Abstract
This paper describes the rig used for the full-scale fatigue testing of an oilfield production riser connection. The complex block-loading spectrum and the need to co-ordinate data acquisition with the loading made a real-time, computer-based control system an attractive, perhaps an essential, solution. It is seen that in the integrated system of electronics, servohydraulics and rig hardware, the computer functioned as a man/machine interface. Aspects of safety to which the computer contributed are highlighted, but the importance of electro-mechanical devices is also recognized. It was found that a multiple checking technique was a valuable tool in avoiding nuisance tripping of the safety circuit. Finally, the main advantages of the computer-based control system are summarized.
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