Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Reexamination Certificate
2005-08-30
2005-08-30
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
C324S533000
Reexamination Certificate
active
06937030
ABSTRACT:
Method is provided for testing electrically heated subsea pipelines that are “electrical-ready,” that is, equipped for applying electrical power when it is needed for heating the pipeline at any time during the life of the pipeline. Time domain reflectometer apparatus in a water-tight enclosure can be deployed subsea. Electrical connections are made with the pipeline using wet-mateable connectors. Reflected signals from the segment of the pipeline being tested are transmitted to an interface at the surface, where the time domain reflectometer is controlled to send a selected pulse. Reflected signals may be interpreted by observing pulse form and time of receipt or by comparison of pulse forms received at different times during the life of a pipeline. Apparatus for electrically connecting a time domain reflectometer to an electrical-ready pipeline is provided.
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March David M.
Deb Anjan
He Amy
Hickman William E.
Shell Oil Company
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