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Member:sungbeanJo_GG [2020/11/24 19:55] sungbean |
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| - | inspection tool on those pipelines which can be monitored using such devices. The inspection device typically | + | The trial has successfully demonstrated ROSEN’s |
| - | includes systems to detect corrosion and geometric | + | methodology to estimate the depth of cover over |
| - | anomalies such as dents. In addition, inspection devices | + | pipelines. This includes producing an accurate |
| - | often include an inertial measurement unit (IMU), these | + | pipeline centreline from data obtained during a |
| - | units contain gyroscopes and accelerometers and are | + | routine internal inspection, combined with ground |
| - | used to calculate position of the inspection device. The | + | elevation data available from the Environment |
| - | IMU data can be linked to known reference locations | + | Agency (EA) to calculate depth of cover. |
| - | along a pipeline route to provide an accurate pipe centerline as a series of X, Y, and Z coordinates. | + | • The results of the calculation have been validated |
| - | dePth of Cover estiMation | + | against infield depth of cover measurements obtained using a pipe and cable locator. The accuracy |
| - | The methodology trialed to estimate depth of cover | + | of the depth of cover results has been calculated |
| - | combines ground elevation data with an accurate pipe | + | using a root mean square (RMS) error method. This |
| - | centerline derived from internal inspection. | + | has determined an overall accuracy of ±0.15 m using EA LiDAR data. |
| - | DEPTH OF COVER REQUIREMENTS | + | • Infield ground surface measurements were compared with the EA LiDAR and OS Terrain data. A |
| - | In the United Kingdom (UK) guidance on minimum | + | |
| - | depth of cover for onshore high pressure pipelines is | + | |
| - | provided in IGEM/TD/1 [2] and PD 8010 [3]. NGGT operate their high pressure pipelines in accordance with | + | |
| - | IGEM/TD/1 Edition 5. | + | |
| - | Table 1 provides a summary of the minimum depth of | + | |
| - | cover requirements of IGEM/TD/1 (all editions), PD 8010 | + | |
| - | and other relevant international standards. | + | |
