Discussion on Papers 12–13

MR R. McEWAN, Shell UK Exploration and Production

Can the Authors of Paper 12 comment on the problems arising from the presence of sulphate reducing bacteria (SRB) at water/hydrocarbon interfaces on concrete structures?

Regarding the inspection and maintenance of steel structures offshore, would the Author of Paper 13 confirm that a good record is develop ing of the integrity of behaviour of welded tu bular steel and other structures? In my experi ence, a very high percentage of defects identi fied during planned maintenance and inspection programmes have been defects built in during the construction/fabrication stage.

MR D. KERR, Sir Robert McAlpine and Sons Ltd