GB/T 28799.1 - 2020 is the beginning of the series of standards for heat-resistant polyethylene (PE) (PE-RT) piping systems for hot and cold water. This part is a general rule, which clearly defines the scope of application, covering the basic principles of the whole process from raw material selection to system design, installation and acceptance. It establishes the framework and foundation of the entire series of standards, provides guidelines for subsequent parts (such as pipe and pipe fitting standards), and helps to build a complete and standardized PE-RT piping system standard system for hot and cold water to ensure the safe and stable operation of the system.