Instrumentation • Computing • Control
Advances in porosity testing solutions
E
Peter Ho reports on safer and more efficient porosity testing on offshore structures and pipelines.
nsuring the long-term protection of parts exposed to the extremely harsh conditions found in offshore environments requires intact anti-corrosion protective coatings. Any void, gap or pore in the coatings
can considerably shorten the lifetime of protected components. To control the quality of these crucial coatings, porosity testing is mandatory. All offshore structures – ships, oil rigs, cranes, containers and pipelines (including fittings and valves) are surface coated to shield them from the severe environmental conditions found at sea. As even a tiny pinhole can spoil the protective function, it is necessary to rigorously inspect the coating for integrity. However, even the most careful
visual observation still cannot detect all the pores, cracks and thin spots (less than specified thickness) that can form during the coating process. High- voltage porosity testing is the only truly reliable way to inspect the protective coatings on all kinds of offshore structures; the device commonly used for this is often referred to as a ‘holiday detector’. To conduct this important task, Helmut-Fischer
has developed a comprehensive range of instruments that meet the safety requirements of ISO 2746, with Fischer Instrumentation (GB) supplying and servicing in the UK. Te Poroscope porosity testing range is specifically designed to fulfil the requirements for coating inspection in offshore environments. Features such as the display of the
Fig. 1. Virtually all metal structure in offshore use wear a protective coating that needs to be inspected to ensure that it can withstand the extreme conditions.
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