Planning a liquid-nitrogen storage room

Getting the room, equipment and building services right from the outset

A liquid-nitrogen storage room cannot be planned around the freezers alone.

The room also has to accommodate equipment delivery and replacement, day-to-day sample handling, the LN₂ supply and pipework, ventilation, oxygen monitoring, alarms, emergency isolation and safe escape.

These requirements are much easier to resolve before the room layout and building services are fixed. If the cryogenic design is considered too late, projects can be left with awkward pipe routes, insufficient access around the equipment, poorly positioned ventilation and separate control systems that have never been designed to work together.

Start with how the facility will be used

The starting point is the samples: what will be stored, at what temperature, in which containers and how often staff will need access. Future growth and contingency space matter too. A room that is full on opening day has nowhere to put the next freezer and little resilience if a vessel needs to be taken out of service.

The proposed room then needs to be checked in practical terms:

· Can the floor carry the operating weight of the freezers?

· Will the largest item pass through the doors, corridors and lifts?

· Is there enough space to open lids, remove racks and maintain the equipment?

· Can the LN₂ supply, pipework and vent routes be kept reasonably short and direct?

· Can staff leave safely, and can entry be restricted during an alarm?

· Is there room for the facility to grow without compromising access or airflow?

The systems need to be planned together

Cryogenic freezers, ventilation, oxygen detection, automatic filling, emergency isolation and building alarms are often supplied by different companies. Each part can operate correctly on its own while gaps remain between them.

Before equipment is ordered, the project team needs to agree what must be proved before filling starts, what happens if airflow or power is lost, which alarms trigger protective action, which valves close and where faults are reported when the room is unattended. The finished installation then needs to be commissioned and tested as a complete system.

LABMODE works with clients and their building-services designers to define the cryogenic requirements, plan the equipment and LN₂ supply, coordinate the control interfaces and support installation, commissioning and ongoing maintenance.