EN 12213:1998

Foreword
Introduction
1 Scope
2 Definitions
3 General conditions for all methods
4 Measuring the heat leak by the loss of
  product method
5 Determination of the holding time
  (open system) in days from heat leak data
6 Holding times for closed systems
7 Test report
8 Bibliography
Annex A (normative) - Conversion of measured
        volumetric gaseous flow to mass flow
Annex B (normative) - Correction of measured
        mass flow rate with regard to deviation
        from reference conditions
Annex C (normative) - Equivalent loss determination,
        for product other than the test product

This standard defines a pratical method for determining the heat leak performance of cryogenic vessels. The methods include measurement on both open and closed systems. This standard neither specify the requirement levels for insulation performance nor when the methodology defined is applied. These requirements may be defined in design or operational standards/regulations.