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Displaying records 329 through 329 of 2180
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Title: Cable-operated and self-contained ultrasonic pigs
Category: Pigsource Papers
Downloadable: Yes 
Catalog No.: pg3076e
Date of Publication: 1991
Price: $25.00 US
Authors: A Met, J A de Raad, R van Agthoven
Abstract: In order to establish the integrity of ageing pipelines, intelligent pigging has become of increasing interest. For several decades, pigs using magnetic stray flux were the only tools available for this purpose on the market. The need for more accurate tools was an incentive to develop ultrasonic systems to measure metal loss. This paper provides an overview of special ultrasonic pigging systems and methods. Conventional cable-operated ultrasonic field-proven tools for distances up to 2000m are described, as well as those using long glass-fibre cables up to 6000m in length. Such tools can be propelled either by reversible wheel-driven crawlers, or by differential pressure, as applied for self-contained intelligent pig propulsion. Self-contained liquid-propelled intelligent pigs are used for on-stream inspection of pipelines; a field-tested system (RPIT) to inspect riser pipes is also described.
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