One. Measuring and marking
For heating pipe locations, use the centerline and the outer edge of the sloping pipe trench. While ensuring the depth of the pipe trench, it is preferable to avoid collapse. For circular wells, draw a circle with the center being the midpoint of the space between the two pipes. For rectangular wells, draw the lines according to the design dimensions, centered on the space between the two pipes, extending to the four sides.
II. Excavation of soil
Before excavation, determine the slope ratio of the trench according to the specifications, design drawings, and the soil conditions at the site. The excavated soil and rock should be placed on the opposite side of the trench, with a distance of not less than 1 meter from the trench edge.
III. Trench Construction
Common materials for trench construction are brick, but trenches for numbering, passing through retaining walls, and at slope protection areas are typically constructed with reinforced concrete. It is particularly important to ensure that the mortar is fully filled and the slurry is evenly applied during construction, using specialized tools.
IV. Installation of Pipe Supports
The arrangement and type of pipe supports should meet the requirements for pipe loads, compensation, and displacement, while also minimizing pipe vibrations. Additionally, the stability, strength, and stiffness of the pipes, as well as the temperature and operating pressure of the transported medium, must be considered.
V. Installation of Piping
To expedite construction progress, pipelines should be installed using a crane. Prior to crane installation, pipeline supports should be inspected to ensure that the foundation's existing elevation and dimensions comply with the design requirements.
Six、Water pressure test
After the installation of heating pipes is complete, but before testing, the construction quality control personnel should conduct a thorough and comprehensive inspection and verification according to the design requirements. Then, they should connect the pipes, fill them with water, and check for any signs of water leakage or water loss. After the flushing check, if no abnormalities are found, the system can be pressurized tested. After the pressure testing is complete, the blind plates, expansion joints, and other limiting devices should be promptly removed, and all accumulated water in the system should be drained.
Seven. Pipe Anti-corrosion and Insulation
Insulation is applied after painting. After applying two coats of red paint to the system's pipes and components, and after removing rust from the pipe supports, apply two coats of gray paint. For steam pipes, the insulation material consists of a composite of magnesium silicate and phenolic foam. The outer layer of the insulation material in the trench is a composite aluminum foil.
Eight. Pipeline Cleaning
Flush out mud, dirty water, slag, and debris from the pipes, ensuring that the discharged water and rinse water have the same color and transparency, which indicates a passing result.
IX. Trial Run
The trial run should be conducted continuously for 72 hours under the specified trial run parameters. During the trial run, particular attention should be paid to the condition of the heating pipe supports.