说明：  为了在城镇供热管网结构设计中，贯彻执行国家的技术经济政策，做到技术先进、经济合理、安全适用、确保质量，特制定本规范。
(In order to design the urban heating pipe network, the implementation of technical and economic policy of the state, so technologically advanced, economical, safe application, to ensure quality, formulated norms.)