现场渗透检测时，往往会遇到焊缝温度低于标准温度范围（低温条件），且环境温度较高、环境湿度较大的特殊检测情况。对于这类高温环境、低温介质条件下的渗透检测，不仅要考虑低温条件对检测工艺及操作方法的影响，同时还要考虑外部高温环境对焊缝表面状态的影响。通过对该问题进行分析，同时结合标准规范， 制定出一套满足现场检测要求的工艺、解决措施及相关注意事项。

While conducting on-site penetration testing of pipeline welding for the nuclear power plant (NPP), in some special cases one has to encounter the situation where the temperature is lower than the standard temperature range and the humidity is higher than the specification. On this higher temperature environment and lower temperature medium, undertaking the test needs not only to consider the procedure, but also to consider the surface of the welds affected by temperature. The paper analyzes the problems and proposes testing procedures and standards to meet the testing requirement by such an environmental situation. Some points needed to be noted are also mentioned.