District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of polyethylene

This specification establishes comprehensive technical requirements for factory-manufactured steel pipes designed for use in single-pipe underground hot water networks within district heating systems. The standard defines the essential characteristics of pipes equipped with polyurethane thermal insulation and an outer protective layer made of polyethylene, ensuring durability and thermal efficiency in subterranean installations. It details specific manufacturing processes, dimensional tolerances, and material properties necessary to maintain system integrity under operational conditions. The document outlines testing methods to verify the quality of insulation bonding, water tightness, and mechanical strength of the protective casing. Furthermore, it addresses markings, packaging, and delivery requirements to facilitate proper handling and identification throughout the supply chain. These guidelines support the development of reliable heating infrastructure by providing a consistent framework for product performance. Adherence to these parameters assists engineers and manufacturers in designing systems that meet safety and energy efficiency objectives. The content covers all aspects from raw material selection to final product inspection, serving as a reference for production and quality assurance procedures in this specialized sector.