This part of ISO 21009 specifies operational requirements for static vacuum insulated vessels designed for a maximum allowable pressure of more than 0,5 bar (50 kPa). It may also be used as a guideline for vessels designed for a maximum allowable pressure of less than 0,5 bar (50 kPa). This part of ISO 21009 applies to vessels designed for cryogenic fluids specified in EN 13458-1 and EN 13458-2. Static cryogenic vessels are often partly equipped by the manufacturer, but may be installed or re-installed by another party, such as the operator, user or owner. For this reason, some of the scope of this part of ISO 21009, which includes installation, putting into service, inspection, filling, maintenance and emergency procedure, overlaps with EN 13458-1, EN 13458-2 and EN 13458-3. NOTE For the installation of these vessels, additional requirements can apply; these are defined in specific regulations.