爆炸性环境第10-1部分:区域分类爆炸性气体环境

[中文适用范围]： IEC 60079的这一部分涉及可能存在易燃气体或蒸气危险的区域分类，可作为支持在危险区域使用的设备的正确选择、安装设计、建造、操作和维护的基础。 它适用于可能存在由于易燃气体或蒸气与空气混合而引发的点火危险的情况，但不适用于： a) 易受瓦斯影响的矿井； b) 爆炸物的加工和制造； c) 超出本标准中异常和正常概念范围的灾难性故障或罕见故障（见3.7.3和3.7.4 4.5）； d) 用于医疗用途的房间； e) 商业和工业应用，其中仅使用低压燃气用于设备，例如烹饪、热水和类似用途，且安装符合相关燃气规范； f) 住宅场所； g) 可能存在可燃粉尘或可燃飞絮危险的情况，但其原则可用于评估混合混合物（另见IEC 60079-10-2）。 注：关于混合混合物的附加指南见附录I。 易燃雾可能与易燃蒸气同时形成或存在。在这种情况下，严格应用本文件中的细节可能不合适。当被认为由于高闪点而不构成危险的液体在压力下释放时，也可能形成易燃雾。在这些情况下，本文件中的分类和细节不适用。关于易燃雾的信息见附录G。 就本文件而言，区域是一个三维区域或空间。 大气条件包括高于和低于101.3 kPa（1013 mbar）和20°C（293 K）参考水平的变化，前提是这些变化对易燃物质的爆炸特性影响可以忽略不计。 在任何工艺厂区，无论大小，除了与设备相关的点火源外，可能还有许多其他点火源。在这种情况下，需要采取适当的预防措施以确保安全。本标准适用于对其他点火源的判断，但在某些应用中可能还需要考虑其他安全措施。例如，在考虑热工作许可证时，可能适用更大的距离。 本文件不考虑爆炸性大气点燃的后果，除非区域非常小，以至于如果发生点燃，其后果可以忽略不计（见3.3.8和4.4.2）。 [外文原描述]： IEC 60079-10-1:2020 CMV contains both the official standard and its commented version. The commented version provides you with a quick and easy way to compare all the changes between IEC 60079-10-1:2020 edition 3.0 and the previous IEC 60079-10-1:2015 edition 2.0. Futhermore, comments from IEC SC 31J experts are provided to explain the reasons of the most relevant changes. The contents of the corrigendum of March 2021 have been included in this copy. IEC 60079-10-1:2020 is concerned with the classification of areas where flammable gas or vapour hazards may arise and may then be used as a basis to support the proper design, construction, operation and maintenance of equipment for use in hazardous areas. It is intended to be applied where there may be an ignition hazard due to the presence of flammable gas or vapour, mixed with air, but it does not apply to: a) mines susceptible to firedamp; b) the processing and manufacture of explosives; c) catastrophic failures or rare malfunctions which are beyond the concept of normality dealt with in this standard; d) rooms used for medical purposes; e) domestic premises; f) where a hazard may arise due to the presence of combustible dusts or combustible flyings but the principles may be used in assessment of a hybrid mixture. Flammable mists may form or be present at the same time as flammable vapour. In such case the strict application of the details in this document may not be appropriate. Flammable mists may also form when liquids not considered to be a hazard due to the high flash point are released under pressure. In these cases the classifications and details given in this document do not apply. For the purpose of this document, an area is a three-dimensional region or space. Atmospheric conditions include variations above and below reference levels of 101,3 kPa (1 013 mbar) and 20 °C (293 K), provided that the variations have a negligible effect on the explosion properties of the flammable substances. In any site, irrespective of size, there may be numerous sources of ignition apart from those associated with equipment. Appropriate precautions will be necessary to ensure safety in this context. This standard is applicable with judgement for other ignition sources but in some applications other safeguards may also need to be considered. E.g. larger distances may apply for naked flames when considering hot work permits. This document does not take into account the consequences of ignition of an explosive atmosphere except where a zone is so small that if ignition did occur it would have negligible consequences. This third edition of IEC 60079-10-1 cancels and replaces the second edition, published in 2015, and constitutes a technical revision, see foreword for further details.