  In this paper we compute asymptotics for the coefficients of an infinite
class of overpartition rank generating functions. Using these results, we show
that $ \overline{N}(a,c,n), $ the number of overpartitions of $ n $ with rank
congruent to $ a $ modulo $ c, $ is equidistributed with respect to $ 0\le a<
c, $ for any $ c\ge2, $ as $ n\to\infty $ and, in addition, we prove some
inequalities between ranks of overpartitions conjectured by Ji, Zhang and Zhao
(2018), and Wei and Zhang (2018) for $ n=6 $ and $ n=10. $
