BS EN ISO 21013-3:2016提供了确定所需质量流量的单独计算方法 在下列规定条件下释放:真空绝缘容器，绝缘系统（外护套+绝缘材料）在以下条件下完好无损 正常真空，环境温度下的外护套，内容物温度下的内容器 规定的泄压压力；真空隔热容器，隔热系统（外护套+绝缘材料）在以下条件下完好无损 正常真空，环境温度下的外护套，内容物温度下的内容器 规定的泄压压力，压力构建的压力调节器- 启动系统在 充分发挥潜力；真空或非真空保温容器，保温系统保留在适当位置，但失去 真空绝缘容器的真空度，环境温度下的外护套，环境温度下的内容器 在规定的释放压力或真空或非真空绝缘条件下的内容物温度 保温系统保持完全或部分到位，但容器内真空损失的容器 真空隔热容器的外壳、火灾吞没、内部容器的温度为 规定的泄放压力；装有饱和温度低于75 K（1巴）流体的真空绝缘容器 保温系统保持在原位，但真空度损失，空气或氮气进入 真空空间；装有饱和温度低于75 K、压力为1 bar的液体的真空绝缘容器 绝缘系统保持在原位，但真空中有空气或氮气，导致真空损失 火灾吞噬的空间；装有保温系统的容器完全丢失，并被火灾吞没。需要采用基于成熟的理论物理科学的良好工程实践 在未提供适当计算方法的情况下，确定所需的质量流量 适用条件。附录A中给出了低温恒温器减压装置的建议。 交叉引用:2014/68/UEISO 4126-1ISO 4126-6ISO 4126-10CGA S-1.2:1995CGA S-1.3:1995API 520:2014购买本文件时可获得的所有当前修订版均包含在购买本文件中。

BS EN 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.Cross References:2014/68/UEISO 4126-1ISO 4126-6ISO 4126-10CGA S-1.2:1995CGA S-1.3:1995API 520:2014All current amendments available at time of purchase are included with the purchase of this document.