Small-Bore FAC Programs in the United States

Topic :

Flow Accelerated Corrosion
Wall thinning management

ABSTRACT :

In contrast to large-bore FAC programs, small-bore programs FAC programs are relatively unsophisticated.  Computer programs are not normally used to help select inspection locations, inspection techniques are not as well developed as for large-bore, pipe runs are long and experience substantial pressure drop. Further, the large change of properties consistent with the pressure changes along the line and the presences of socket welded fittings complicate the evaluation process. 

Despite the best efforts of utility engineers in the last 20 years, leaks and ruptures continue to occur.  To assist utilities dealing with this issue, the CHECWORKSä Users Group (CHUG) has recently issued a position paper on small bore piping.  This document details approaches to small-bore FAC including: identifying FAC susceptible systems, prioritizing lines for inspection, selecting inspection locations, and performing inspections.  Both short and long term strategies for dealing with FAC in small-bore systems are also discussed.