Section 155 in The Petroleum And Natural Gas (Safety In Offshore Operations) Rules, 2008
155. Classification .-(1) The systems and equipment of facilities shall be classified with regard to the health, safety and environment related consequences of potential functional failures.
(2)With regard to functional failures that may entail serious consequences, the different fault modes with associated failure causes and failure mechanisms shall be identified, and the failure probability in respect of the individual fault mode shall be estimated.(3)The classification shall constitute the basis for choice of maintenance activities, maintenance frequency and for the priority of different maintenance activities.
