Cryoease Services Presales Assessment Form

It is the responsibility of the customer to ensure that the dewar is stored in a safe and responsible manner. The following is provided for your guidance. When Liquid Nitrogen containers are being stored or used, there will always be some nitrogen gas being released into the surrounding atmosphere. If, they are being stored or used inside a building, this may eventually reduce the oxygen level in the air, which could cause asphyxiation.. If however, the Liquid Nitrogen dewars are being stored or used outdoors this should not normally present any risk. Dewars kept and used outdoors must be kept in an area sheltered from the rain.

The paragraphs below deal with the general ventilation of rooms used for the storage or use of nitrogen dewars. Cold nitrogen gas is heavier than air and will accumulate at low level. Users should, therefore, take extra precautions in basement rooms, rooms with ventilation at high level and rooms with ducts in the floor where nitrogen can lead to other areas.

A room shall be sufficiently ventilated for the two normal conditions indicated below so as not to cause a reduction in oxygen concentration below 19.5%:

• the normal evaporation of all dewars and liquid nitrogen containers within the room.
• the filling losses from decanting liquid.

Additionally, the complete spillage of the contents of the largest dewar shall not cause the oxygen concentration to fall below 18%.

The use of oxygen depletion monitors is strongly recommended where there is a risk of oxygen depletion. As a rule of thumb, if the room volume in metres cubed less than the sum of the Liquid Nitrogen volume (in litres) multiplied by 6, the ventilation may be insufficient. In which case oxygen depletion monitoring or forced air ventilation may be required.

Air Products CryoEase Services can provide assistance with risk assessments and details of suppliers of oxygen depletion monitors.

The use and transfer of liquefied gas products within enclosed areas can be very hazardous if appropriate safety systems are not implemented. It is therefore essential that a user completes suitable and sufficient risk assessments to identify the hazards and risks and implement suitable safety systems. Air Products is committed to the safe use of its products and requires that the user confirms that appropriate systems have been implemented which enable the supplied products to be used safely.

By digitally signing this form as a duly authorised representative of the undersigned* hereby declare that I have a full understanding of the installation and the liquefied gas products which I have engaged Air Products to install on my site, and that I have implemented appropriate systems to enable the installation and products to be used safely.

I confirm I am in receipt of information (Air Products Safety Data Book / Product Data Sheet) relating to the properties of liquid and gaseous Nitrogen and have used the information to carry out a detailed risk assessment of the process within which the product is being used, and the environment in which the process operates.

I have considered all major factors including but not limited to the use of gas-monitoring equipment and forced air ventilation. I understand my responsibility to maintain any installed equipment in good working order to ensure the safety of the process and use of products supplied by Air Products. In addition, I understand the importance of promptly reporting the non-operation of such equipment.

I understand that liquid deliveries will not begin until Air Products is satisfied that I have made full consideration of all these issues.

*Signatory (customer representative) to be a directly employed individual of the business in question and MUST be someone in a position of safety/technical/operational authority within the business at which the system or product is being delivered.