The cranes inspected were three and a half years old and had seen extensive service following their commissioning. The inspection format was a typical ZPMC format with a check list for items to be inspected.
MIT proposed to our client a more in depth approach that we have used during our inspections of in-service land based drilling rigs during API 4G inspections. This approach includes multiple photographs of the inspection locations for a year to year comparison.
The major components and critical weld locations of each crane were inspected for failed coating, corrosion, and fatigue cracking.
MIT estimated a total of 24 man hours for inspection time per crane, this included photograph time.
Our actual inspection time for each crane averaged 20 man hours. This time savings was made up during loading and offloading.
MIT anticipated that the inspection could only be conducted during down periods of the cranes. We achieved this by establishing and implementing a safety plan prior to inspection. During this project no down time was charged due to inspection. This was a significant cost and time savings.
The project came in on time and on budget for both our client and inspection team.