BS EN 12213:1999

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

Describes a practical method for determining the heat leak performance of cryogenic vessels. Also its methods include measurement on both open and closed systems.