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Title: Tethered Inspection Vehicles for Ferrous Pipelines
Category: Pipeline Industries Guild technical library
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: PIG0195
Date of Publication: October 19, 1994
Price: $25.00 US
Authors: B.J. Smith
Abstract: The British Gas Distribution system comprises around 420,000km of mains and services at low and medium pressures (75 mbar and 2 bar). Of this, around 230,000km is classified as distribution mains. The mains system has been developed over a period of more than 100 years, and is composed of cast iron, ductile iron, steel and polyethylene pipe. The relative amount of each changes continuously as the system is extended, repaired and replaced.
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