A liquid nitrogen storage vessel keeps biological samples at -195.8 degrees C inside a vacuum-jacketed aluminium or stainless steel container. The liquid nitrogen does not just cool the samples – it creates an environment in which biological degradation effectively stops, making these vessels the backbone of every IVF clinic, sperm bank, and embryology unit in the UK.
What does static evaporation rate mean and why does it matter?
Static evaporation rate tells you how many litres of liquid nitrogen the vessel loses per day when left undisturbed at 20 degrees C ambient temperature. A vessel losing 0.1 litres per day is far more economical to run than one losing 0.4 litres per day, particularly for labs topping up from bulk supply. Over a year, the difference in LN2 costs alone can justify the investment in a higher-quality vessel.
Does neck diameter affect sample safety?
Yes, directly. A wider neck allows faster evaporation and also introduces more ambient humidity into the vessel interior, which can cause ice build-up around the neck over time. Narrow-neck vessels are standard for long-term embryo and sperm storage. Wide-neck vessels are used where frequent access is needed and evaporation rate is less critical.
How many canisters should a storage vessel hold?
For a clinic running 200 to 400 cycles per year, a vessel accommodating six to nine canisters is typically sufficient. Larger sperm banks with longitudinal storage across thousands of patient samples generally require multiple vessels rather than one very large unit, because access time and sample organisation become more important than raw capacity.
A liquid nitrogen storage vessel is not just a piece of equipment – it is the last line of protection between a patient’s sample and total loss. Specifying on price alone is a risk no clinic should take.
Cryolab’s CryoNest Series covers storage vessels from small working dewars to high-capacity laboratory units. Contact Cryolab for a specification discussion.
