In downstream oil and gas, LPG: a document approved by a recognized body, that provides, for common and repeated use, rules, guidelines, or characteristics for products, or related processes and production methods, with which compliance is not mandatory [Section 3.54, 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]
