GB/T 50539-2017 in English
VALIDCode of survey for oil and gas transportation pipeline engineering
- Issued on:2017-07-31
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 10 business days
$1,203.00
Introduction
Background and framework of the specification revision
According to the 2014 revision plan of the Ministry of Housing and Urban-Rural Development, this specification has been comprehensively upgraded from the 2009 version, adding new GNSS technology application clauses and adjusting the measurement level classification. After the revision, there are 12 chapters in total, and the core content covers:
| New content | Adjusted content | Deleted content |
|---|---|---|
| GNSS static positioning, fitted elevation terms | Plane/elevation control measurement chapter | Digital grid map and other terms |
| Network RTK measurement requirements | Line measurement chapter merger | Map control measurement |
Key technical requirements
1. Control measurement system
Plane control measurement: Adopting a four-level to three-level grading system, the mean error formula of GNSS static positioning baseline length is:
σ=√(a²+(b·D)²) (a=10mm, b=10~40mm/km)
Typical application case: A west-to-east gas transmission project adopts a fourth-level GNSS network, and the mean error of the side length is ≤1/40000
2. Topographic measurement accuracy
| Scale | Point error (mm) | Elevation error (contour interval) |
|---|---|---|
| 1:500 | ≤0.4 | 1/3 |
| 1:2000 | ≤0.8 | 1/2 |
Implementation points
GNSS operation specifications
- Static observation: satellite altitude angle ≥15°, effective satellites ≥4, time period ≥15min (fourth order)
- RTK measurement: PDOP＜6, mobile station distance to base station＜10km
- Antenna centering error ≤2mm, three-measurement height difference ≤3mm
Aerial photogrammetry
A Central Asia pipeline project uses 1:8000 aerial photography to produce 1:2000DOM. Key technical parameters:
- Ground resolution ≤0.2m
- Heading overlap 60%~65%
- Image inclination ≤2°
Typical problem solutions
Spanning scale zone processing: Calculate the adjacent scale coordinates of the two midline turning points on both sides of the scale zone boundary to ensure the unity of the coordinate system. A Sino-Russian East Line project uses three-scale zone conversion, and the plane displacement error is controlled within 0.05m.
Comparison of old and new standards
| Project | 2009 Edition | New Edition |
|---|---|---|
| Control measurement method | Total station as the main method | GNSS static + RTK combination |
| Tunnel measurement | Independent chapter | Integrated into Chapter 9 |
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