Section 2(1)(cc) in Petroleum and Natural Gas Regulatory Board (Technical Standards and Specifications including Safety Standards for Liquefied Natural Gas Facilities) Regulations, 2018
(cc)"primary components" include those whose failure would permit leakage of the LNG being stored, those exposed to a temperature between (-510C) and (-1680C) and those subject to thermal shock but shall not be limited to the following parts of a single-wall tank or of the inner tank in a double-wall tank, namely, shell plates, bottom plates, roof plates, knuckle plates, compression rings, shell stiffeners, manways, and nozzles including reinforcement, shell anchors, pipe tubing, forging, and bolting. These are the parts of LNG containers that are stressed to a significant level;