GB/T 27699-2023 in English
VALIDTechnical specification for in-line inspection of steel pipeline
- Issued on:2023-05-23
- Implemented on:2023-05-23
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 27699-2023钢质管道内检测技术规范》由TC262（全国锅炉压力容器标准化技术委员会）归口，TC262SC3（全国锅炉压力容器标准化技术委员会压力管道分会）执行，主管部门为国家标准委。
Introduction
Core changes in the standard revision
| Revision dimensions | 2011 version | 2023 version |
|---|---|---|
| Terminology system | 13 terms | 4 new terms including centerline detection, and 2 deleted |
| Detection cycle | No clear requirements for new pipelines | Requirements for new pipelines to be completed within 3 years after commissioning |
| Technical indicators | Single metal loss detection | New Axial strain detection (accuracy ±0.01%) |
Key Testing Technical Specifications
1. Testing Equipment Selection Matrix
| Test Type | Recommended Equipment | Accuracy Requirements | Applicable Scenarios |
|---|---|---|---|
| Geometric Deformation | Size Plate + Inertial Unit | Sag Detection ±2-5mm | New Pipeline Acceptance |
| Metal Loss | Ultra-High Definition Magnetic Leakage Detector | Depth Accuracy ±5%t | Pipeline Operating for More Than 20 Years |
| Axial strain | Circumferentially symmetrical strain probe | 200με threshold | High-incidence areas of geological disasters |
2. Typical implementation process
- Preliminary preparation: Complete the pipeline survey form (Appendix D)
- Pigment operation: Magnetic pig to remove ferromagnetic impurities (7.4.2)
- Equipment calibration: Pull test field verification (6.5.3)
- Data collection: Set the spacing between points ≤1km (6.6)
Innovative technology application
Technical requirements for Centerline detection added in the 2023 version:
- Positioning deviation <1m (credibility 80%)
- Curvature radius recognition capability 400D
- Three-dimensional coordinate output format "Northeast High"
Implementation suggestions
1. Special pipe section processing
For tees with openings＞30% of the outer diameter of the pipe, baffles should be set according to Appendix A:
- DN350 and below: only longitudinal baffles
- DN500 and above: baffle height ≥100mm
2. Data verification requirements
The test report must meet the following requirements:
- ≥5 verification points per 100 kilometers (14.1.1)
- POD and confidence ≥ 80% (14.1.2)
- Include ERF value calculation (13.2.4)
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