Abstract
Condition assessment of Prestressed Concrete Pressure Pipe (PCCP) has evolved over the past 10 years mainly due to the development of the Remote Field Eddy Current / Transformer Coupling (RFEC/TC) inspection technique. By conducting RFEC/TC inspections to determine the actual condition of their pipelines PCCP owners and operators can make informed decisions regarding strategic repairs and selective rehabilitation. However, RFEC/TC inspections can, in some circumstances, be a challenge to conduct. Various designs of manned tools and tethered systems have been successfully used in the field but they require dewatering and/or depressurizing which can be costly and prevent the inspection of pipelines that can not be taken out of the service. To overcome these challenges a free-swimming tool for RFEC/TC inspection of PCCP in a live operating environment is currently being developed. This paper describes practical engineering considerations for such a development.
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