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Minutes of the General Meeting held on 09 April 2002 at The Hilton Tree Tops Hotel, 161 Springfield Road, Aberdeen.

Persons present

Clive Tuck (Chairman) Langley Alloys, Meighs Ltd
Phil Dent Bodycote
Patrick Hall MoD
Xinming Hu Heriot Watt University
Roddy James CorrOcean
Manfred Jasner KME
Iain Kennedy QinetiQ
Phillip Ligertwood CorrOcean
John Middleton CorrOcean
Carol Powell CDA
Tracy Reid Amerada Hess
Myrna Reyes Heriot Watt University
Kevin Waterton CAPCIS

By Invitation

Bill Inglis Tungum Hydraulics
Ken Farrow Materials Engineering
Michael Donnelly ABB Offshore Systems
Oliver Mason ABB Offshore Systems
James McDonald EM & I Marine Ltd
Gordon MacDonald Babtie
Linda Gunn Halliburton

The Chairman (Clive Tuck) opened the meeting, but, as he was also one of the Speakers, the meeting was jointly chaired by Clive and Patrick Hall (MoD).

1. Apologies

Paul Badalek BP
Ian Bradley Oil States Industries
Robert Wood Southampton University
John Fowler Rolls Royce
GC Grim Materials and Corrosion Protection Ltd
Len Phillips Weir Pumps
Robert Akid (guest) Sheffield Hallam University
Stuart Bond TWI
Barry Torrance Aish Technologies
Keith Stokes DSTL
Roger Francis Weir Materials
Daley Lasebikan Oil States Industries
David Howarth Lloyds Register
Bill Nimmo NPL
Wayne Pearce Magnox
Steve Plant (guest) TorchIIS
Chris Baxter AvestaPolarit
Steve McCoy Special Metals
John Martin (guest) BP
Jagath Mawella MoD
Robin Oakley QinetiQ
Jean Tuck MCC

2. Technical Presentations (part 1)

2.1 'Tungum Alloy (Tubing) `An Old-fashioned Material in a Modern World, Bill Inglis (Tungum Hydraulics Ltd.).

2.2 'Recent developments in the use of high strength cupro-nickel alloys in off-shore engineering''', Clive Tuck (Langley Alloys, Meighs Ltd.).

3.  Open Forum 

3.1  'Effect of Residual O2 Levels on Corrosion in Sea Water Injection Systems',  Kevin Waterton, CAPCIS Ltd.

 CAPCIS Ltd. is currently undertaking a test programme for BP Exploration Operating Company Ltd. and Statoil at their Marine Test Facility, Holyhead, Anglesey.  The facility comprises a 1,000 sq. m coastal site with unlimited supplies of fresh seawater that may be subject to filtration, chlorination and deaeration.  Tests may be remotely operated and monitored whilst local technical staff enable frequent or even daily attention.  Atmospheric exposure and real time natural weathering is also possible, for which review of meteorological data has shown the conditions to compare favourably to those existing offshore in the North Sea. 

The sea water corrosion testing facilities have been used to evaluate metallic, lined and coated tubular systems, primarily for seawater injection for enhanced oil recovery under flowing conditions but could easily be adapted for testing materials for ships' piping and cooling systems, etc.  Tests may also be carried out under static and spray conditions.  Located within the Holyhead Ferryport, the site is secure.

 The objective of the current programme is to determine the corrosion of low alloy steels, stainless steels and CRAs in flowing and stagnant seawater with O2 levels representative of well and poorly controlled deaeration systems.  The materials under investigation include L80 carbon steel, 1Cr, 3Cr, 13Cr, 13 super CR, 22Cr, 25Cr, 316, 17-4 PH and 718 alloy; electroless nickel plated L80.  The results will provide better guidance for materials selection for downhole tubing and flowlines.

Fresh seawater is deaerated to three levels using nitrogen stripping and oxygen scavengers and pumped past the ring test specimens in four flow loops at 5ms-1 (25m3hr-1) in accordance with the test matrix below.  Stagnant conditions have been generated by closing in one arm of each loop and dosing with yeast to promote development of a biofilm at the sample surface.  After 2 weeks the valves of the stagnant arms were cracked open slightly to allow a very slow trickle of sea water to supply nutrients for continued growth of the biofilm.

  SEAWATER INJECTION 25 30C SEAWATER/PRODUCED WATER INJECTION     55 60C, CO2 to pH 5-6 HIGH O2 EXCURSION ~1500ppb
WELL CONTROLLED 20ppb O2 20ppb O2 3 HOURS/ WEEK
POORLY CONTROLLED 200ppb O2 200ppb O2 3 HOURS/DAY

Data is collected automatically for the temperature of each loop, pH of 60?C flow loops with CO2 and the O2 level of deaerated seawater.  The potentials of galvanic couples in flowing sections are also monitored. The tests will continue for 20 weeks before evaluation of the samples.

 3.2      Aberdeen meetings  

Two questions were asked about future Aberdeen MCC meetings.  The first related to the current situation regarding the Institute of Corrosion Aberdeen branch.  It was felt that the ICorr Aberdeen branch is still not functioning to any degree, thus it is unlikely to be organising evening events next year, which could link with the 2003 MCC meeting. [Note:  A programme for the Aberdeen ICorr relaunch has since been circulated so this situation will be monitored - JT].

The second was about the time and venue.  It was noted that the planned meeting for next year was due to take place at the Aberdeen Hilton Hotel on the afternoon of Tuesday 8th April 2003.  This was generally felt to be a suitable venue and time of day for the meeting.  It was also noted that, unlike the 2002 MCC Aberdeen meeting, the date chosen for 2003 did not clash with the NACE Spring meeting. 

 4. Technical Presentations (part 2):

 4.1  'Erosion-corrosion of materials for drill bits offshore', Myrna Reyes & Anne Neville (Corrosion and Surface Engineering Research Group, Department of Mechanical and Chemical Engineering, Heriot Watt University)

 4.2  'Corrosion and cracking effects on the structural safety of ships', Iain Kennedy (Marine Structures, QinetiQ, Rosyth)

The Chairman closed the meeting at approx. 5:00 pm


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