Advanced 3D Laser Solutions (ALS), working closely with our client’s inspection department, have been engaged to complete the 3D laser scanning and analysis of the refineries bulk storage tanks.
The surveys are being completed with FARO Focus 3D laser scanners and spherical reference targets using three of our finest surveyors. Initially the surveys have been completed on ‘in-service’ storage tanks but ALS are completing ‘out service’ scanning with other major oil companies. With the ‘in service’ surveys ALS are completing both peripheral scans, capturing primarily shell plate information and specific scans designed to capture annual plate detail. The number of scans varies depending on tank diameter and dispositions. Where tanks share a common bund ALS plan the scanning such that the most effective route is achieved, resulting in the maximum number of tanks being scanned.
Our 3D laser surveyors are from an oil & gas background, giving ALS the experience in not only the understanding of exactly what should be captured in the scans, but also awareness from working on a fuels terminal. Our scanning on DSEAR sites is controlled with a ‘hot work’ permit system, our surveyors constantly monitoring the working environment using personal and sometimes area gas detectors. Even before we arrive on site, detailed risk assessments and method statements examining the potential risks in working on this type of site are considered. This being especially important whilst working on road loading racks were terminal operations need to be maintained with minimal disruption to client.
So what was the reason for the survey?
‘In-service’ tank scanning has been introduced to provide clients with interim ‘health checks’ on their bulk storage tanks to determine future API 653 maintenance requirements. The scanned data represents a very high resolution file allowing clients to analyse various parameters (see breakdown below). Follow up scanning of the subject tank allows ALS to run comparison analysis to detect movement / settlement occurring between the two scans. Our scan files being accurate to +/- 2mm. The ‘in-service’ processing carried out by ALS allowing clients to determine areas of concern where thickness testing of specific areas of tank shell can concentrated.