GB/T 16805-2017 in English
VALIDThe pressure testing of steel pipelines for the transportation of petroleum， gas and highly volatile liquids
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 16805-2017输送石油天然气及高挥发性液体钢质管道压力试验》由TC355（全国石油天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Background of Standard Revision and Technical Evolution
This standard replaces GB/T 16805-2009, mainly adding 12 new term definitions such as pressure balance, strengthening the management requirements for pressure test media, and adding 8 technical contents such as pressure test personnel qualifications and leak location. It reflects the industry's deepening understanding of pipeline integrity management, especially the prevention and control needs of new risks such as stress corrosion cracking (SCC).
Comparison of Core Test Types
| Test Type | Pressure Ratio | Duration | Core Purpose | Defect Detection Capability |
|---|---|---|---|---|
| Peak Test | ≥1.25 | 5min-1h | Verify Structural Integrity | Detect 86% of Deep Defects |
| Strength Test | 1.25 | ≥4h | Determine Operating Pressure Limit | Detect 66% of Deep Defects |
| Tightness test | <1.25 | ≥2h | Verify no leakage | Micron-level leakage detection |
Key implementation requirements
Selection of pressure test medium
Water medium is preferred. When non-aqueous medium is used, the following six conditions must be met: Reid evaporation pressure <0.05MPa, non-submarine pipeline, and far away from densely populated areas. In special cases, static grounding equipment and leakage emergency treatment equipment must be configured.
Equipment Configuration Specifications
26 types of equipment are required, including: large volume pump (flow rate control 3-5km/h), pressure balance (accuracy 0.0067MPa), temperature sensor (deviation ≤0.5℃), etc. The measuring equipment should avoid the influence of extreme weather, and the pressure recorder needs to be calibrated every year.
Typical Implementation Case
In a DN1200 pipeline strength test, a nonlinear segment was found through the pressure-volume diagram (as shown in Figure 2), confirming that the residual air accounted for 0.18%. After installing an exhaust valve at a high point, the test pressure was stabilized at 12.5MPa (90%SMYS), and the pressure drop was ≤0.03MPa after 4 hours of pressure stabilization, which met the acceptance criteria.
Implementation recommendations
- New pipelines should be pressure tested within 72 hours after backfilling to avoid the impact of soil settlement
- The use of electronic positioning system in conjunction with acoustic detection can improve the efficiency of leak location by more than 40%
- It is recommended that the peak test pressure should not exceed 110% of SMYS to avoid plastic deformation of the material
- The test records should be kept permanently and include at least 53 data elements (see Appendix A)
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