Following a damaging lightning strike, Sifco Applied Surface Concepts worked with oilfield products and services company National Oilwell Varco (NOV) to successfully repair the Ensco 8505 drilling rig in the Gulf of Mexico. The lightning made a coin-sized gouge on the rig's crown-mounted compensator (CMC), which is responsible for stabilizing the drill string. Removing the CMC for replacement would have been extremely costly and time-consuming, with every hour of downtime costing the platform operator thousands of dollars in lost production.
Using Sifco's AeroNikl 7280 corrosion protection and the Cobalt 2043 to cap the repair for hardness, two of the company's technicians were able to make on-site electroplating repairs without the need for an immersion tank. It took them a total of 24 hours, situated 450 ft. in the air near the top of the derrick, to perform the repair and return the rig to full operation. The repaired cylinder was dimensionally accurate to 0.001" tolerance, compared to the 0.005" tolerance NOV originally requested. It would have taken three months to replace the shaft.blog comments powered by Disqus