Following the earlier post on lightning damage I have acquired a few photos. The donors wish to remain anonymous but I am very grateful to them.
The first three pictures are of the recently reported event which resulted in a leak. The the small stick inside the defect was to prevent any trace of gas from diffusing out after the pipeline section was blown down to atmospheric pressure. Apart from anything else it is interesting that a hole in the pipe as small as 1.6 mm could create such a large hole in the ground. It is easy to forget what high pressure gas can do.
The final photo is of a deep but non-penetrating defect that was found through in-line inspection. The effect on the coating is very different to the defect above – it looks as if the hole in the coating here is no larger than the crater in the steel and coating is only slightly blackened, whereas in the photo above the coating has been burned off or charred for a considerable distance.