NF ISO 6338-1, M51-014-1 (02/2024)

This document: — provides general information on the method for calculating greenhouse gas (GHG) emissions in the liquefied natural gas (LNG) chain, a means of determining their carbon footprint; — defines the preferred units of measurement and the necessary conversions; — recommends instrumentation and estimation methods to monitor and report GHG emissions. Some emissions are measured and others estimated. This document covers all installations in the LNG chain. Facilities are considered to be “in operation”, this includes emissions associated with commissioning, initial start-up, maintenance, overhaul and restarts following maintenance or disruption. The construction, commissioning, extension and abandonment phases are excluded, but can be assessed separately. This document covers all GHG emissions. These emissions are divided into category 1, category 2 and category 3 of the responsible organization. Categories 1, 2 and 3 are defined in this document. All emission sources are covered, including flaring, combustion, cold vents, process vents, fugitive leaks, and emissions associated with imported energy. This document describes the allocation of GHG emissions to LNG and other hydrocarbon products when other products are produced (e.g. LPG, domestic gas, condensates, sulfur, etc.). This document does not cover specific requirements for production, transportation to the LNG plant, liquefaction, shipping and regasification. This document is applicable to the LNG industry.
(Automatic translation from French)