In downstream oil and gas, LPG: operation in which two or more parts are united by means of heat, friction, pressure, or all three of these in such a way that there is continuity in the nature of the metal between these parts (footnote 31: ISO 15653: 2018) [Section 3.68, Rule 3, DTI Department Administrative Order No. 22-11, Series of 2022, The New Technical Regulation Concerning the Mandatory Certification of Liquefied Petroleum Gas (LPG) Pressure Vessels, Systems, Services and Ancillary Products]
