Pipefreezing Services
for the Healthcare Sector

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Specialised, Non-invasive Solutions for Uninterrupted Healthcare Operations

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In healthcare, system downtime can compromise more than just schedules—it can impact lives. From surgical theatres and ICUs to laboratories and wards, uninterrupted service is non-negotiable. That’s where Allied Pipefreezing Services (APS) comes in.


Our state-of-the-art pipefreezing methods allow you to isolate and service pressurised systems without the need to drain or shut down entire networks—keeping your healthcare facility fully operational, safe, and compliant.

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Common Challenges
in Healthcare Facilities

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Even routine maintenance becomes high risk in healthcare environments. Key challenges include:

No-Room-for-Error Downtime:

Shutting down systems can delay procedures or impact patient safety.

Sterile Environment Requirements:

Working in clean zones like surgical theatres or ICUs demands non-invasive, contamination-free methods.

Regulatory Compliance:

Every intervention must follow strict health and safety regulations.

Multi-System Complexity:

Medical gas, HVAC, water, and fire systems
are interlinked—one interruption can affect many.

Emergency Readiness:

Maintenance work must not impair the facility’s emergency response capabilities.

Our Solutions

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Pipe Freezing

Create temporary, controlled ice plugs to isolate sections of pipeline – ideal for targeted repairs without full-system shutdowns.

  • No need to drain systems
  • Prevents fluid contamination
  • Suitable for sensitive environments
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Hot Tapping

Add connections or valves to live systems without interrupting service.

  • No shutdown required
  • Pressure-rated solutions
  • Minimal disruption in live care environments
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Line Stopping

Safely stop the flow in pressurised systems to allow repairs or modifications.

  • Enables sectioned-off work
  • Avoids full-facility impact
  • Works across multiple system types
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Shrink Fitting

Use thermal contraction for precision pipe 
fitting—especially useful in high-spec
installations like labs or HVAC upgrades.

  • Tight, leak-free seals
  • No adhesives or welding
  • Ideal for surgical zones or medical labs
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Where We Help

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Climate Control Systems

Maintain stable temperatures in operating rooms, recovery areas, and wards while servicing heating and cooling lines—ensuring no disruption to patient comfort or care.

Medical Gas Systems

Support uninterrupted access to oxygen, nitrous oxide, and other critical gases. Our pipefreezing process protects life-supporting systems during maintenance.

Water Supply Systems

Carry out work on domestic hot and cold water systems without affecting hygiene protocols or availability across
the facility.

Fire and Safety Systems

Maintain fire suppression and emergency infrastructure
while staying fully compliant with healthcare regulations.

Testimonials

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Here are some of the nice things our clients say about our services.

We found the service to be invaluable. The time it took to complete the works was substantially less had a traditional shutdown be carried out. The need to continue supply to the critical wards was crucial. Other more traditional methods would not have been able to offer this benefit.
NHS Ninewells Hospital, Dundee
NHS Ninewells Hospital, Dundee

Why Healthcare Facilities Trust Allied Pipefreezing?

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We understand the critical nature of healthcare infrastructure. That’s why APS offers:

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Continuous Operations

We work around you. Live maintenance techniques 
mean patient care doesn’t pause.

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Sterile, 
Non-Invasive Workflows


Our process protects sterile zones, operating rooms, and labs.

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Nationwide Coverage

With teams across the UK, we respond quickly—day or night.

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Certified and 
Experienced Technicians

Our engineers are fully 
accredited and experienced 
in medical settings.

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Water and Energy Conscious Methods

We help facilities hit sustainability goals while maintaining system integrity.

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Comprehensive Documentation

You’ll receive full reports for compliance, audits, 
and maintenance history.

Our Solutions

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Certified to Work
in Medical Environments

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Our team brings extensive experience working with hospitals, clinics, labs, and critical care facilities. You can expect:

  • Full compliance with healthcare protocols 
and hygiene standards

 

  • 24/7 emergency response options

 

  • Transparent communication with on-site teams

 

  • Detailed documentation for audits, records, and compliance

Contact Allied Pipefreezing Today

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Discuss how our specialised services can support your healthcare facility—safely and efficiently.

Request a Quote
0845 658 0425
info@alliedpipefreezing.co.uk

Frequently Asked Questions

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Can pipe freezing be used in a live hospital without shutting down services?
Yes. Pipe freezing is specifically designed to allow pipeline maintenance in live, operational environments — including hospitals that cannot afford any interruption to services. The process creates a temporary ice plug inside the pipe using liquid nitrogen, isolating a targeted section while the rest of the system continues to operate normally. At Allied Pipefreezing Services (APS), we have extensive experience carrying out pipe freezing in NHS hospitals, private healthcare facilities, and specialist care units without any disruption to patient services, heating, water, or medical gas supply.
Pipe freezing can be applied to medical gas pipelines, including oxygen, nitrous oxide, and medical air systems. The technique uses liquid nitrogen applied externally to the pipe to freeze the contents and form a solid ice plug, creating a temporary isolation point. This allows valve replacements, section repairs, or new connections to be made without shutting down the medical gas supply to wards, theatres, or critical care areas. APS engineers are trained and accredited to work on medical gas systems in accordance with HTM 02-01 (Medical Gas Pipeline Systems) guidelines, and all work is carried out with full risk assessment and method statement documentation.
A typical pipe freezing operation in a hospital setting takes between 2 and 8 hours, depending on the pipe diameter, pipe material, contents, and the complexity of the maintenance work being performed. Smaller pipes (up to 50mm) can often be frozen and isolated within 1–2 hours. Larger mains (100mm–300mm) may require longer freeze times. APS carries out a full site survey before every project and provides a detailed method statement with estimated timescales, so hospital estates teams can plan around clinical schedules. Where required, we work outside of normal hours including nights, weekends, and between clinical sessions in order to minimise any impact on patient care.
Pipe freezing and line stopping are both methods of isolating a section of live pipeline without a full system shutdown, but they work differently and are suited to different situations. Pipe freezing uses liquid nitrogen to create a temporary ice plug inside the pipe which is best suited to static or low-flow systems such as domestic water, heating, chilled water, and medical gas lines. Line stopping is a mechanical method that physically blocks the flow inside the pipe. It is used where flow rates are too high for freezing, or where a bypass is needed to maintain supply during the work. In healthcare settings, APS often uses both techniques on the same project. For example, pipe freezing might be used on ward-level pipework while line stopping with a temporary bypass is used on larger mains feeding multiple buildings.
Is pipe freezing safe to use near operating theatres and ICUs?
Yes. Pipe freezing is a non-intrusive, low-disruption technique that is safe to use in sensitive clinical environments including operating theatres, intensive care units (ICUs), and sterile zones. The process produces no vibration, no sparks, and no contamination of the pipeline contents. The only by-product is the controlled evaporation of nitrogen gas, which is managed through adequate ventilation — a standard safety measure that APS implements on every healthcare project. Our engineers carry out full site assessments before any work begins, and all operations comply with NHS safety protocols and healthcare-specific regulations.
Allied Pipefreezing Services holds a comprehensive range of industry accreditations relevant to healthcare environments. These include: SafeContractor (health and safety compliance), Constructionline (supply chain pre-qualification), CHAS (Contractors Health and Safety Assessment Scheme), ISO 9001:2015 (quality management), Gas Safe Register (gas safety), UVDB (utilities sector pre-qualification), and membership of the British Safety Council. Our engineers hold CSCS cards for their relevant disciplines and undergo regular training managed through a CITB-approved Training Plan. We also maintain full HSEQ documentation for every project, providing the compliance audit trail healthcare clients require.
Yes. Hot tapping (also called under pressure drilling) allows new connections to be made to live heating, domestic water, or chilled water systems without shutting down the network. This is particularly valuable in hospitals where heating systems serve critical areas and cannot be taken offline. APS has carried out hot tapping on NHS hospital heating mains, domestic hot water systems, and chilled water pipework. The process involves fitting a new branch connection and valve to the existing pipe, pressure testing it, and then drilling through under controlled conditions. The system remains fully operational throughout. All hot tapping work in healthcare settings is performed by APS certified technicians with full compliance documentation.

Yes. APS provides 24/7 emergency response for pipe freezing, hot tapping, and line stopping across the UK. We understand that hospital pipeline emergencies such as leaks on domestic water mains, heating failures, or compromised medical gas lines cannot wait for scheduled maintenance windows. Our teams are equipped to mobilise at short notice, carry all necessary equipment, and work outside of normal hours to resolve the issue with minimal disruption to patient care. Contact APS on 0845 658 0425 or email info@alliedpipefreezing.co.uk for emergency support.