DL/T 2720-2023
Pressure tube device (English Version)
- Standard No.
- DL/T 2720-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- Professional Standard - Energy and Power Planning CN / NDGJ
- Latest
- DL/T 2720-2023
- Introduction
Interpretation of the core content of the standard
This standard systematically regulates the full life cycle management requirements of piezometer devices for the first time, focusing on solving the standardization problem of seepage pressure monitoring in hydropower projects. The standard is applicable to seepage monitoring scenarios of concrete dams, earth-rock dams and other hydraulic structures and geotechnical engineering.
Analysis of key technical requirements
Components Material standards Key indicators Test pipe GB/T 8162/GB/T 29038 Pressure resistance ≥1.5MPa, pore diameter 0.5-1mm Pipe mouth device GB/T 197 Thread accuracy 6g grade Filter layer DL/T 5178 Graded gravel thickness ≥15cm
Key points of project implementation
Taking Tianshengqiao Hydropower Station as an example, attention should be paid to the installation of the piezometer at the dam foundation:
- Drilling inclination should be ≤1°
- Water inlet pipe section needs to be wrapped with 300g/m² geotextile
- Conduit section welding joint strength ≥90% of parent material
Background of standard evolution
This standard integrates 7 current standards, including GB/T 29038 thin-walled stainless steel pipe technology and DL/T 5178 monitoring specifications, and makes special provisions for problems such as pipe corrosion and data distortion found in hydropower projects, which improves the accuracy by more than 30% compared with the old monitoring scheme.
DL/T 2720-2023 Referenced Document
- DL/T 5178 Technical specification for safety monitoring of concrete dams*， 2026-03-01 Update
- DL/T 5784 Technical specification for construction of concrete dam safety monitoring system*， 2026-03-01 Update
- GB/T 1226 General pressure gauge
- GB/T 191 Packaging and Storage Graphic Symbols Mark*， 2025-08-29 Update
- GB/T 197 General purpose metric screw threads—Tolerances
- GB/T 29038 Technical Specifications for Thin-Wall Stainless Steel Pipes*， 2024-09-29 Update
- GB/T 6388 Transport package shipping mark
- GB/T 8162 Seamless steel tubes for structural purposes
DL/T 2720-2023 history
- 2023 DL/T 2720-2023 Pressure tube device
