T/LGBA 002-2019 Active Group standards

T/LGBA 002-2019 Thermal-resistant Polyethylene (PE-RT II) Direct Buried Insulated Heat Supplying Pipeline Engineering Technical Specification

Publish Date: 2018-12-01 Implement Date: 2019-03-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/LGBA 002-2019

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Water supply and drainage projects

ICS Name: The water supply system

Publish Date: 2018-12-01

Implement Date: 2019-03-01

Scope

Scope: This standard applies to the design, construction, and acceptance of directly buried heating pipelines in urban heating networks of Liaoning Province, where the working pressure does not exceed 1.5 MPa and the hot water temperature does not exceed 80°C. Main technical content: The main technical content and framework of this standard include: 1. General provisions; 2. Terms and symbols; 3. Materials; 4. Design; 5. Construction; 6. Pressure testing, cleaning, and trial operation; 7. Project completion and acceptance, and appendices. 1. The main research content in this specification is to calculate the design ring stress of the pipes according to the operating conditions of the working pipe materials, and then provide the design stress of different series of pipes to meet the operating needs of heating pipelines with different temperatures and pressure levels. 2. Considering that the thermal expansion coefficient of plastic pipes is large during the construction process, whether there is a need for thermal compensation. The PE-RT II raw material is imported from Europe and has been applied in Europe for more than 20 years. During the construction process, it is installed without compensation. Although the thermal expansion coefficient of plastic pipes is larger than that of steel pipes, the elastic modulus is much smaller than that of steel pipes. The thermal displacement of the pipes is constrained by the friction force of backfilling soil and protective pipes, which is suitable for directly buried installation without thermal compensation. Plastic materials are viscoelastic materials and exhibit stress relaxation (stress relaxation refers to the phenomenon that the internal stress of materials gradually decreases with time under certain conditions). The thermal stress inside the pipes will gradually decrease and disappear over time. PE-RT II directly buried heating pipelines have also been used in some regions of China (such as Jilin and Qingdao), all of