ISO 21013-3:2016提供了单独的计算方法，用于确定在以下规定条件下需要释放的质量流量: -真空绝缘容器，其绝缘系统（外护套+绝缘材料）在正常真空下完好无损，外护套在环境温度下，内容器在规定的泄压压力下的内容物温度下； -真空绝缘容器，其绝缘系统（外护套+绝缘材料）在正常真空下完好无损，外护套在环境温度下，内容器在规定的释放压力下的内容物温度下，压力构建的压力调节器- 使系统充分发挥潜力； -真空或非真空保温容器，保温系统保持在适当位置，但真空保温容器、环境温度下的外护套、规定释放压力下的内容物温度下的内容器或真空或非真空保温容器（保温系统完全或部分保持在适当位置）的真空损失，但在真空绝缘容器、火灾吞没、内容器在规定泄放压力下的内容物温度下出现真空损失； -真空隔热容器，容器内的液体饱和温度低于75 K，压力为1巴，隔热系统保持在原位，但真空空间中的空气或氮气会导致真空损失； -真空隔热容器，容器内的流体饱和温度低于75 K，压力为1巴，隔热系统保持在原位，但真空空间中的空气或氮气会导致真空损失，并导致火灾； -装有保温系统的容器完全丢失，并被火灾吞没。 在没有为适用条件提供适当计算方法的情况下，需要采用基于成熟理论物理科学的良好工程实践来确定所需的质量流量。 附录A中给出了低温恒温器减压装置的建议。

ISO 21013-3:2016 provides separate calculation methods for determining the required mass flow to be relieved for each of the following specified conditions: - vacuum-insulated vessels with insulation system (outer jacket + insulating material) intact under normal vacuum, outer jacket at ambient temperature, inner vessel at temperature of the contents at the specified relieving pressure; - vacuum-insulated vessels with insulation system (outer jacket + insulating material) intact under normal vacuum, outer jacket at ambient temperature, inner vessel at temperature of the contents at the specified relieving pressure, pressure regulator of the pressure build-up system functioning at full potential; - vacuum or non-vacuum-insulated vessels with insulation system remaining in place, but with loss of vacuum in the case of vacuum-insulated vessels, outer jacket at ambient temperature, inner vessel at temperature of the contents at the specified relieving pressure or vacuum or non-vacuum-insulated vessels with insulation system remaining fully or partially in place, but with loss of vacuum in the case of vacuum-insulated vessels, fire engulfment, inner vessel at temperature of the contents at the specified relieving pressure; - vacuum-insulated vessels containing fluids with saturation temperature below 75 K at 1 bar with insulation system remaining in place, but with loss of vacuum with air or nitrogen in the vacuum space; - vacuum insulated vessels containing fluids with saturation temperature below 75 K at 1 bar with insulation system remaining in place, but with loss of vacuum with air or nitrogen in the vacuum space with fire engulfment; - vessels with insulation system totally lost and fire engulfment. Good engineering practice based on well-established theoretical physical science needs to be adopted to determine the required mass flow where an appropriate calculation method is not provided for an applicable condition. Recommendations for pressure relief devices for cryostats are given in Annex A.