Product category:
Materials and components
News Release from: BAC Corrosion Control
Edited by the Engineeringtalk Editorial
Team on 10 May 2002
Northumbrian refurbishment nears
completion
BAC Corrosion Control has begun the final phase of the Northumbrian Water (NWL) refurbishment contract.
BAC Corrosion Control has begun the final phase of the Northumbrian Water (NWL) refurbishment contract This entails minor civil works, testing, commissioning, interference testing and completion of technical documentary requirements
This article was originally published on Engineeringtalk on 20 Feb 2001 at 8.00am (UK)
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The contract started some 3 years ago with a desktop study of buried steel water mains from the Scottish border down to the River Tees in County Cleveland.
Working closely with NWL asset managers and utility survey teams, buried steel mains were identified and assessed for refurbishment.
The mains were prioritised utilising a custom made criticality matrix: the major factors of the matrix being third party interaction, SSSI (environmental considerations), leak history, soil corrosivity industrial/domestic use, alternative supply route, access difficulties and finally, expenditure.
Steel mains ranging from 200 to 1200mm diameter with a combined length 450km were identified and cathodic protection (CP) requirements re-assessed, designed and implemented.
Both impressed current (ICCP) and galvanic anode CP systems have been used to provide protection to the steel mains, dependant upon factors pertinent to the specific main.
Selection also involved assessment of third party owned facilities whereby interaction had to be kept to an absolute minimum.
Transco has a vast array of HP gas mains in the industrial area along the River Tees so BAC has kept in close contact throughout the construction phases to ensure intercompany harmony.
Railtrack's fears of electrical interference with signalling systems were alleviated after a full and detailed testing programme indicated that no adverse affects would occur to the train signalling systems at maximum CP system outputs.
The final test for interference is with Huntsman Chemicals and BP on the TSEP ethylene pipeline.
Judging by the early co-operation between NWL/BAC and BP then the same successful outcome is expected.
With continued monitoring and maintenance, the investment made over the last 3 years is likely to be paid back many times with diminishing costly leaks due to corrosion.
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