GB/T 27699-2023Technical specification for in-line inspection of steel pipeline (English PDF)

1 Scope

This document stipulates the requirements for implementing internal inspection of steel pipelines, internal inspection cycle and equipment selection, inspection construction preparation, pigging before inspection, several

The technical requirements for any deformation detection, metal loss detection, center line detection and axial strain detection, preprocessing of detection data, detection report, detection

Provisions are made for verification of test results, occupational health, safety, environment and delivery data:

This document is applicable to the detection in onshore steel pipelines where the conveying medium is gas and liquid, and the detection in subsea steel pipelines where the conveying medium is gas and liquid

In-pipeline testing can be performed with reference to this document:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

SY/T 5536 Crude oil pipeline operation specification

SY/T 5922 Operation Specifications for Natural Gas Pipelines

3 Terms and Definitions

The following terms and definitions apply to this document:

3:1

In-line inspection in-line inspection; ILI The detection is done by a detector running in the pipeline that can collect and record pipeline information in real time:

3:2

Geometry deformation detection geometry inspection

The in-pipe inspection is implemented for the purpose of detecting the geometric deformation of the pipe:

3:3

Metal loss detection metalloss inspection

In-pipeline inspection for the purpose of detecting metal loss in the pipe wall:

3:4

Centerline detection centerlineinspection

Utilize the inertial detection unit mounted on the internal detector, combined with ground marking and coordinate measurement of marking points, the pipeline can be generated through data analysis

Elevation, plane coordinates:

3:5 calibration calibrate

Test and adjust the mechanical performance and detection performance of the detection equipment:

3:6

Pigging

Use equipment that can operate in the pipeline to clean up impurities, scale and wax condensation in the pipeline: