District heating and district cooling pipes - Bonded pipe systems for directly buried hot and cold water networks - Part 2: Factory made steel service valve assembly for steel service pipes, polyurethane thermal insulation and a casing of polyethylene

This standard establishes comprehensive technical requirements and guidelines for pipe systems connecting centralized heating and cooling networks to direct-buried hot and cold water piping infrastructure. Specifically, it addresses the second part of a series focusing on pre-insulated pipe components manufactured in factories, constructed from steel. These elements are designed to ensure thermal efficiency, mechanical durability, and long-term reliability when integrated into buried distribution networks. The document outlines specifications for material selection, dimensional tolerances, insulation integrity, and protective measures against corrosion and external damage. It provides detailed instructions on the assembly and quality assurance procedures necessary for maintaining system performance under varying environmental conditions. By defining strict criteria for factory-fabricated insulated fittings, the text supports consistent implementation across regional energy distribution projects. The scope includes various connection types and configurations essential for seamless integration between main supply lines and consumer endpoints. Adherence to these technical parameters facilitates optimal heat transfer, minimizes energy losses, and enhances the overall safety of underground utility installations. This reference serves as a foundational document for engineers and manufacturers involved in the design and deployment of modern thermal grid components.