No.3 CASESTUDY
Separator TESTIMONIAL " Denholm did a fantastic job on that separator, beleive me. We are all delighted with the outcome " Shutdown Co- ordinator
SCOTT PLATFORM
OVERVIEW The project was the decontamination using Zyme-Flow® UN657, of the V0106 Telford Separator on the CNOCC, Scott platform in the North Sea UK Sector. CHALLENGES Previous cleans of the vessel had shown the main issues to be high solids & sludge and high LEL. A secondary consideration was the need for a small equipment footprint and low manning levels as bed space is at a premium in offshore installations. Also, chemicals used needed to meet safety and environmental requirements. PAST PROCEDURE Previous decontaminations employed N2 purging as a means of removing LEL and H2S. This has given inconsistent results and has proved difficult and time consuming to remove the contaminants. It was also almost impossible to accurately estimate the duration Denholm carried out a site survey to determine the best method of achieving decontamination and advised a boil out procedure. The Method Statement was subsequently written to allow maximum flexibility and alternatives should this be required during processing. of the purging process. DECON SOLUTION enquiries@denholm-macnamee.com Tel: + 44 (0) 1467 629 933
RESULTS The client was pleased that the boil-out process had clearly proven the chemical capability and the level of success that can be attained. The % LEL in the vessel before decontamination was fully addressed and all internal surfaces were very clean upon manned entry without the need for N2. The process was completed in 12 hours with an additional 6 hour heating up time. Residual solids were de-oiled and their removal was significantly quicker and easier than with previous cleans. The project was completed within the decon window allocated without accident, injury or near miss. The client TAR Manager was very pleased with the decontamination performance and indicated that the completion of the overall TAR within the scheduled time frame was signiificantly helped by the efficiency and success of the Zyme- Flow® decontamination which gave rapid access to the vessels for inspection and maintenance. Due to the vessel sparge line being inoperative steam was injected at various points along the base of the vessel to try and achieve steam distribution along the full length of the separator thereby providing agitation of the sludge within the separator.
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