Zero Downtime for NHS Critical Care: A Nitrogen Freezing Success Story
We overcame a complex, specialist mechanical services, challenge for a NHS England hospital that threatened to disrupt critical operating theatre services.
The Challenge: A hospital needed to replace an Air Handling Unit (AHU) in an active operating theatre. However, faulty isolation valves and a shared cooling system meant they couldn’t shut off the water without closing several other theatres simultaneously. This was an unacceptable risk to patient care.
The Solution: Our specialist mechanical services team applied liquid nitrogen pipe freezing to the main flow and return lines. This created local "ice plugs" within the pipes, providing a secure, temporary isolation. While the rest of the hospital’s cooling system remained fully operational, our engineers safely cut the pipework and installed new isolation valves.
Key Benefits of Nitrogen Freezing:
- Zero Disruption: Critical facilities remain live throughout the process.
- Clean & Efficient: Only the immediate pipe section needs draining.
- Highly Versatile: Safe for use on carbon steel, stainless steel, copper, and plastic.
- Safety First: Nitrogen is an inert gas, eliminating fire or explosion risks.
The Result: The job was carried out with no downtime and minimal disruption to essential services. It allowed other theatres to continue their life-saving work while a permanent solution was delivered.
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The pictures below show the Nitrogen freezing operation; the frozen plug inside the pipework once the Nitrogen has frozen the internal water; and the newly installed isolation valves.
