During the Uprating process in the 36-Inch gas pipeline from 850 psi to 1000 psi, investigative and corrective measures was performed, to determine if the proposed increase was safe and consistent with the company procedures and standard ASME B31.8 requirements.
Embedded Files
According to the preliminary assessment, our team detected a few situations that limited new maximum allowable operating pressure (MAOP) as it's indicated below:
✔️A couple of segments with current location class 4, limited the maximum allowable operating pressure (design factor - location class 3). In this order, we recommended replacing around 850 meters of pipe with a greater thickness, to comply with the standard ASME B31.8 requirements. Alternatively, relocate those sections of pipe.
✔️One equipment installed on the line didn't meet the requirement to operate the new MAOP. Thus, we recommended replacing that equipment, in order to operate safely and consistent with the requirements of ASME B31.8
On the other hand, there was evidence the pipeline had previously been tested to a pressure greater than the pressure design. In this order, we recommended continuing with the uprating procedure and continuing with additional field inspections to complete the assessment, as well as a new In-Line Inspection to evaluate the mechanical pipeline integrity condition.
The field inspections performed were:
✔️CIS and DCVG surveys
✔️In-Line Inspection (ILI)
Page updated
Google Sites
Report abuse