infrastructure.
What types of pipelines can APS work on within the water and waste water sector?
APS can work on potable water systems, waste water pipelines, chilled water systems, rising mains, process lines, and industrial utility pipework across treatment plants, pumping stations, and distribution networks.
Can hot tapping be carried out on pressurised water pipelines?
Yes. Hot tapping enables APS to install new branch connections, valves, or monitoring points onto live pipelines without draining the system or interrupting service.
Why is line stopping used in the water industry?
Line stopping is used when a temporary isolation is required on a live pipeline where shutdowns are impractical. It enables repairs, diversions, or upgrades to be completed while maintaining flow through bypass systems.
Can APS support emergency repairs within the water sector?
Yes. APS provides rapid response support for emergency pipeline repairs, helping operators minimise downtime, protect assets, and restore systems safely and efficiently.
What are the benefits of using pipe freezing instead of draining a system?
Pipe freezing avoids the need to drain and refill large systems, reducing water loss, operational downtime, labour costs, and the risk of contamination.
Does APS work alongside principal contractors and utility providers?
Yes. APS regularly collaborates with principal contractors, utilities, and engineering teams to deliver safe and compliant pipeline interventions across complex projects.
Can APS work on ageing or difficult-to-access infrastructure?
Yes. APS has extensive experience working on legacy systems, confined spaces, and critical infrastructure where careful planning and specialist isolation techniques are required.