Section 207(c) in The Tamil Nadu Building and other Construction Workers (Regulation of Employment and Conditions of Service) Rules, 2006
(c)every pressure plant or equipment shall be thoroughly examined by the competent person,-(i)externally, once in every period of 6 months;(ii)internally, once in every period of 12 months; and(iii)by hydraulic test once in a period of 4 years.
