Posted By Richard McLellan The work, for which I recently sought advice, has been delayed due to unexpected intervention of the laws of physics. The scaffold on our exhaust stack was physically secured to the stack. We started up the gas turbine, exhaust stack expanded due to heat, ( I remember something about this at school) grew in height and damaged the scaffold. Call out scaffold design engineer and redesign / strip out and rebuild the affected lifts. So my test fitting of insulators into the gap between the scaffold platform and exhaust stack has been delayed. Unfortunately I will be onshore by then and unable to delight you with a blow by blow account. Just for the record, I specified that especially robust scaffolders and insulators were to be supplied (cannot use the term f*t), that the gap between scaffold and stack be kept at less than 200 mm and the scaffs would be onsite to adjust the boards and maintain the gap as the work progressed.

Posted By Richard McLellan Frank, I did not explain the whole story from the start - we have two G/T's powering the platform with two exhaust stacks. Both need recladding and we will only take cladding off the stack when relevant GT is shut down and isolated. However we wanted to do some maintenance on the GT which will remain running during the work, so we swapped them over temporarily before the work started........ We have been wearing CO monitors on the top lift of the scaffold and its actually quite a pleasant work environment up there. Never a sniff of CO, I even held a monitor in the exhaust stream but it did not go off, so obviously our RB211 turbines are very efficient and putting out less than 30 ppm CO. The cladding will only be stripped off the offline stack - when we get round to it! Thanks for your help and interest