EN ISO 6338:2026 PDF

Overview

EN ISO 6338:2026, titled "Method to calculate GHG emissions at LNG plant (ISO 6338:2023)," is the authoritative international standard developed by CEN for greenhouse gas (GHG) emissions calculation at liquefied natural gas (LNG) liquefaction plants. This document specifies a robust, standardized methodology for quantifying GHG emissions from onshore and offshore LNG plants, covering the full operational scope from the inlet flange of the inlet facilities to the offloading arms used for truck, ship, or railcar loading.

The standard aims to meet the growing demand for clear, auditable reporting of GHG emissions in the LNG industry, facilitating accurate carbon footprint assessments and supporting environmental compliance and sustainability initiatives.

Key Topics

• Operational Boundaries: EN ISO 6338:2026 covers all facilities and processes associated with LNG production, including:
  • Reception facilities
  • Condensate units (when applicable)
  • Pre-treatment operations (acid gas removal, dehydration, mercury and heavies removal)
  • LPG extraction and fractionation
  • Core liquefaction and storage units
  • LNG loading operations
  • Boil-Off-Gas handling, flare and disposal systems
  • Utilities (imported electricity, onsite generation, and supporting infrastructure)
• Emission Sources: The standard accounts for all major GHG emission sources, such as:
  • Fuel combustion
  • Flaring and venting
  • Process and cold vents, including fugitive leaks
  • Imported energy consumption
  • Emissions related to Boil-Off-Gas management during loading operations
• Allocation and Reporting:
  • Methods for allocating GHG emissions between LNG and other byproducts (e.g., LPG, domestic gas, condensate, sulphur)
  • Preferred measurement units and conversion factors
  • Recommendations on instrumentation and estimation methods
  • Requirements for GHG inventory quality assurance and transparent reporting
• Exclusions: The construction, commissioning, extension, and decommissioning phases of LNG plants are excluded from detailed quantification, though may be considered separately.

Applications

EN ISO 6338:2026 has practical value across the natural gas and LNG sectors:

• Operational GHG Accounting: Enables LNG plant operators to systematically monitor, quantify, and report their greenhouse gas emissions under well-defined boundaries and scopes.
• Regulatory Compliance: Assists organizations in meeting international and regional environmental requirements, emission reporting, and sustainability targets.
• Carbon Footprint Management: Provides a standardized, auditable method for determining the carbon footprint of LNG production, facilitating comparison and benchmarking both within and between organizations.
• Emission Reduction Strategies: By identifying and accurately quantifying all emissions sources, plant operators can better target emission reduction initiatives and track progress over time.
• Market Demand and Offsetting: Satisfies emerging demands for verifiable GHG data, supporting participation in carbon trading and carbon offset programs.

Related Standards

For comprehensive environmental management and greenhouse gas quantification, the following standards are relevant:

• ISO 14044: Environmental management - Life cycle assessment - Requirements and guidelines
• ISO 14064-1: Greenhouse gases - Specification with guidance at the organization level for quantification and reporting of greenhouse gas emissions and removals
• API Consistent Methodology for Estimating Greenhouse Gas Emissions from LNG Operations

These standards offer complementary frameworks for life cycle analysis, GHG quantification, and environmental reporting, ensuring broad applicability and consistency across sectors.

Keywords: EN ISO 6338, LNG plant GHG emissions, GHG calculation methodology, LNG carbon footprint, natural gas liquefaction, emissions reporting, environmental compliance, sustainability, CEN standards.