Non-intrusive examination

Unlike metals, which respond to various techniques, there are no methods of determining conditions of the fluoropolymer lining from the outside. This remains a major limitation in the use of fluo-ropolymers to replace metals. Initiatives are under way to address this gap at the research and development level. 

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Visual and other non-intrusive examinations are an essential part of maintenance. This typically begins with an inspection plan that outlines the type and frequency of inspection. The anticipated damage mechanism and the probability determine the type of inspection. The frequency is determined by the consequences associated with the damage. The consequences and the probability together constitute the risk-based inspection (RBI) strategy. 

Broadly speaking, there are two categories of inspections. One is visual or assisted visual and the other is nondestmctive examination. Where any of these examinations can be carried out with direct access to the surface and without shutting down the unit, the broad term non-intrusive examination is applied. 

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