Available online
Description
The programme continues TV7 of this course and is an examination of the effectiveness of non destructive testing techniques used during construction of a North Sea oil rig platform.
The programme continues TV7 of this course and is an examination of the effectiveness of non destructive testing techniques used during construction of a North Sea oil rig platform.
| Module code and title: | T351, Materials under stress |
|---|---|
| Item code: | T351; 16 |
| First transmission date: | 05-06-1976 |
| Published: | 1976 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:22:58 |
| + Show more... | |
| Producer: | David Nelson |
| Contributors: | David Elliott; Ken Reynolds |
| Publisher: | BBC Open University |
| Keyword(s): | 30-foot circular weld; Production problems; Radiographic test; Testing routines; Ultrasonics |
| Footage description: | Shots of the Graythorpe platform construction yard and shots of a weekly quality control meeting at the yard. Ken Reynolds introduces the programme. Shots of the quality control meeting. A serious fault has been found; cracking in a butt weld of one of the major sections of the platform. The meeting is concerned with how the crack was discovered and with the extent of the cracking. Ken Reynolds and Fred Watson, on the rig, examine a butt weld seam similar to that discussed at the meeting above. Watson explains why ultrasonic tests revealed more of the sub surface cracks than did gamma radiography. He goes on to explain what sorts of defects are shown up best by gamma radiography. Douglas Breeze explains to Reynolds how, during ultrasonic testing, the validity of an operator's readings are checked and how the quality control team tries to ensure that a uniform standard is met. The meeting goes on to discuss the possibility that other welds on the rig may suffer similar defects. They look at the evidence collected so far. The meeting then discusses some possible reasons for cracks in the large butt welds. Ken Reynolds sums up the problem. The meeting goes on to examine possible method which may be used to discover the extent of the problem. Film shots of a completed rig (similar to the one being constructed above) being towed to sea and fixed in place. Ken Reynolds (voice over) explains how the towing operation is carried out and then points out some of the problems a platform faces during its service life. Reynolds begins a discussion on possible methods of checking the platform structure for cracks once it is in place. Film shots of divers at work. Reynolds goes on to describe acoustic emission, a technique not yet in use, which may one day be used to monitor such structures. He demonstrates the technique using experimental apparatus at the yard. A high tensile steel bolt is tested to destruction and its acoustic emissions monitored. Reynolds sums up by describing some of the limitations of this method. Credits. Postcript: film shots of the completed rig being towed to sea (31-7-1976) and fixed in place (10-8-1976). ' |
| Master spool number: | 6HT/72151 |
| Production number: | 00525_5267 |
| Videofinder number: | 1427 |
| Available to public: | no |
