Doc. 224/20Static Vacuum Insulated Cryogenic Vessels Operation and Inspection

Static vacuum insulated cryogenic vessels are used for the storage of cryogenic (refrigerated liquefied) industrial and medical gases and are part of the customer’s gas supply system.

The properties of cryogenic gases require precautions to be taken and safety rules to be followed. Ignoring the precautions and safety rules can lead to accidents.

Cryogenic vessels shall be submitted to periodic inspections and testing.

This publication is intended to be used as guidance for persons involved in the operation, maintenance and inspections of cryogenic liquid storage installations.

This publication replaces EIGA Documents, Doc 114, Operation of Static Cryogenic Vessels, Doc 115 Storage of Cryogenic Gases at Users’ Premises and Doc 119 Periodic Inspection of Static Cryogenic Vessels.

This publication describes the operation and required inspections of static vacuum insulated cryogenic vessels at user premises, designed for a maximum allowable working pressure (MAWP) of more than 0.5 bar. This is in accordance with the definition of pressure equipment in the Pressure Equipment Directive. It may also be used as a guideline for vessels designed for a maximum allowable working pressure of less than 0.5 bar. It covers installations of vessels with an individual water capacity up to 125 000 litres.

Subjects covered in this publication include:

  • general information on cryogenic equipment;
  • layout and design features for installation;
  • putting into service / commissioning (documents, installation, checking);
  • maintenance and repair, taking out of service;
  • inspections (daily, filling and periodic); and
  • training of personnel.

The cryogenic vessels described in this publication are used for the storage of for liquid oxygen, nitrogen argon and helium. The principles are also applicable for other cryogenic gases including carbon dioxide, nitrous oxide and flammable gases. Toxic gas service is excluded from this publication. This publication does not address the vessels used in the production of cryogenic gases or vessels used for transport, which are covered by the Transportable Pressure Equipment Directive (TPED) or transport of dangerous goods regulations.

This publication applies to new installations and may be used as guidance for existing installations.