本英国标准规定了直接燃烧锅炉和圆柱形、立式和机车式设计的余热锅炉的要求，这些锅炉通过熔焊按照II级和III级要求制造。本标准涵盖的锅炉拟用于在1.1.2中给出的限制范围内提供蒸汽或热水的土地用途。本标准不适用于水锅炉（见BS 1113）。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This British Standard specifies requirements for directly-fired boilers and to waste-heat boilers of cylindrical, vertical and locomotive type designs, constructed by fusion welding to Class II and Class III requirements. The boilers covered by this standard are intended for land use for providing steam or hot water within the limits given in 1.1.2. This standard does not apply to water-tybe boilers (see BS 1113).All current amendments available at time of purchase are included with the purchase of this document.